// Copyright (C) 2022-2026 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#include <config.h>

#include <cstdlib>

#include <asiolink/addr_utilities.h>
#include <database/database_connection.h>
#include <database/db_exceptions.h>
#include <database/server.h>
#include <database/testutils/schema.h>
#include <dhcp/libdhcp++.h>
#include <dhcp/option6_addrlst.h>
#include <dhcp/option_int.h>
#include <dhcp/option_space.h>
#include <dhcp/option_string.h>
#include <dhcpsrv/cfgmgr.h>
#include <dhcpsrv/client_class_def.h>
#include <dhcpsrv/config_backend_dhcp6_mgr.h>
#include <dhcpsrv/parsers/dhcp_parsers.h>
#include <dhcpsrv/pool.h>
#include <dhcpsrv/subnet.h>
#include <dhcpsrv/testutils/generic_cb_dhcp6_unittest.h>
#include <dhcpsrv/testutils/test_utils.h>
#include <testutils/gtest_utils.h>

#include <boost/make_shared.hpp>
#include <boost/shared_ptr.hpp>
#include <gtest/gtest.h>

using namespace isc;
using namespace isc::util;
using namespace isc::asiolink;
using namespace isc::db;
using namespace isc::db::test;
using namespace isc::data;
using namespace isc::dhcp;
using namespace isc::dhcp::test;
using namespace isc::process;
using namespace isc::test;
namespace ph = std::placeholders;

void
GenericConfigBackendDHCPv6Test::SetUp() {
    CfgMgr::instance().setFamily(AF_INET6);

    // Ensure we have the proper schema with no transient data.
    createSchema();

    try {
        // Create a connection parameter map and use it to start the backend.
        DatabaseConnection::ParameterMap params =
            DatabaseConnection::parse(validConnectionString());
        cbptr_ = backendFactory(params);
    } catch (...) {
        std::cerr << "*** ERROR: unable to open database. The test\n"
                     "*** environment is broken and must be fixed before\n"
                     "*** the tests will run correctly.\n"
                     "*** The reason for the problem is described in the\n"
                     "*** accompanying exception output.\n";
        throw;
    }

    // Create test data.
    initTestServers();
    initTestOptions();
    initTestSubnets();
    initTestSharedNetworks();
    initTestOptionDefs();
    initTestClientClasses();
}

void
GenericConfigBackendDHCPv6Test::TearDown() {
    cbptr_.reset();
    // If data wipe enabled, delete transient data otherwise destroy the schema.
    if (getenv("KEA_UNIT_TEST_KEEP_SCHEMA")) {
        std::cout << "KEA_UNIT_TEST_KEEP_SCHEMA set, avoid schema destruction" << std::endl;
    } else {
        destroySchema();
    }
}

db::AuditEntryCollection
GenericConfigBackendDHCPv6Test::getRecentAuditEntries(const db::ServerSelector& server_selector,
                                                      const boost::posix_time::ptime& modification_time,
                                                      const uint64_t& modification_id) const {
    return (cbptr_->getRecentAuditEntries(server_selector, modification_time, modification_id));
}

void
GenericConfigBackendDHCPv6Test::initTestServers() {
    test_servers_.push_back(Server::create(ServerTag("server1"), "this is server 1"));
    test_servers_.push_back(Server::create(ServerTag("server1"), "this is server 1 bis"));
    test_servers_.push_back(Server::create(ServerTag("server2"), "this is server 2"));
    test_servers_.push_back(Server::create(ServerTag("server3"), "this is server 3"));
}

void
GenericConfigBackendDHCPv6Test::initTestSubnets() {
    // First subnet includes all parameters.
    std::string interface_id_text = "whale";
    OptionBuffer interface_id(interface_id_text.begin(), interface_id_text.end());
    OptionPtr opt_interface_id(new Option(Option::V6, D6O_INTERFACE_ID,
                                          interface_id));
    ElementPtr user_context = Element::createMap();
    user_context->set("foo", Element::create("bar"));

    Subnet6Ptr subnet(new Subnet6(IOAddress("2001:db8::"), 64,
                                  30, 40, 50, 60, 1024));
    subnet->allowClientClass("home");
    subnet->allowClientClass("office");
    subnet->setIface("eth1");
    subnet->setInterfaceId(opt_interface_id);
    subnet->setT2(323212);
    subnet->addRelayAddress(IOAddress("2001:db8:1::2"));
    subnet->addRelayAddress(IOAddress("2001:db8:3::4"));
    subnet->setT1(1234);
    subnet->addAdditionalClass("required-class1");
    subnet->addAdditionalClass("required-class2");
    subnet->setReservationsGlobal(false);
    subnet->setReservationsInSubnet(false);
    subnet->setContext(user_context);
    subnet->setValid(555555);
    subnet->setPreferred(4444444);
    subnet->setCalculateTeeTimes(true);
    subnet->setT1Percent(0.345);
    subnet->setT2Percent(0.444);
    subnet->setDdnsSendUpdates(false);
    subnet->setAllocatorType("random");
    subnet->setPdAllocatorType("iterative");
    subnet->setDdnsTtl(880);

    Pool6Ptr pool1(new Pool6(Lease::TYPE_NA,
                             IOAddress("2001:db8::10"),
                             IOAddress("2001:db8::20")));
    subnet->addPool(pool1);

    Pool6Ptr pool2(new Pool6(Lease::TYPE_NA,
                             IOAddress("2001:db8::50"),
                             IOAddress("2001:db8::60")));
    subnet->addPool(pool2);

    Pool6Ptr pdpool1(new Pool6(Lease::TYPE_PD,
                               IOAddress("2001:db8:a::"), 48, 64));
    subnet->addPool(pdpool1);

    Pool6Ptr pdpool2(new Pool6(Lease::TYPE_PD,
                               IOAddress("2001:db8:b::"), 48, 64));
    subnet->addPool(pdpool2);

    // Add several options to the subnet.
    subnet->getCfgOption()->add(*test_options_[0], test_options_[0]->space_name_);
    subnet->getCfgOption()->add(*test_options_[1], test_options_[1]->space_name_);
    subnet->getCfgOption()->add(*test_options_[2], test_options_[2]->space_name_);

    test_subnets_.push_back(subnet);

    // Adding another subnet with the same subnet id to test
    // cases that this second instance can override existing
    // subnet instance.
    subnet.reset(new Subnet6(IOAddress("2001:db8:1::"),
                             48, 20, 30, 40, 50, 1024));

    pool1.reset(new Pool6(Lease::TYPE_NA,
                          IOAddress("2001:db8:1::10"),
                          IOAddress("2001:db8:1::20")));
    subnet->addPool(pool1);

    pool1->getCfgOption()->add(*test_options_[3], test_options_[3]->space_name_);
    pool1->getCfgOption()->add(*test_options_[4], test_options_[4]->space_name_);

    pool2.reset(new Pool6(Lease::TYPE_NA,
                          IOAddress("2001:db8:1::50"),
                          IOAddress("2001:db8:1::60")));
    subnet->addPool(pool2);

    pool2->allowClientClass("work");
    pool2->allowClientClass("play");
    pool2->addAdditionalClass("required-class3");
    pool2->addAdditionalClass("required-class4");
    user_context = Element::createMap();
    user_context->set("bar", Element::create("foo"));
    pool2->setContext(user_context);
    pdpool1.reset(new Pool6(IOAddress("2001:db8:c::"), 48, 64,
                            IOAddress("2001:db8:c::1"), 96));
    subnet->addPool(pdpool1);

    pdpool1->getCfgOption()->add(*test_options_[3], test_options_[3]->space_name_);
    pdpool1->getCfgOption()->add(*test_options_[4], test_options_[4]->space_name_);

    // Create the prefix delegation pool with an excluded prefix.
    pdpool2.reset(new Pool6(IOAddress("2001:db8:d::"), 48, 64,
                            IOAddress("2001:db8:d::2000"), 120));

    subnet->addPool(pdpool2);

    pdpool2->allowClientClass("work");
    pdpool2->addAdditionalClass("required-class3");
    pdpool2->addAdditionalClass("required-class4");
    user_context = Element::createMap();
    user_context->set("bar", Element::create("foo"));
    pdpool2->setContext(user_context);

    test_subnets_.push_back(subnet);

    subnet.reset(new Subnet6(IOAddress("2001:db8:3::"), 64, 20, 30, 40, 50, 2048));
    Triplet<uint32_t> null_timer;
    subnet->setPreferred(null_timer);
    subnet->setT1(null_timer);
    subnet->setT2(null_timer);
    subnet->setValid(null_timer);
    subnet->setPreferred(null_timer);
    subnet->setDdnsSendUpdates(true);
    subnet->setDdnsOverrideNoUpdate(true);
    subnet->setDdnsOverrideClientUpdate(false);
    subnet->setDdnsReplaceClientNameMode(D2ClientConfig::ReplaceClientNameMode::RCM_WHEN_PRESENT);
    subnet->setDdnsGeneratedPrefix("myhost");
    subnet->setDdnsQualifyingSuffix("example.org");
    subnet->setDdnsTtlPercent(0.50);
    subnet->setDdnsTtlMin(300);
    subnet->setDdnsTtlMax(700);

    subnet->getCfgOption()->add(*test_options_[0], test_options_[0]->space_name_);

    test_subnets_.push_back(subnet);

    // Add a subnet with all defaults.
    subnet.reset(new Subnet6(IOAddress("2001:db8:4::"), 64,
                             Triplet<uint32_t>(), Triplet<uint32_t>(),
                             Triplet<uint32_t>(), Triplet<uint32_t>(),
                             4096));
    test_subnets_.push_back(subnet);
}

void
GenericConfigBackendDHCPv6Test::initTestSharedNetworks() {
    ElementPtr user_context = Element::createMap();
    user_context->set("foo", Element::create("bar"));

    std::string interface_id_text = "fish";
    OptionBuffer interface_id(interface_id_text.begin(), interface_id_text.end());
    OptionPtr opt_interface_id(new Option(Option::V6, D6O_INTERFACE_ID, interface_id));

    SharedNetwork6Ptr shared_network(new SharedNetwork6("level1"));
    shared_network->allowClientClass("foo");
    shared_network->setIface("eth1");
    shared_network->setInterfaceId(opt_interface_id);
    shared_network->setT2(323212);
    shared_network->addRelayAddress(IOAddress("2001:db8:1::2"));
    shared_network->addRelayAddress(IOAddress("2001:db8:3::4"));
    shared_network->setT1(1234);
    shared_network->addAdditionalClass("required-class1");
    shared_network->addAdditionalClass("required-class2");
    shared_network->setReservationsGlobal(false);
    shared_network->setReservationsInSubnet(false);
    shared_network->setContext(user_context);
    shared_network->setValid(5555);
    shared_network->setPreferred(4444);
    shared_network->setCalculateTeeTimes(true);
    shared_network->setT1Percent(0.345);
    shared_network->setT2Percent(0.444);
    shared_network->setDdnsSendUpdates(false);
    shared_network->setAllocatorType("iterative");
    shared_network->setPdAllocatorType("random");
    shared_network->setDdnsTtlPercent(0.70);
    shared_network->setDdnsTtlMin(200);
    shared_network->setDdnsTtlMax(800);

    // Add several options to the shared network.
    shared_network->getCfgOption()->add(*test_options_[2], test_options_[2]->space_name_);
    shared_network->getCfgOption()->add(*test_options_[3], test_options_[3]->space_name_);
    shared_network->getCfgOption()->add(*test_options_[4], test_options_[4]->space_name_);

    test_networks_.push_back(shared_network);

    // Adding another shared network called "level1" to test
    // cases that this second instance can override existing
    // "level1" instance.
    shared_network.reset(new SharedNetwork6("level1"));
    test_networks_.push_back(shared_network);

    // Add more shared networks.
    shared_network.reset(new SharedNetwork6("level2"));
    Triplet<uint32_t> null_timer;
    shared_network->setPreferred(null_timer);
    shared_network->setT1(null_timer);
    shared_network->setT2(null_timer);
    shared_network->setValid(null_timer);
    shared_network->setPreferred(null_timer);
    shared_network->setDdnsSendUpdates(true);
    shared_network->setDdnsOverrideNoUpdate(true);
    shared_network->setDdnsOverrideClientUpdate(false);
    shared_network->setDdnsReplaceClientNameMode(D2ClientConfig::ReplaceClientNameMode::RCM_WHEN_PRESENT);
    shared_network->setDdnsGeneratedPrefix("myhost");
    shared_network->setDdnsQualifyingSuffix("example.org");
    shared_network->setDdnsTtl(9000);

    shared_network->getCfgOption()->add(*test_options_[0], test_options_[0]->space_name_);
    test_networks_.push_back(shared_network);

    shared_network.reset(new SharedNetwork6("level3"));
    test_networks_.push_back(shared_network);
}

void
GenericConfigBackendDHCPv6Test::initTestOptionDefs() {
    ElementPtr user_context = Element::createMap();
    user_context->set("foo", Element::create("bar"));

    OptionDefinitionPtr option_def(new OptionDefinition("foo", 1234,
                                                        DHCP6_OPTION_SPACE,
                                                        "string",
                                                        "espace"));
    test_option_defs_.push_back(option_def);

    option_def.reset(new OptionDefinition("bar", 1234, DHCP6_OPTION_SPACE,
                                          "uint32", true));
    test_option_defs_.push_back(option_def);

    option_def.reset(new OptionDefinition("fish", 5235, DHCP6_OPTION_SPACE,
                                          "record", true));
    option_def->addRecordField("uint32");
    option_def->addRecordField("string");
    test_option_defs_.push_back(option_def);

    option_def.reset(new OptionDefinition("whale", 20236, "xyz", "string"));
    test_option_defs_.push_back(option_def);

    option_def.reset(new OptionDefinition("bar", 1234, DHCP6_OPTION_SPACE,
                                          "uint16", true));
    test_option_defs_.push_back(option_def);
}

void
GenericConfigBackendDHCPv6Test::initTestOptions() {
    ElementPtr user_context = Element::createMap();
    user_context->set("foo", Element::create("bar"));

    OptionDefSpaceContainer defs;

    OptionDescriptor desc =
        createOption<OptionString>(Option::V6, D6O_NEW_POSIX_TIMEZONE,
                                   true, false, false, "my-timezone");
    desc.space_name_ = DHCP6_OPTION_SPACE;
    desc.setContext(user_context);
    desc.addClientClass("class1");
    desc.addClientClass("class2");
    test_options_.push_back(OptionDescriptorPtr(new OptionDescriptor(desc)));

    desc = createOption<OptionUint8>(Option::V6, D6O_PREFERENCE,
                                     false, false, true, 64);
    desc.space_name_ = DHCP6_OPTION_SPACE;
    test_options_.push_back(OptionDescriptorPtr(new OptionDescriptor(desc)));

    desc = createOption<OptionUint32>(Option::V6, 1, false, false, false, 312131),
    desc.space_name_ = "vendor-encapsulated-options";
    test_options_.push_back(OptionDescriptorPtr(new OptionDescriptor(desc)));

    desc = createAddressOption<Option6AddrLst>(1254, true, true, true,
                                               "2001:db8::3");
    desc.space_name_ = DHCP6_OPTION_SPACE;
    test_options_.push_back(OptionDescriptorPtr(new OptionDescriptor(desc)));

    desc = createEmptyOption(Option::V6, 1, true, false);
    desc.space_name_ = "isc";
    test_options_.push_back(OptionDescriptorPtr(new OptionDescriptor(desc)));

    desc = createAddressOption<Option6AddrLst>(2, false, false, true,
                                               "2001:db8:1::5",
                                               "2001:db8:1::3",
                                               "2001:db8:3::4");
    desc.space_name_ = "isc";
    test_options_.push_back(OptionDescriptorPtr(new OptionDescriptor(desc)));

    desc = createOption<OptionString>(Option::V6, D6O_NEW_POSIX_TIMEZONE,
                                      true, false, false, "my-timezone-2");
    desc.space_name_ = DHCP6_OPTION_SPACE;
    desc.setContext(user_context);
    test_options_.push_back(OptionDescriptorPtr(new OptionDescriptor(desc)));

    desc = createOption<OptionString>(Option::V6, D6O_NEW_POSIX_TIMEZONE,
                                      true, true, false, "my-timezone-3");
    desc.space_name_ = DHCP6_OPTION_SPACE;
    desc.setContext(user_context);
    desc.addClientClass("class3");
    desc.addClientClass("class4");
    test_options_.push_back(OptionDescriptorPtr(new OptionDescriptor(desc)));

    // Add definitions for DHCPv6 non-standard options in case we need to
    // compare subnets, networks and pools in JSON format. In that case,
    // the @c toElement functions require option definitions to generate the
    // proper output.
    defs.addItem(OptionDefinitionPtr(new OptionDefinition("vendor-encapsulated-1", 1,
                                                          "vendor-encapsulated-options",
                                                          "uint32")));
    defs.addItem(OptionDefinitionPtr(new OptionDefinition("option-1254", 1254,
                                                          DHCP6_OPTION_SPACE,
                                                          "ipv6-address", true)));
    defs.addItem(OptionDefinitionPtr(new OptionDefinition("isc-1", 1, "isc", "empty")));
    defs.addItem(OptionDefinitionPtr(new OptionDefinition("isc-2", 2, "isc",
                                                          "ipv6-address", true)));

    // Register option definitions.
    LibDHCP::setRuntimeOptionDefs(defs);
}

void
GenericConfigBackendDHCPv6Test::initTestClientClasses() {
    ExpressionPtr match_expr = boost::make_shared<Expression>();
    CfgOptionPtr cfg_option = boost::make_shared<CfgOption>();
    auto class1 = boost::make_shared<ClientClassDef>("foo", match_expr, cfg_option);
    class1->setCfgOptionDef(boost::make_shared<CfgOptionDef>());
    class1->setAdditional(true);
    class1->setValid(Triplet<uint32_t>(30, 60, 90));
    class1->setPreferred(Triplet<uint32_t>(25, 55, 85));
    test_client_classes_.push_back(class1);
    ElementPtr user_context = Element::createMap();
    user_context->set("melon", Element::create("water"));
    class1->setContext(user_context);

    auto class2 = boost::make_shared<ClientClassDef>("bar", match_expr, cfg_option);
    class2->setCfgOptionDef(boost::make_shared<CfgOptionDef>());
    class2->setTest("member('foo')");
    test_client_classes_.push_back(class2);

    auto class3 = boost::make_shared<ClientClassDef>("foobar", match_expr, cfg_option);
    class3->setCfgOptionDef(boost::make_shared<CfgOptionDef>());
    class3->setTest("member('foo') and member('bar')");
    test_client_classes_.push_back(class3);
}

void
GenericConfigBackendDHCPv6Test::getTypeTest(const std::string& expected_type) {
    DatabaseConnection::ParameterMap params;
    params["name"] = "keatest";
    params["password"] = "keatest";
    params["user"] = "keatest";
    ASSERT_NO_THROW_LOG(cbptr_ = backendFactory(params));
    ASSERT_NE(cbptr_->getParameters(), DatabaseConnection::ParameterMap());
    EXPECT_EQ(expected_type, cbptr_->getType());
}

void
GenericConfigBackendDHCPv6Test::getHostTest() {
    DatabaseConnection::ParameterMap params;
    params["name"] = "keatest";
    params["password"] = "keatest";
    params["user"] = "keatest";
    ASSERT_NO_THROW_LOG(cbptr_ = backendFactory(params));
    ASSERT_NE(cbptr_->getParameters(), DatabaseConnection::ParameterMap());
    EXPECT_EQ("localhost", cbptr_->getHost());
}

void
GenericConfigBackendDHCPv6Test::getPortTest() {
    DatabaseConnection::ParameterMap params;
    params["name"] = "keatest";
    params["password"] = "keatest";
    params["user"] = "keatest";
    ASSERT_NO_THROW_LOG(cbptr_ = backendFactory(params));
    ASSERT_NE(cbptr_->getParameters(), DatabaseConnection::ParameterMap());
    EXPECT_EQ(0, cbptr_->getPort());
}

void
GenericConfigBackendDHCPv6Test::createUpdateDeleteServerTest() {
    // Explicitly set modification time to make sure that the time
    // returned from the database is correct.
    test_servers_[0]->setModificationTime(timestamps_["yesterday"]);
    test_servers_[1]->setModificationTime(timestamps_["today"]);

    // Insert the server1 into the database.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));

    {
        SCOPED_TRACE("CREATE audit entry for server");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    // It should not be possible to create a duplicate of the logical
    // server 'all'.
    auto all_server = Server::create(ServerTag("all"), "this is logical server all");
    ASSERT_THROW(cbptr_->createUpdateServer6(all_server), isc::InvalidOperation);

    ServerPtr returned_server;

    // An attempt to fetch the server that hasn't been inserted should return
    // a null pointer.
    ASSERT_NO_THROW_LOG(returned_server = cbptr_->getServer6(ServerTag("server2")));
    EXPECT_FALSE(returned_server);

    // Try to fetch the server which we expect to exist.
    ASSERT_NO_THROW_LOG(returned_server = cbptr_->getServer6(ServerTag("server1")));
    ASSERT_TRUE(returned_server);
    EXPECT_EQ("server1", returned_server->getServerTagAsText());
    EXPECT_EQ("this is server 1", returned_server->getDescription());
    EXPECT_EQ(timestamps_["yesterday"], returned_server->getModificationTime());

    // This call is expected to update the existing server.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[1]));

    {
        SCOPED_TRACE("UPDATE audit entry for server");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::UPDATE,
                          "server set");
    }

    // Verify that the server has been updated.
    ASSERT_NO_THROW_LOG(returned_server = cbptr_->getServer6(ServerTag("server1")));
    ASSERT_TRUE(returned_server);
    EXPECT_EQ("server1", returned_server->getServerTag().get());
    EXPECT_EQ("this is server 1 bis", returned_server->getDescription());
    EXPECT_EQ(timestamps_["today"], returned_server->getModificationTime());

    uint64_t servers_deleted = 0;

    // Try to delete non-existing server.
    ASSERT_NO_THROW_LOG(servers_deleted = cbptr_->deleteServer6(ServerTag("server2")));
    EXPECT_EQ(0, servers_deleted);

    // Make sure that the server1 wasn't deleted.
    ASSERT_NO_THROW_LOG(returned_server = cbptr_->getServer6(ServerTag("server1")));
    EXPECT_TRUE(returned_server);

    // Deleting logical server 'all' is not allowed.
    ASSERT_THROW(cbptr_->deleteServer6(ServerTag()), isc::InvalidOperation);

    // Delete the existing server.
    ASSERT_NO_THROW_LOG(servers_deleted = cbptr_->deleteServer6(ServerTag("server1")));
    EXPECT_EQ(1, servers_deleted);

    {
        SCOPED_TRACE("DELETE audit entry for server");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::DELETE,
                          "deleting a server");
    }

    // Make sure that the server is gone.
    ASSERT_NO_THROW_LOG(returned_server = cbptr_->getServer6(ServerTag("server1")));
    EXPECT_FALSE(returned_server);
}

void
GenericConfigBackendDHCPv6Test::getAndDeleteAllServersTest() {
    for (unsigned i = 1; i < test_servers_.size(); ++i) {
        ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[i]));
    }

    ServerCollection servers;
    ASSERT_NO_THROW_LOG(servers = cbptr_->getAllServers6());
    ASSERT_EQ(test_servers_.size() - 1, servers.size());

    // All servers should have been returned.
    EXPECT_TRUE(ServerFetcher::get(servers, ServerTag("server1")));
    EXPECT_TRUE(ServerFetcher::get(servers, ServerTag("server2")));
    EXPECT_TRUE(ServerFetcher::get(servers, ServerTag("server3")));

    // The logical server all should not be returned. We merely return the
    // user configured servers.
    EXPECT_FALSE(ServerFetcher::get(servers, ServerTag()));

    // Delete all servers and make sure they are gone.
    uint64_t deleted_servers = 0;
    ASSERT_NO_THROW_LOG(deleted_servers = cbptr_->deleteAllServers6());

    ASSERT_NO_THROW_LOG(servers = cbptr_->getAllServers6());
    EXPECT_TRUE(servers.empty());

    // All servers should be gone.
    EXPECT_FALSE(ServerFetcher::get(servers, ServerTag("server1")));
    EXPECT_FALSE(ServerFetcher::get(servers, ServerTag("server2")));
    EXPECT_FALSE(ServerFetcher::get(servers, ServerTag("server3")));

    // The number of deleted server should be equal to the number of
    // inserted servers. The logical 'all' server should be excluded.
    EXPECT_EQ(test_servers_.size() - 1, deleted_servers);

    EXPECT_EQ(1, countRows("dhcp6_server"));
}

void
GenericConfigBackendDHCPv6Test::createUpdateDeleteGlobalParameter6Test() {
    StampedValuePtr global_parameter = StampedValue::create("global", "whale");

    // Explicitly set modification time to make sure that the time
    // returned from the database is correct.
    global_parameter->setModificationTime(timestamps_["yesterday"]);
    cbptr_->createUpdateGlobalParameter6(ServerSelector::ALL(),
                                         global_parameter);

    {
        SCOPED_TRACE("CREATE audit entry for global parameter");
        testNewAuditEntry("dhcp6_global_parameter",
                          AuditEntry::ModificationType::CREATE,
                          "global parameter set");
    }

    // Verify returned parameter and the modification time.
    StampedValuePtr returned_global_parameter =
        cbptr_->getGlobalParameter6(ServerSelector::ALL(), "global");
    ASSERT_TRUE(returned_global_parameter);
    EXPECT_EQ("global", returned_global_parameter->getName());
    EXPECT_EQ("whale", returned_global_parameter->getValue());
    EXPECT_TRUE(returned_global_parameter->getModificationTime() ==
                global_parameter->getModificationTime());
    ASSERT_EQ(1, returned_global_parameter->getServerTags().size());
    EXPECT_EQ("all", returned_global_parameter->getServerTags().begin()->get());

    // Because we have added the global parameter for all servers, it
    // should be also returned for the explicitly specified server.
    returned_global_parameter = cbptr_->getGlobalParameter6(ServerSelector::ONE("server1"),
                                                            "global");
    ASSERT_TRUE(returned_global_parameter);
    EXPECT_EQ("global", returned_global_parameter->getName());
    EXPECT_EQ("whale", returned_global_parameter->getValue());
    EXPECT_TRUE(returned_global_parameter->getModificationTime() ==
                global_parameter->getModificationTime());
    ASSERT_EQ(1, returned_global_parameter->getServerTags().size());
    EXPECT_EQ("all", returned_global_parameter->getServerTags().begin()->get());

    // Check that the parameter is updated when selector is specified correctly.
    global_parameter = StampedValue::create("global", "fish");
    cbptr_->createUpdateGlobalParameter6(ServerSelector::ALL(),
                                         global_parameter);
    returned_global_parameter = cbptr_->getGlobalParameter6(ServerSelector::ALL(),
                                                            "global");
    ASSERT_TRUE(returned_global_parameter);
    EXPECT_EQ("global", returned_global_parameter->getName());
    EXPECT_EQ("fish", returned_global_parameter->getValue());
    EXPECT_TRUE(returned_global_parameter->getModificationTime() ==
                global_parameter->getModificationTime());
    ASSERT_EQ(1, returned_global_parameter->getServerTags().size());
    EXPECT_EQ("all", returned_global_parameter->getServerTags().begin()->get());

    {
        SCOPED_TRACE("UPDATE audit entry for the global parameter");
        testNewAuditEntry("dhcp6_global_parameter",
                          AuditEntry::ModificationType::UPDATE,
                          "global parameter set");
    }

    // Should not delete parameter specified for all servers if explicit
    // server name is provided.
    EXPECT_EQ(0, cbptr_->deleteGlobalParameter6(ServerSelector::ONE("server1"),
                                                "global"));

    // Delete parameter and make sure it is gone.
    cbptr_->deleteGlobalParameter6(ServerSelector::ALL(), "global");
    returned_global_parameter = cbptr_->getGlobalParameter6(ServerSelector::ALL(),
                                                            "global");
    EXPECT_FALSE(returned_global_parameter);

    {
        SCOPED_TRACE("DELETE audit entry for the global parameter");
        testNewAuditEntry("dhcp6_global_parameter",
                          AuditEntry::ModificationType::DELETE,
                          "global parameter deleted");
    }
}

void
GenericConfigBackendDHCPv6Test::globalParameters6WithServerTagsTest() {
    // Create three global parameters having the same name.
    StampedValuePtr global_parameter1 = StampedValue::create("global", "value1");
    StampedValuePtr global_parameter2 = StampedValue::create("global", "value2");
    StampedValuePtr global_parameter3 = StampedValue::create("global", "value3");

    // Try to insert one of them and associate with non-existing server.
    // This should fail because the server must be inserted first.
    ASSERT_THROW(cbptr_->createUpdateGlobalParameter6(ServerSelector::ONE("server1"),
                                                      global_parameter1),
                 NullKeyError);

    // Create two servers.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[1]));
    {
        SCOPED_TRACE("server1 is created");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));
    {
        SCOPED_TRACE("server2 is created");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    // This time inserting the global parameters for the server1 and server2 should
    // be successful.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateGlobalParameter6(ServerSelector::ONE("server1"),
                                                             global_parameter1));
    {
        SCOPED_TRACE("Global parameter for server1 is set");
        // The value of 3 means there should be 3 audit entries available for the
        // server1, two that indicate creation of the servers and one that we
        // validate, which sets the global value.
        testNewAuditEntry("dhcp6_global_parameter",
                          AuditEntry::ModificationType::CREATE,
                          "global parameter set",
                          ServerSelector::ONE("server1"),
                          3, 1);
    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateGlobalParameter6(ServerSelector::ONE("server2"),
                                                             global_parameter2));
    {
        SCOPED_TRACE("Global parameter for server2 is set");
        // Same as in case of the server2, there should be 3 audit entries of
        // which one we validate.
        testNewAuditEntry("dhcp6_global_parameter",
                          AuditEntry::ModificationType::CREATE,
                          "global parameter set",
                          ServerSelector::ONE("server2"),
                          3, 1);
    }

    // The last parameter is associated with all servers.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateGlobalParameter6(ServerSelector::ALL(),
                                                             global_parameter3));
    {
        SCOPED_TRACE("Global parameter for all servers is set");
        // There should be one new audit entry for all servers. It indicates
        // the insertion of the global value.
        testNewAuditEntry("dhcp6_global_parameter",
                          AuditEntry::ModificationType::CREATE,
                          "global parameter set",
                          ServerSelector::ALL(),
                          1, 1);
    }

    StampedValuePtr returned_global;

    // Try to fetch the value specified for all servers.
    ASSERT_NO_THROW_LOG(
        returned_global = cbptr_->getGlobalParameter6(ServerSelector::ALL(),
                                                      "global")
    );
    ASSERT_TRUE(returned_global);
    EXPECT_EQ(global_parameter3->getValue(), returned_global->getValue());
    ASSERT_EQ(1, returned_global->getServerTags().size());
    EXPECT_EQ("all", returned_global->getServerTags().begin()->get());

    // Try to fetch the value specified for the server1. This should override the
    // value specified for all servers.
    ASSERT_NO_THROW_LOG(
        returned_global = cbptr_->getGlobalParameter6(ServerSelector::ONE("server1"),
                                                      "global")
    );
    ASSERT_TRUE(returned_global);
    EXPECT_EQ(global_parameter1->getValue(), returned_global->getValue());

    ASSERT_EQ(1, returned_global->getServerTags().size());
    EXPECT_EQ("server1", returned_global->getServerTags().begin()->get());

    // The same in case of the server2.
    ASSERT_NO_THROW_LOG(
        returned_global = cbptr_->getGlobalParameter6(ServerSelector::ONE("server2"),
                                                      "global")
    );
    ASSERT_TRUE(returned_global);
    EXPECT_EQ(global_parameter2->getValue(), returned_global->getValue());
    ASSERT_EQ(1, returned_global->getServerTags().size());
    EXPECT_EQ("server2", returned_global->getServerTags().begin()->get());

    StampedValueCollection returned_globals;

    // Try to fetch the collection of globals for the server1, server2 and server3.
    // The server3 does not have an explicit value so for this server we should get
    /// the value for 'all'.
    ASSERT_NO_THROW_LOG(
        returned_globals = cbptr_->getAllGlobalParameters6(ServerSelector::
                                                           MULTIPLE({ "server1", "server2",
                                                                      "server3" }));
    );
    ASSERT_EQ(3, returned_globals.size());

    // Capture the returned values into the map so as we can check the
    // values against the servers.
    std::map<std::string, std::string> values;
    for (auto const& g : returned_globals) {
        ASSERT_EQ(1, g->getServerTags().size());
        values[g->getServerTags().begin()->get()] = g->getValue();
    }

    ASSERT_EQ(3, values.size());
    EXPECT_EQ(global_parameter1->getValue(), values["server1"]);
    EXPECT_EQ(global_parameter2->getValue(), values["server2"]);
    EXPECT_EQ(global_parameter3->getValue(), values["all"]);

    // Try to fetch the collection of global parameters specified for all servers.
    // This excludes the values specific to server1 and server2. It returns only the
    // common ones.
    ASSERT_NO_THROW_LOG(
        returned_globals = cbptr_->getAllGlobalParameters6(ServerSelector::ALL())
    );
    ASSERT_EQ(1, returned_globals.size());
    returned_global = *returned_globals.begin();
    EXPECT_EQ(global_parameter3->getValue(), returned_global->getValue());
    ASSERT_EQ(1, returned_global->getServerTags().size());
    EXPECT_EQ("all", returned_global->getServerTags().begin()->get());

    // Delete the server1. It should remove associations of this server with the
    // global parameter and the global parameter itself.
    ASSERT_NO_THROW_LOG(cbptr_->deleteServer6(ServerTag("server1")));
    ASSERT_NO_THROW_LOG(
        returned_globals = cbptr_->getAllGlobalParameters6(ServerSelector::ONE("server1"))
    );
    ASSERT_EQ(1, returned_globals.size());
    returned_global = *returned_globals.begin();
    // As a result, the value fetched for the server1 should be the one available for
    // all servers, rather than the one dedicated for server1. The association of
    // the server1 specific value with the server1 should be gone.
    EXPECT_EQ(global_parameter3->getValue(), returned_global->getValue());
    ASSERT_EQ(1, returned_global->getServerTags().size());
    EXPECT_EQ("all", returned_global->getServerTags().begin()->get());

    {
        SCOPED_TRACE("DELETE audit entry for the global parameter after server deletion");
        // We expect two new audit entries for the server1, one indicating that the
        // server has been deleted and another one indicating that the corresponding
        // global value has been deleted. We check the latter entry.
        testNewAuditEntry("dhcp6_global_parameter",
                          AuditEntry::ModificationType::DELETE,
                          "deleting a server", ServerSelector::ONE("server1"),
                          2, 1);
    }

    // Attempt to delete global parameter for server1.
    uint64_t deleted_num = 0;
    ASSERT_NO_THROW_LOG(deleted_num = cbptr_->deleteGlobalParameter6(ServerSelector::ONE("server1"),
                                                                     "global"));
    // No parameters should be deleted. In particular, the parameter for the logical
    // server 'all' should not be deleted.
    EXPECT_EQ(0, deleted_num);

    // Deleting the existing value for server2 should succeed.
    ASSERT_NO_THROW_LOG(deleted_num = cbptr_->deleteGlobalParameter6(ServerSelector::ONE("server2"),
                                                                     "global"));
    EXPECT_EQ(1, deleted_num);

    // Create it again to test that deletion of all server removes this too.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateGlobalParameter6(ServerSelector::ONE("server2"),
                                                             global_parameter2));

    // Delete all servers, except 'all'.
    ASSERT_NO_THROW_LOG(deleted_num = cbptr_->deleteAllServers6());
    ASSERT_NO_THROW_LOG(
        returned_globals = cbptr_->getAllGlobalParameters6(ServerSelector::ALL())
    );
    EXPECT_EQ(1, deleted_num);
    ASSERT_EQ(1, returned_globals.size());
    returned_global = *returned_globals.begin();
    // The common value for all servers should still be available because 'all'
    // logical server should not be deleted.
    EXPECT_EQ(global_parameter3->getValue(), returned_global->getValue());
    ASSERT_EQ(1, returned_global->getServerTags().size());
    EXPECT_EQ("all", returned_global->getServerTags().begin()->get());

    {
        SCOPED_TRACE("DELETE audit entry for the global parameter after deletion of"
                     " all servers");
        // There should be 4 new audit entries. One for deleting the global, one for
        // re-creating it, one for deleting the server2 and one for deleting the
        // global again as a result of deleting the server2.
        testNewAuditEntry("dhcp6_global_parameter",
                          AuditEntry::ModificationType::DELETE,
                          "deleting all servers", ServerSelector::ONE("server2"),
                          4, 1);
    }
}

void
GenericConfigBackendDHCPv6Test::getAllGlobalParameters6Test() {
    // Create 3 parameters and put them into the database.
    cbptr_->createUpdateGlobalParameter6(ServerSelector::ALL(),
        StampedValue::create("name1", "value1"));
    cbptr_->createUpdateGlobalParameter6(ServerSelector::ALL(),
        StampedValue::create("name2", Element::create(static_cast<int64_t>(65))));
    cbptr_->createUpdateGlobalParameter6(ServerSelector::ALL(),
        StampedValue::create("name3", "value3"));
    cbptr_->createUpdateGlobalParameter6(ServerSelector::ALL(),
        StampedValue::create("name4", Element::create(static_cast<bool>(true))));
    cbptr_->createUpdateGlobalParameter6(ServerSelector::ALL(),
        StampedValue::create("name5", Element::create(static_cast<double>(1.65))));

    // Fetch all parameters.
    auto parameters = cbptr_->getAllGlobalParameters6(ServerSelector::ALL());
    ASSERT_EQ(5, parameters.size());

    auto const& parameters_index = parameters.get<StampedValueNameIndexTag>();

    // Verify their values.
    EXPECT_EQ("value1", (*parameters_index.find("name1"))->getValue());
    EXPECT_EQ(65, (*parameters_index.find("name2"))->getIntegerValue());
    EXPECT_EQ("value3", (*parameters_index.find("name3"))->getValue());
    EXPECT_TRUE((*parameters_index.find("name4"))->getBoolValue());
    EXPECT_EQ(1.65, (*parameters_index.find("name5"))->getDoubleValue());

    for (auto const& param : parameters_index) {
        ASSERT_EQ(1, param->getServerTags().size());
        EXPECT_EQ("all", param->getServerTags().begin()->get());
    }

    // Should be able to fetch these parameters when explicitly providing
    // the server tag.
    parameters = cbptr_->getAllGlobalParameters6(ServerSelector::ONE("server1"));
    EXPECT_EQ(5, parameters.size());

    // Deleting global parameters with non-matching server selector
    // should fail.
    EXPECT_EQ(0, cbptr_->deleteAllGlobalParameters6(ServerSelector::ONE("server1")));

    // Delete all parameters and make sure they are gone.
    EXPECT_EQ(5, cbptr_->deleteAllGlobalParameters6(ServerSelector::ALL()));
    parameters = cbptr_->getAllGlobalParameters6(ServerSelector::ALL());
    EXPECT_TRUE(parameters.empty());
}

void
GenericConfigBackendDHCPv6Test::getModifiedGlobalParameters6Test() {
    // Create 3 global parameters and assign modification times:
    // "yesterday", "today" and "tomorrow" respectively.
    StampedValuePtr value = StampedValue::create("name1", "value1");
    value->setModificationTime(timestamps_["yesterday"]);
    cbptr_->createUpdateGlobalParameter6(ServerSelector::ALL(),
                                         value);

    value = StampedValue::create("name2", Element::create(static_cast<int64_t>(65)));
    value->setModificationTime(timestamps_["today"]);
    cbptr_->createUpdateGlobalParameter6(ServerSelector::ALL(),
                                         value);

    value = StampedValue::create("name3", "value3");
    value->setModificationTime(timestamps_["tomorrow"]);
    cbptr_->createUpdateGlobalParameter6(ServerSelector::ALL(),
                                         value);

    // Get parameters modified after "today".
    auto parameters = cbptr_->getModifiedGlobalParameters6(ServerSelector::ALL(),
                                                           timestamps_["after today"]);

    auto const& parameters_index = parameters.get<StampedValueNameIndexTag>();

    // It should be the one modified "tomorrow".
    ASSERT_EQ(1, parameters_index.size());

    auto parameter = parameters_index.find("name3");
    ASSERT_FALSE(parameter == parameters_index.end());

    ASSERT_TRUE(*parameter);
    EXPECT_EQ("value3", (*parameter)->getValue());

    // Should be able to fetct these parameters when explicitly providing
    // the server tag.
    parameters = cbptr_->getModifiedGlobalParameters6(ServerSelector::ONE("server1"),
                                                      timestamps_["after today"]);
    EXPECT_EQ(1, parameters.size());
}

void
GenericConfigBackendDHCPv6Test::nullKeyErrorTest() {
    // Create a global parameter (it should work with any object type).
    StampedValuePtr global_parameter = StampedValue::create("global", "value");

    // Try to insert it and associate with non-existing server.
    std::string msg;
    try {
        cbptr_->createUpdateGlobalParameter6(ServerSelector::ONE("server1"),
                                             global_parameter);
        msg = "got no exception";
    } catch (const NullKeyError& ex) {
        msg = ex.what();
    } catch (const std::exception&) {
        msg = "got another exception";
    }
    EXPECT_EQ("server 'server1' does not exist", msg);
}

void
GenericConfigBackendDHCPv6Test::createUpdateSubnet6SelectorsTest() {
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));

    // Supported selectors.
    Subnet6Ptr subnet = test_subnets_[0];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(),
                                                    subnet));
    subnet = test_subnets_[2];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ONE("server1"),
                                                    subnet));
    subnet = test_subnets_[3];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                                    subnet));

    // Not supported server selectors.
    ASSERT_THROW(cbptr_->createUpdateSubnet6(ServerSelector::ANY(), subnet),
                 isc::InvalidOperation);

    // Not implemented server selectors.
    ASSERT_THROW(cbptr_->createUpdateSubnet6(ServerSelector::UNASSIGNED(),
                                             subnet),
                 isc::NotImplemented);
}

void
GenericConfigBackendDHCPv6Test::getSubnet6Test() {
    // Insert the server2 into the database.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));
    {
        SCOPED_TRACE("CREATE audit entry for server");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    auto subnet = test_subnets_[0];
    auto subnet2 = test_subnets_[2];

    // An attempt to add a subnet to a non-existing server (server1) should fail.
    ASSERT_THROW(cbptr_->createUpdateSubnet6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                             subnet2),
                 NullKeyError);

    // The subnet shouldn't have been added, even though one of the servers exists.
    Subnet6Ptr returned_subnet;
    ASSERT_NO_THROW_LOG(returned_subnet = cbptr_->getSubnet6(ServerSelector::ONE("server2"),
                                                             subnet2->getID()));
    EXPECT_FALSE(returned_subnet);

    // Insert two subnets, one for all servers and one for server2.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet));
    {
        SCOPED_TRACE("A. CREATE audit entry for the subnet");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::CREATE,
                          "subnet set");
    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ONE("server2"), subnet2));
    {
        SCOPED_TRACE("B. CREATE audit entry for the subnet");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::CREATE,
                          "subnet set", ServerSelector::ONE("subnet2"),
                          2, 1);
    }

    // We are not going to support selection of a single entry for multiple servers.
    ASSERT_THROW(cbptr_->getSubnet6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                    subnet->getID()),
                 isc::InvalidOperation);

    ASSERT_THROW(cbptr_->getSubnet6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                    subnet->toText()),
                 isc::InvalidOperation);

    // Test that this subnet will be fetched for various server selectors.
    auto test_get_subnet = [this, &subnet] (const std::string& test_case_name,
                                            const ServerSelector& server_selector,
                                            const std::string& expected_tag = ServerTag::ALL) {
        SCOPED_TRACE(test_case_name);

        // Test fetching subnet by id.
        Subnet6Ptr returned_subnet_2;
        ASSERT_NO_THROW_LOG(
            returned_subnet_2 = cbptr_->getSubnet6(server_selector, subnet->getID()));
        ASSERT_TRUE(returned_subnet_2);

        ASSERT_EQ(1, returned_subnet_2->getServerTags().size());
        EXPECT_TRUE(returned_subnet_2->hasServerTag(ServerTag(expected_tag)));

        ASSERT_EQ(subnet->toElement()->str(), returned_subnet_2->toElement()->str());

        // Test fetching subnet by prefix.
        ASSERT_NO_THROW_LOG(
            returned_subnet_2 = cbptr_->getSubnet6(server_selector, subnet->toText()));
        ASSERT_TRUE(returned_subnet_2);

        ASSERT_EQ(1, returned_subnet_2->getServerTags().size());
        EXPECT_TRUE(returned_subnet_2->hasServerTag(ServerTag(expected_tag)));

        EXPECT_EQ(subnet->toElement()->str(), returned_subnet_2->toElement()->str());
    };

    {
        SCOPED_TRACE("testing various server selectors before update");
        test_get_subnet("all servers", ServerSelector::ALL());
        test_get_subnet("one server", ServerSelector::ONE("server1"));
        test_get_subnet("any server", ServerSelector::ANY());
    }

    subnet = subnet2;
    {
        SCOPED_TRACE("testing server selectors for another server");
        test_get_subnet("one server", ServerSelector::ONE("server2"), "server2");
        test_get_subnet("any server", ServerSelector::ANY(), "server2");
    }

    // Update the subnet in the database (both use the same ID).
    subnet = test_subnets_[1];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet));
    {
        SCOPED_TRACE("C. CREATE audit entry for the subnet");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::UPDATE,
                          "subnet set");
    }

    {
        SCOPED_TRACE("testing various server selectors after update");
        test_get_subnet("all servers", ServerSelector::ALL());
        test_get_subnet("one server", ServerSelector::ONE("server1"));
        test_get_subnet("any server", ServerSelector::ANY());
    }

    // The server2 specific subnet should not be returned if the server selector
    // is not matching.
    EXPECT_FALSE(cbptr_->getSubnet6(ServerSelector::ALL(), subnet2->getID()));
    EXPECT_FALSE(cbptr_->getSubnet6(ServerSelector::ALL(), subnet2->toText()));
    EXPECT_FALSE(cbptr_->getSubnet6(ServerSelector::ONE("server1"), subnet2->getID()));
    EXPECT_FALSE(cbptr_->getSubnet6(ServerSelector::ONE("server1"), subnet2->toText()));

    // Update the subnet in the database (both use the same prefix).
    subnet2.reset(new Subnet6(IOAddress("2001:db8:3::"),
                              64, 30, 40, 50, 80, 8192));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ONE("server2"), subnet2));

    // Fetch again and verify.
    returned_subnet = cbptr_->getSubnet6(ServerSelector::ONE("server2"), subnet2->toText());
    ASSERT_TRUE(returned_subnet);
    EXPECT_EQ(subnet2->toElement()->str(), returned_subnet->toElement()->str());

    // Update the subnet when it conflicts same id and same prefix both
    // with different subnets. This should throw.
    // Subnets are 2001:db8:1::/48 id 1024 and 2001:db8:3::/64 id 8192
    subnet2.reset(new Subnet6(IOAddress("2001:db8:1::"),
                              48, 30, 40, 50, 80, 8192));
    ASSERT_THROW(cbptr_->createUpdateSubnet6(ServerSelector::ONE("server2"),  subnet2),
                 DuplicateEntry);
}

void
GenericConfigBackendDHCPv6Test::getSubnet6byIdSelectorsTest() {
    // Supported selectors.
    ASSERT_NO_THROW_LOG(cbptr_->getSubnet6(ServerSelector::ANY(), SubnetID(1)));
    ASSERT_NO_THROW_LOG(cbptr_->getSubnet6(ServerSelector::UNASSIGNED(), SubnetID(1)));
    ASSERT_NO_THROW_LOG(cbptr_->getSubnet6(ServerSelector::ALL(), SubnetID(1)));
    ASSERT_NO_THROW_LOG(cbptr_->getSubnet6(ServerSelector::ONE("server1"), SubnetID(1)));

    // Not supported selectors.
    ASSERT_THROW(cbptr_->getSubnet6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                    SubnetID(1)),
                 isc::InvalidOperation);
}

void
GenericConfigBackendDHCPv6Test::getSubnet6WithOptionalUnspecifiedTest() {
    // Create a subnet and wrap it within a shared network. It is important
    // to have the shared network to verify that the subnet doesn't inherit
    // the values of the shared network but stores the NULL values in the
    // for those parameters that are unspecified on the subnet level.
    Subnet6Ptr subnet = test_subnets_[2];
    SharedNetwork6Ptr shared_network = test_networks_[0];
    shared_network->add(subnet);

    // Need to add the shared network to the database because otherwise
    // the subnet foreign key would fail.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(), shared_network));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet));

    // Fetch this subnet by subnet identifier.
    Subnet6Ptr returned_subnet;
    ASSERT_NO_THROW_LOG(returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                                             subnet->getID()));
    ASSERT_TRUE(returned_subnet);

    EXPECT_TRUE(returned_subnet->getIface().unspecified());
    EXPECT_TRUE(returned_subnet->getIface().empty());

    EXPECT_TRUE(returned_subnet->getClientClasses().empty());

    EXPECT_TRUE(returned_subnet->getValid().unspecified());
    EXPECT_EQ(0, returned_subnet->getValid().get());

    EXPECT_TRUE(returned_subnet->getPreferred().unspecified());
    EXPECT_EQ(0, returned_subnet->getPreferred().get());

    EXPECT_TRUE(returned_subnet->getT1().unspecified());
    EXPECT_EQ(0, returned_subnet->getT1().get());

    EXPECT_TRUE(returned_subnet->getT2().unspecified());
    EXPECT_EQ(0, returned_subnet->getT2().get());

    EXPECT_TRUE(returned_subnet->getReservationsGlobal().unspecified());
    EXPECT_FALSE(returned_subnet->getReservationsGlobal().get());

    EXPECT_TRUE(returned_subnet->getReservationsInSubnet().unspecified());
    EXPECT_TRUE(returned_subnet->getReservationsInSubnet().get());

    EXPECT_TRUE(returned_subnet->getReservationsOutOfPool().unspecified());
    EXPECT_FALSE(returned_subnet->getReservationsOutOfPool().get());

    EXPECT_TRUE(returned_subnet->getCalculateTeeTimes().unspecified());
    EXPECT_FALSE(returned_subnet->getCalculateTeeTimes().get());

    EXPECT_TRUE(returned_subnet->getT1Percent().unspecified());
    EXPECT_EQ(0.0, returned_subnet->getT1Percent().get());

    EXPECT_TRUE(returned_subnet->getT2Percent().unspecified());
    EXPECT_EQ(0.0, returned_subnet->getT2Percent().get());

    EXPECT_TRUE(returned_subnet->getRapidCommit().unspecified());
    EXPECT_FALSE(returned_subnet->getRapidCommit().get());

    EXPECT_FALSE(returned_subnet->getDdnsSendUpdates().unspecified());
    EXPECT_TRUE(returned_subnet->getDdnsSendUpdates().get());

    EXPECT_FALSE(returned_subnet->getDdnsOverrideNoUpdate().unspecified());
    EXPECT_TRUE(returned_subnet->getDdnsOverrideNoUpdate().get());

    EXPECT_FALSE(returned_subnet->getDdnsOverrideClientUpdate().unspecified());
    EXPECT_FALSE(returned_subnet->getDdnsOverrideClientUpdate().get());

    EXPECT_FALSE(returned_subnet->getDdnsReplaceClientNameMode().unspecified());
    EXPECT_EQ(D2ClientConfig::ReplaceClientNameMode::RCM_WHEN_PRESENT,
              returned_subnet->getDdnsReplaceClientNameMode().get());

    EXPECT_FALSE(returned_subnet->getDdnsGeneratedPrefix().unspecified());
    EXPECT_EQ("myhost", returned_subnet->getDdnsGeneratedPrefix().get());

    EXPECT_FALSE(returned_subnet->getDdnsQualifyingSuffix().unspecified());
    EXPECT_EQ("example.org", returned_subnet->getDdnsQualifyingSuffix().get());

    // The easiest way to verify whether the returned subnet matches the inserted
    // subnet is to convert both to text.
    EXPECT_EQ(subnet->toElement()->str(), returned_subnet->toElement()->str());
}

void
GenericConfigBackendDHCPv6Test::getSubnet6SharedNetworkTest() {
    Subnet6Ptr subnet = test_subnets_[0];
    SharedNetwork6Ptr shared_network = test_networks_[0];

    // Add subnet to a shared network.
    shared_network->add(subnet);

    // Store shared network in the database.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(),
                                                           shared_network));

    // Store subnet associated with the shared network in the database.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet));

    // Fetch this subnet by subnet identifier.
    Subnet6Ptr returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                                    test_subnets_[0]->getID());
    ASSERT_TRUE(returned_subnet);
    ASSERT_EQ(1, returned_subnet->getServerTags().size());
    EXPECT_EQ("all", returned_subnet->getServerTags().begin()->get());

    // The easiest way to verify whether the returned subnet matches the inserted
    // subnet is to convert both to text.
    EXPECT_EQ(subnet->toElement()->str(), returned_subnet->toElement()->str());

    // However, the check above doesn't verify whether shared network name was
    // correctly returned from the database.
    EXPECT_EQ(shared_network->getName(), returned_subnet->getSharedNetworkName());
}

void
GenericConfigBackendDHCPv6Test::getSubnet6ByPrefixTest() {
    // Insert subnet to the database.
    Subnet6Ptr subnet = test_subnets_[0];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet));

    // Fetch the subnet by prefix.
    Subnet6Ptr returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                                    "2001:db8::/64");
    ASSERT_TRUE(returned_subnet);
    ASSERT_EQ(1, returned_subnet->getServerTags().size());
    EXPECT_EQ("all", returned_subnet->getServerTags().begin()->get());

    // Verify subnet contents.
    EXPECT_EQ(subnet->toElement()->str(), returned_subnet->toElement()->str());

    // Fetching the subnet for an explicitly specified server tag should
    // succeed too.
    returned_subnet = cbptr_->getSubnet6(ServerSelector::ONE("server1"),
                                         "2001:db8::/64");
    EXPECT_EQ(subnet->toElement()->str(), returned_subnet->toElement()->str());
}

void
GenericConfigBackendDHCPv6Test::getSubnet6byPrefixSelectorsTest() {
    // Supported selectors.
    ASSERT_NO_THROW_LOG(cbptr_->getSubnet6(ServerSelector::ANY(), "192.0.2.0/26"));
    ASSERT_NO_THROW_LOG(cbptr_->getSubnet6(ServerSelector::UNASSIGNED(), "192.0.2.0/26"));
    ASSERT_NO_THROW_LOG(cbptr_->getSubnet6(ServerSelector::ALL(), "192.0.2.0/26"));
    ASSERT_NO_THROW_LOG(cbptr_->getSubnet6(ServerSelector::ONE("server1"), "192.0.2.0/26"));

    // Not supported selectors.
    ASSERT_THROW(cbptr_->getSubnet6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                    "192.0.2.0/26"),
                 isc::InvalidOperation);
}

void
GenericConfigBackendDHCPv6Test::getAllSubnets6Test() {
    // Insert test subnets into the database. Note that the second subnet will
    // overwrite the first subnet as they use the same ID.
    for (auto const& subnet : test_subnets_) {
        cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet);

        // That subnet overrides the first subnet so the audit entry should
        // indicate an update.
        if (subnet->toText() == "2001:db8:1::/48") {
            SCOPED_TRACE("UPDATE audit entry for the subnet " + subnet->toText());
            testNewAuditEntry("dhcp6_subnet",
                              AuditEntry::ModificationType::UPDATE,
                              "subnet set");

        } else {
            SCOPED_TRACE("CREATE audit entry for the subnet " + subnet->toText());
            testNewAuditEntry("dhcp6_subnet",
                              AuditEntry::ModificationType::CREATE,
                              "subnet set");
        }
    }

    // Fetch all subnets.
    Subnet6Collection subnets = cbptr_->getAllSubnets6(ServerSelector::ALL());
    ASSERT_EQ(test_subnets_.size() - 1, subnets.size());

    // All subnets should also be returned for explicitly specified server tag.
    subnets = cbptr_->getAllSubnets6(ServerSelector::ONE("server1"));
    ASSERT_EQ(test_subnets_.size() - 1, subnets.size());

    // See if the subnets are returned ok.
    auto subnet_it = subnets.begin();
    for (unsigned i = 0; i < subnets.size(); ++i, ++subnet_it) {
        ASSERT_EQ(1, (*subnet_it)->getServerTags().size());
        EXPECT_EQ("all", (*subnet_it)->getServerTags().begin()->get());
        EXPECT_EQ(test_subnets_[i + 1]->toElement()->str(),
                  (*subnet_it)->toElement()->str());
    }

    // Attempt to remove the non existing subnet should return 0.
    EXPECT_EQ(0, cbptr_->deleteSubnet6(ServerSelector::ALL(), 22));
    EXPECT_EQ(0, cbptr_->deleteSubnet6(ServerSelector::ALL(),
                                       "2001:db8:555::/64"));
    // All subnets should be still there.
    ASSERT_EQ(test_subnets_.size() - 1, subnets.size());

    // Should not delete the subnet for explicit server tag because
    // our subnet is for all servers.
    EXPECT_EQ(0, cbptr_->deleteSubnet6(ServerSelector::ONE("server1"),
                                       test_subnets_[1]->getID()));

    // Also, verify that behavior when deleting by prefix.
    EXPECT_EQ(0, cbptr_->deleteSubnet6(ServerSelector::ONE("server1"),
                                       test_subnets_[2]->toText()));

    // Same for all subnets.
    EXPECT_EQ(0, cbptr_->deleteAllSubnets6(ServerSelector::ONE("server1")));

    // Delete first subnet by id and verify that it is gone.
    EXPECT_EQ(1, cbptr_->deleteSubnet6(ServerSelector::ALL(),
                                       test_subnets_[1]->getID()));

    {
        SCOPED_TRACE("DELETE first subnet audit entry");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::DELETE,
                          "subnet deleted");
    }

    subnets = cbptr_->getAllSubnets6(ServerSelector::ALL());
    ASSERT_EQ(test_subnets_.size() - 2, subnets.size());

    // Delete second subnet by prefix and verify it is gone.
    EXPECT_EQ(1, cbptr_->deleteSubnet6(ServerSelector::ALL(),
                                       test_subnets_[2]->toText()));
    subnets = cbptr_->getAllSubnets6(ServerSelector::ALL());
    ASSERT_EQ(test_subnets_.size() - 3, subnets.size());

    {
        SCOPED_TRACE("DELETE second subnet audit entry");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::DELETE,
                          "subnet deleted");
    }

    // Delete all.
    EXPECT_EQ(1, cbptr_->deleteAllSubnets6(ServerSelector::ALL()));
    subnets = cbptr_->getAllSubnets6(ServerSelector::ALL());
    ASSERT_TRUE(subnets.empty());

    {
        SCOPED_TRACE("DELETE all subnets audit entry");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::DELETE,
                          "deleted all subnets");
    }
}

void
GenericConfigBackendDHCPv6Test::getAllSubnets6SelectorsTest() {
    // Supported selectors.
    ASSERT_NO_THROW_LOG(cbptr_->getAllSubnets6(ServerSelector::UNASSIGNED()));
    ASSERT_NO_THROW_LOG(cbptr_->getAllSubnets6(ServerSelector::ALL()));
    ASSERT_NO_THROW_LOG(cbptr_->getAllSubnets6(ServerSelector::ONE("server1")));
    ASSERT_NO_THROW_LOG(cbptr_->getAllSubnets6(ServerSelector::MULTIPLE({ "server1", "server2" })));

    // Not supported selectors.
    ASSERT_THROW(cbptr_->getAllSubnets6(ServerSelector::ANY()), isc::InvalidOperation);
}

void
GenericConfigBackendDHCPv6Test::getAllSubnets6WithServerTagsTest() {
    auto subnet1 = test_subnets_[0];
    auto subnet2 = test_subnets_[2];
    auto subnet3 = test_subnets_[3];

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(),
                                                    subnet1));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ONE("server1"),
                                                    subnet2));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                                    subnet3));

    Subnet6Collection subnets;

    // All three subnets are associated with the server1.
    ASSERT_NO_THROW_LOG(subnets = cbptr_->getAllSubnets6(ServerSelector::ONE("server1")));
    EXPECT_EQ(3, subnets.size());

    // First subnet is associated with all servers.
    auto returned_subnet = SubnetFetcher6::get(subnets, SubnetID(1024));
    ASSERT_TRUE(returned_subnet);
    EXPECT_TRUE(returned_subnet->hasAllServerTag());
    EXPECT_FALSE(returned_subnet->hasServerTag(ServerTag("server1")));
    EXPECT_FALSE(returned_subnet->hasServerTag(ServerTag("server2")));

    // Second subnet is only associated with the server1.
    returned_subnet = SubnetFetcher6::get(subnets, SubnetID(2048));
    ASSERT_TRUE(returned_subnet);
    EXPECT_FALSE(returned_subnet->hasAllServerTag());
    EXPECT_TRUE(returned_subnet->hasServerTag(ServerTag("server1")));
    EXPECT_FALSE(returned_subnet->hasServerTag(ServerTag("server2")));

    // Third subnet is associated with both server1 and server2.
    returned_subnet = SubnetFetcher6::get(subnets, SubnetID(4096));
    ASSERT_TRUE(returned_subnet);
    EXPECT_FALSE(returned_subnet->hasAllServerTag());
    EXPECT_TRUE(returned_subnet->hasServerTag(ServerTag("server1")));
    EXPECT_TRUE(returned_subnet->hasServerTag(ServerTag("server2")));

    // For server2 we should only get two subnets, i.e. first and last.
    ASSERT_NO_THROW_LOG(subnets = cbptr_->getAllSubnets6(ServerSelector::ONE("server2")));
    EXPECT_EQ(2, subnets.size());

    // First subnet is associated with all servers.
    returned_subnet = SubnetFetcher6::get(subnets, SubnetID(1024));
    ASSERT_TRUE(returned_subnet);
    EXPECT_TRUE(returned_subnet->hasAllServerTag());
    EXPECT_FALSE(returned_subnet->hasServerTag(ServerTag("server1")));
    EXPECT_FALSE(returned_subnet->hasServerTag(ServerTag("server2")));

    // Last subnet is associated with server1 and server2.
    returned_subnet = SubnetFetcher6::get(subnets, SubnetID(4096));
    ASSERT_TRUE(returned_subnet);
    EXPECT_FALSE(returned_subnet->hasAllServerTag());
    EXPECT_TRUE(returned_subnet->hasServerTag(ServerTag("server1")));
    EXPECT_TRUE(returned_subnet->hasServerTag(ServerTag("server2")));

    // Only the first subnet is associated with all servers.
    ASSERT_NO_THROW_LOG(subnets = cbptr_->getAllSubnets6(ServerSelector::ALL()));
    EXPECT_EQ(1, subnets.size());

    returned_subnet = SubnetFetcher6::get(subnets, SubnetID(1024));
    ASSERT_TRUE(returned_subnet);
    EXPECT_TRUE(returned_subnet->hasAllServerTag());
    EXPECT_FALSE(returned_subnet->hasServerTag(ServerTag("server1")));
    EXPECT_FALSE(returned_subnet->hasServerTag(ServerTag("server2")));
}

void
GenericConfigBackendDHCPv6Test::getModifiedSubnets6SelectorsTest() {
    // Supported selectors.
    ASSERT_NO_THROW_LOG(cbptr_->getModifiedSubnets6(ServerSelector::UNASSIGNED(),
                                                    timestamps_["yesterday"]));
    ASSERT_NO_THROW_LOG(cbptr_->getModifiedSubnets6(ServerSelector::ALL(),
                                                    timestamps_["yesterday"]));
    ASSERT_NO_THROW_LOG(cbptr_->getModifiedSubnets6(ServerSelector::ONE("server1"),
                                                    timestamps_["yesterday"]));
    ASSERT_NO_THROW_LOG(cbptr_->getModifiedSubnets6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                                    timestamps_["yesterday"]));

    // Not supported selectors.
    EXPECT_THROW(cbptr_->getModifiedSubnets6(ServerSelector::ANY(),
                                             timestamps_["yesterday"]),
                 isc::InvalidOperation);
}

void
GenericConfigBackendDHCPv6Test::deleteSubnet6Test() {
    // Create two servers in the database.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));
    {
        SCOPED_TRACE("CREATE audit entry for server");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));
    {
        SCOPED_TRACE("CREATE audit entry for server");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    auto subnet1 = test_subnets_[0];
    auto subnet2 = test_subnets_[2];
    auto subnet3 = test_subnets_[3];

    auto create_test_subnets = [&] () {
        // Insert three subnets, one for all servers, one for server2 and one for two
        // servers: server1 and server2.
        ASSERT_NO_THROW_LOG(
            cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet1)
        );
        ASSERT_NO_THROW_LOG(
            cbptr_->createUpdateSubnet6(ServerSelector::ONE("server2"), subnet2)
        );
        ASSERT_NO_THROW_LOG(
            cbptr_->createUpdateSubnet6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                        subnet3)
        );
    };

    create_test_subnets();

    // Test that subnet is not deleted for a specified server selector.
    auto test_no_delete = [this] (const std::string& test_case_name,
                                  const ServerSelector& server_selector,
                                  const Subnet6Ptr& subnet) {
        SCOPED_TRACE(test_case_name);
        uint64_t deleted_count = 0;
        ASSERT_NO_THROW_LOG(
            deleted_count = cbptr_->deleteSubnet6(server_selector, subnet->getID())
        );
        EXPECT_EQ(0, deleted_count);

        deleted_count = 0;
        ASSERT_NO_THROW_LOG(
            deleted_count = cbptr_->deleteSubnet6(server_selector, subnet->toText())
        );
        EXPECT_EQ(0, deleted_count);
    };

    {
        SCOPED_TRACE("Test valid but non matching server selectors");
        test_no_delete("selector: one, actual: all", ServerSelector::ONE("server2"),
                       subnet1);
        test_no_delete("selector: all, actual: one", ServerSelector::ALL(),
                       subnet2);
        test_no_delete("selector: all, actual: multiple", ServerSelector::ALL(),
                       subnet3);
    }

    // Test successful deletion of a subnet by ID.
    auto test_delete_by_id = [this] (const std::string& test_case_name,
                                     const ServerSelector& server_selector,
                                     const Subnet6Ptr& subnet) {
        SCOPED_TRACE(test_case_name);
        uint64_t deleted_count = 0;
        ASSERT_NO_THROW_LOG(
            deleted_count = cbptr_->deleteSubnet6(server_selector, subnet->getID())
        );
        EXPECT_EQ(1, deleted_count);

        EXPECT_FALSE(cbptr_->getSubnet6(server_selector, subnet->getID()));
    };

    test_delete_by_id("all servers", ServerSelector::ALL(), subnet1);
    test_delete_by_id("any server", ServerSelector::ANY(), subnet2);
    test_delete_by_id("one server", ServerSelector::ONE("server1"), subnet3);

    // Re-create deleted subnets.
    create_test_subnets();

    // Test successful deletion of a subnet by prefix.
    auto test_delete_by_prefix = [this] (const std::string& test_case_name,
                                         const ServerSelector& server_selector,
                                         const Subnet6Ptr& subnet) {
        SCOPED_TRACE(test_case_name);
        uint64_t deleted_count = 0;
        ASSERT_NO_THROW_LOG(
            deleted_count = cbptr_->deleteSubnet6(server_selector, subnet->toText())
        );
        EXPECT_EQ(1, deleted_count);

        EXPECT_FALSE(cbptr_->getSubnet6(server_selector, subnet->toText()));
    };

    test_delete_by_prefix("all servers", ServerSelector::ALL(), subnet1);
    test_delete_by_prefix("any server", ServerSelector::ANY(), subnet2);
    test_delete_by_prefix("one server", ServerSelector::ONE("server1"), subnet3);
}

void
GenericConfigBackendDHCPv6Test::deleteSubnet6ByIdSelectorsTest() {
    // Supported selectors.
    ASSERT_NO_THROW_LOG(cbptr_->deleteSubnet6(ServerSelector::ANY(), SubnetID(1)));
    ASSERT_NO_THROW_LOG(cbptr_->deleteSubnet6(ServerSelector::ALL(), SubnetID(1)));
    ASSERT_NO_THROW_LOG(cbptr_->deleteSubnet6(ServerSelector::ONE("server1"), SubnetID(1)));

    // Not supported selectors.
    ASSERT_THROW(cbptr_->deleteSubnet6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                           SubnetID(1)),
                 isc::InvalidOperation);

    // Not implemented selectors.
    ASSERT_THROW(cbptr_->deleteSubnet6(ServerSelector::UNASSIGNED(), SubnetID(1)),
                 isc::NotImplemented);
}

void
GenericConfigBackendDHCPv6Test::deleteSubnet6ByPrefixSelectorsTest() {
    // Supported selectors.
    ASSERT_NO_THROW_LOG(cbptr_->deleteSubnet6(ServerSelector::ANY(), "192.0.2.0/26"));
    ASSERT_NO_THROW_LOG(cbptr_->deleteSubnet6(ServerSelector::ALL(), "192.0.2.0/26"));
    ASSERT_NO_THROW_LOG(cbptr_->deleteSubnet6(ServerSelector::ONE("server1"), "192.0.2.0/26"));

    // Not supported selectors.
    ASSERT_THROW(cbptr_->deleteSubnet6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                           "192.0.2.0/26"),
                 isc::InvalidOperation);

    // Not implemented selectors.
    ASSERT_THROW(cbptr_->deleteSubnet6(ServerSelector::UNASSIGNED(), "192.0.2.0/26"),
                 isc::NotImplemented);
}

void
GenericConfigBackendDHCPv6Test::deleteAllSubnets6SelectorsTest() {
    // Supported selectors.
    ASSERT_NO_THROW_LOG(cbptr_->deleteAllSubnets6(ServerSelector::UNASSIGNED()));
    ASSERT_NO_THROW_LOG(cbptr_->deleteAllSubnets6(ServerSelector::ALL()));
    ASSERT_NO_THROW_LOG(cbptr_->deleteAllSubnets6(ServerSelector::ONE("server1")));

    // Not supported selectors.
    ASSERT_THROW(cbptr_->deleteAllSubnets6(ServerSelector::ANY()),
                 isc::InvalidOperation);
    ASSERT_THROW(cbptr_->deleteAllSubnets6(ServerSelector::MULTIPLE({ "server1", "server2" })),
                 isc::InvalidOperation);
}

void
GenericConfigBackendDHCPv6Test::unassignedSubnet6Test() {
    // Create the server.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));

    // Create the subnets and associate them with the server1.
    auto subnet = test_subnets_[0];
    auto subnet2 = test_subnets_[2];
    ASSERT_NO_THROW_LOG(
        cbptr_->createUpdateSubnet6(ServerSelector::ONE("server1"), subnet)
    );
    ASSERT_NO_THROW_LOG(
        cbptr_->createUpdateSubnet6(ServerSelector::ONE("server1"), subnet2)
    );

    // Delete the server. The subnets should be preserved but are considered orphaned,
    // i.e. do not belong to any server.
    uint64_t deleted_count = 0;
    ASSERT_NO_THROW_LOG(deleted_count = cbptr_->deleteServer6(ServerTag("server1")));
    EXPECT_EQ(1, deleted_count);

    // Trying to fetch the subnet by server tag should return no result.
    Subnet6Ptr returned_subnet;
    ASSERT_NO_THROW_LOG(returned_subnet = cbptr_->getSubnet6(ServerSelector::ONE("server1"),
                                                             subnet->getID()));
    EXPECT_FALSE(returned_subnet);

    // The same if we use other calls.
    ASSERT_NO_THROW_LOG(returned_subnet = cbptr_->getSubnet6(ServerSelector::ONE("server1"),
                                                             subnet->toText()));
    EXPECT_FALSE(returned_subnet);

    Subnet6Collection returned_subnets;
    ASSERT_NO_THROW_LOG(returned_subnets = cbptr_->getAllSubnets6(ServerSelector::ONE("server1")));
    EXPECT_TRUE(returned_subnets.empty());

    ASSERT_NO_THROW_LOG(
        returned_subnets = cbptr_->getModifiedSubnets6(ServerSelector::ONE("server1"),
                                                       timestamps_["two days ago"])
    );
    EXPECT_TRUE(returned_subnets.empty());

    // We should get the subnet if we ask for unassigned.
    ASSERT_NO_THROW_LOG(returned_subnet = cbptr_->getSubnet6(ServerSelector::UNASSIGNED(),
                                                             subnet->getID()));
    ASSERT_TRUE(returned_subnet);

    ASSERT_NO_THROW_LOG(returned_subnet = cbptr_->getSubnet6(ServerSelector::UNASSIGNED(),
                                                             subnet->toText()));
    ASSERT_TRUE(returned_subnet);

    // Also if we ask for all unassigned subnets it should be returned.
    ASSERT_NO_THROW_LOG(returned_subnets = cbptr_->getAllSubnets6(ServerSelector::UNASSIGNED()));
    ASSERT_EQ(2, returned_subnets.size());

    // Same for modified subnets.
    ASSERT_NO_THROW_LOG(
        returned_subnets = cbptr_->getModifiedSubnets6(ServerSelector::UNASSIGNED(),
                                                       timestamps_["two days ago"])
    );
    ASSERT_EQ(2, returned_subnets.size());

    // If we ask for any subnet by subnet id, it should be returned too.
    ASSERT_NO_THROW_LOG(returned_subnet = cbptr_->getSubnet6(ServerSelector::ANY(),
                                                             subnet->getID()));
    ASSERT_TRUE(returned_subnet);

    ASSERT_NO_THROW_LOG(returned_subnet = cbptr_->getSubnet6(ServerSelector::ANY(),
                                                             subnet->toText()));
    ASSERT_TRUE(returned_subnet);

    // Deleting the subnet with the mismatched server tag should not affect our
    // subnet.
    ASSERT_NO_THROW_LOG(
        deleted_count = cbptr_->deleteSubnet6(ServerSelector::ONE("server1"),
                                              subnet->getID())
    );
    EXPECT_EQ(0, deleted_count);

    // Also, if we delete all subnets for server1.
    ASSERT_NO_THROW_LOG(
        deleted_count = cbptr_->deleteAllSubnets6(ServerSelector::ONE("server1"))
    );
    EXPECT_EQ(0, deleted_count);

    // We can delete this subnet when we specify ANY and the matching id.
    ASSERT_NO_THROW_LOG(
        deleted_count = cbptr_->deleteSubnet6(ServerSelector::ANY(), subnet->getID())
    );
    EXPECT_EQ(1, deleted_count);

    // We can delete all subnets using UNASSIGNED selector.
    ASSERT_NO_THROW_LOG(
        deleted_count = cbptr_->deleteAllSubnets6(ServerSelector::UNASSIGNED());
    );
    EXPECT_EQ(1, deleted_count);
}

void
GenericConfigBackendDHCPv6Test::getModifiedSubnets6Test() {
    // Explicitly set timestamps of subnets. First subnet has a timestamp
    // pointing to the future. Second subnet has timestamp pointing to the
    // past (yesterday). Third subnet has a timestamp pointing to the
    // past (an hour ago).
    test_subnets_[1]->setModificationTime(timestamps_["tomorrow"]);
    test_subnets_[2]->setModificationTime(timestamps_["yesterday"]);
    test_subnets_[3]->setModificationTime(timestamps_["today"]);

    // Insert subnets into the database.
    for (unsigned i = 1; i < test_subnets_.size(); ++i) {
        cbptr_->createUpdateSubnet6(ServerSelector::ALL(),
                                    test_subnets_[i]);
    }

    // Fetch subnets with timestamp later than today. Only one subnet
    // should be returned.
    Subnet6Collection
        subnets = cbptr_->getModifiedSubnets6(ServerSelector::ALL(),
                                              timestamps_["after today"]);
    ASSERT_EQ(1, subnets.size());

    // All subnets should also be returned for explicitly specified server tag.
    subnets = cbptr_->getModifiedSubnets6(ServerSelector::ONE("server1"),
                                          timestamps_["after today"]);
    ASSERT_EQ(1, subnets.size());

    // Fetch subnets with timestamp later than yesterday. We should get
    // two subnets.
    subnets = cbptr_->getModifiedSubnets6(ServerSelector::ALL(),
                                          timestamps_["after yesterday"]);
    ASSERT_EQ(2, subnets.size());

    // Fetch subnets with timestamp later than tomorrow. Nothing should
    // be returned.
    subnets = cbptr_->getModifiedSubnets6(ServerSelector::ALL(),
                                          timestamps_["after tomorrow"]);
    ASSERT_TRUE(subnets.empty());
}

void
GenericConfigBackendDHCPv6Test::subnetLifetimeTest() {
    // Insert new subnet with unspecified valid lifetime
    Triplet<uint32_t> unspecified;
    Subnet6Ptr subnet(new Subnet6(IOAddress("2001:db8::"), 64, 30, 40,
                                  unspecified, unspecified, 1111));
    subnet->setIface("eth1");
    cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet);

    // Fetch this subnet by subnet identifier
    Subnet6Ptr returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                                    subnet->getID());
    ASSERT_TRUE(returned_subnet);

    // Verified returned and original subnets match.
    EXPECT_EQ(subnet->toElement()->str(), returned_subnet->toElement()->str());

    // Update the preferred and valid lifetime.
    subnet->setPreferred( Triplet<uint32_t>(100, 200, 300));
    subnet->setValid( Triplet<uint32_t>(200, 300, 400));
    cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet);

    // Fetch and verify again.
    returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(), subnet->getID());
    ASSERT_TRUE(returned_subnet);
    EXPECT_EQ(subnet->toElement()->str(), returned_subnet->toElement()->str());
}

void
GenericConfigBackendDHCPv6Test::getSharedNetworkSubnets6Test() {
    // Assign test subnets to shared networks level1 and level2.
    test_subnets_[1]->setSharedNetworkName("level1");
    test_subnets_[2]->setSharedNetworkName("level2");
    test_subnets_[3]->setSharedNetworkName("level2");

    // Store shared networks in the database.
    for (auto const& network : test_networks_) {
        cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(), network);
    }

    // Store subnets in the database.
    for (auto const& subnet : test_subnets_) {
        cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet);
    }

    // Fetch all subnets belonging to shared network level1.
    Subnet6Collection subnets = cbptr_->getSharedNetworkSubnets6(ServerSelector::ALL(),
                                                                 "level1");
    ASSERT_EQ(1, subnets.size());

    // Returned subnet should match test subnet #1.
    EXPECT_TRUE(isEquivalent(test_subnets_[1]->toElement(),
                             (*subnets.begin())->toElement()));

    // All subnets should also be returned for ANY server.
    subnets = cbptr_->getSharedNetworkSubnets6(ServerSelector::ANY(), "level1");
    ASSERT_EQ(1, subnets.size());

    // Returned subnet should match test subnet #1.
    EXPECT_TRUE(isEquivalent(test_subnets_[1]->toElement(),
                             (*subnets.begin())->toElement()));

    // Check server tag
    ASSERT_EQ(1, (*subnets.begin())->getServerTags().size());
    EXPECT_EQ("all", (*subnets.begin())->getServerTags().begin()->get());

    // Fetch all subnets belonging to shared network level2.
    subnets = cbptr_->getSharedNetworkSubnets6(ServerSelector::ALL(), "level2");
    ASSERT_EQ(2, subnets.size());

    ElementPtr test_list = Element::createList();
    test_list->add(test_subnets_[2]->toElement());
    test_list->add(test_subnets_[3]->toElement());

    ElementPtr returned_list = Element::createList();
    auto subnet = subnets.begin();
    returned_list->add((*subnet)->toElement());
    returned_list->add((*++subnet)->toElement());

    EXPECT_TRUE(isEquivalent(returned_list, test_list));

    // All subnets should also be returned for explicitly specified server tag.
    subnets = cbptr_->getSharedNetworkSubnets6(ServerSelector::ONE("server1"), "level2");
    ASSERT_EQ(2, subnets.size());

    returned_list = Element::createList();
    subnet = subnets.begin();
    returned_list->add((*subnet)->toElement());
    returned_list->add((*++subnet)->toElement());

    EXPECT_TRUE(isEquivalent(returned_list, test_list));
}

void
GenericConfigBackendDHCPv6Test::subnetUpdatePoolsTest() {

    auto test_subnet_update = [this](const std::string& subnet_prefix,
                                     const SubnetID& subnet_id) {
        // Add the subnet with two address pools and two prefix delegation
        // pools.
        ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(),
                                                        test_subnets_[0]));
        // Make sure that the pools have been added to the database.
        EXPECT_EQ(2, countRows("dhcp6_pool"));
        EXPECT_EQ(2, countRows("dhcp6_pd_pool"));

        // Create the subnet without options which updates the existing
        // subnet.
        Subnet6Ptr subnet(new Subnet6(IOAddress(subnet_prefix), 64, 30, 60, 50, 60,
                                      subnet_id));
        ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet));
        // Check that options are gone.
        EXPECT_EQ(0, countRows("dhcp6_pool"));
        EXPECT_EQ(0, countRows("dhcp6_pd_pool"));
    };

    {
        SCOPED_TRACE("update subnet, modify subnet id");
        // Create another subnet with the same prefix as the original subnet but
        // different id. This is legal to update the subnet id if the prefix is
        // stable. However, the new subnet has no address pools, so we need to
        // check of the pools associated with the existing subnet instance are
        // gone after the update.
        test_subnet_update("2001:db8::", 2048);
    }

    {
        SCOPED_TRACE("update subnet, modify prefix");
        // Create a subnet with the same subnet id but different prefix.
        // The prefix should be updated.
        test_subnet_update("2001:db9::", 1024);
    }
}

void
GenericConfigBackendDHCPv6Test::subnetOptionsTest() {
    // Add the subnet with two pools and three options.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), test_subnets_[0]));
    EXPECT_EQ(2, countRows("dhcp6_pool"));
    EXPECT_EQ(2, countRows("dhcp6_pd_pool"));
    EXPECT_EQ(3, countRows("dhcp6_options"));

    // The second subnet uses the same subnet id, so this operation should replace
    // the existing subnet and its options. The new instance has four pools, each
    // including one option, so we should end up with four options.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), test_subnets_[1]));
    EXPECT_EQ(2, countRows("dhcp6_pool"));
    EXPECT_EQ(2, countRows("dhcp6_pd_pool"));
    EXPECT_EQ(4, countRows("dhcp6_options"));

    // Add third subnet with a single option. The number of options in the database
    // should now be 5.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), test_subnets_[2]));
    EXPECT_EQ(2, countRows("dhcp6_pool"));
    EXPECT_EQ(2, countRows("dhcp6_pd_pool"));
    EXPECT_EQ(5, countRows("dhcp6_options"));

    // Delete the subnet. All options and pools it contains should also be removed, leaving
    // the last added subnet and its sole option.
    ASSERT_NO_THROW_LOG(cbptr_->deleteSubnet6(ServerSelector::ALL(), test_subnets_[1]->getID()));
    EXPECT_EQ(1, countRows("dhcp6_subnet"));
    EXPECT_EQ(0, countRows("dhcp6_pool"));
    EXPECT_EQ(0, countRows("dhcp6_pd_pool"));
    EXPECT_EQ(1, countRows("dhcp6_options"));

    // Add the first subnet again. We should now have 4 options: 3 options from the
    // newly added subnet and one option from the existing subnet.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), test_subnets_[0]));
    EXPECT_EQ(2, countRows("dhcp6_pool"));
    EXPECT_EQ(2, countRows("dhcp6_pd_pool"));
    EXPECT_EQ(4, countRows("dhcp6_options"));

    // Delete the subnet including 3 options. The option from the other subnet should not
    // be affected.
    ASSERT_NO_THROW_LOG(cbptr_->deleteSubnet6(ServerSelector::ALL(), test_subnets_[0]->getID()));
    EXPECT_EQ(1, countRows("dhcp6_subnet"));
    EXPECT_EQ(0, countRows("dhcp6_pool"));
    EXPECT_EQ(0, countRows("dhcp6_pd_pool"));
    EXPECT_EQ(1, countRows("dhcp6_options"));
}

void
GenericConfigBackendDHCPv6Test::getSharedNetwork6Test() {
    // Insert the server2 into the database.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));
    {
        SCOPED_TRACE("CREATE audit entry for server");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    auto shared_network = test_networks_[0];
    auto shared_network2 = test_networks_[2];

    // Insert two shared networks, one for all servers, and one for server2.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(),
                                                           shared_network));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ONE("server2"),
                                                           shared_network2));

    // We are not going to support selection of a single entry for multiple servers.
    ASSERT_THROW(cbptr_->getSharedNetwork6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                           test_networks_[0]->getName()),
                 isc::InvalidOperation);

    // Test that this shared network will be fetched for various server selectors.
    auto test_get_network = [this, &shared_network] (const std::string& test_case_name,
                                                     const ServerSelector& server_selector,
                                                     const std::string& expected_tag = ServerTag::ALL) {
        SCOPED_TRACE(test_case_name);
        SharedNetwork6Ptr network;
        ASSERT_NO_THROW_LOG(network = cbptr_->getSharedNetwork6(server_selector,
                                                                shared_network->getName()));
        ASSERT_TRUE(network);

        EXPECT_GT(network->getId(), 0);
        ASSERT_EQ(1, network->getServerTags().size());
        EXPECT_EQ(expected_tag, network->getServerTags().begin()->get());

        // The easiest way to verify whether the returned shared network matches the
        // inserted shared network is to convert both to text.
        EXPECT_EQ(shared_network->toElement()->str(), network->toElement()->str());
    };

    {
        SCOPED_TRACE("testing various server selectors before update");
        test_get_network("all servers", ServerSelector::ALL());
        test_get_network("one server", ServerSelector::ONE("server1"));
        test_get_network("any server", ServerSelector::ANY());
    }

    {
        SCOPED_TRACE("CREATE audit entry for a shared network");
        testNewAuditEntry("dhcp6_shared_network",
                          AuditEntry::ModificationType::CREATE,
                          "shared network set");
    }

    // Update shared network in the database.
    shared_network = test_networks_[1];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(),
                                                           shared_network));

    {
        SCOPED_TRACE("testing various server selectors after update");
        test_get_network("all servers after update", ServerSelector::ALL());
        test_get_network("one server after update", ServerSelector::ONE("server1"));
        test_get_network("any server after update", ServerSelector::ANY());
    }

    {
        SCOPED_TRACE("UPDATE audit entry for a shared network");
        testNewAuditEntry("dhcp6_shared_network",
                          AuditEntry::ModificationType::UPDATE,
                          "shared network set");
    }

    // The server2 specific shared network should not be returned if the
    // server selector is not matching.
    EXPECT_FALSE(cbptr_->getSharedNetwork6(ServerSelector::ALL(),
                                           shared_network2->getName()));
    EXPECT_FALSE(cbptr_->getSharedNetwork6(ServerSelector::ONE("server1"),
                                           shared_network2->getName()));

    {
        SCOPED_TRACE("testing selectors for server2 specific shared network");
        shared_network = shared_network2;
        test_get_network("one server", ServerSelector::ONE("server2"), "server2");
        test_get_network("any server", ServerSelector::ANY(), "server2");
    }
}

void
GenericConfigBackendDHCPv6Test::getSharedNetwork6SelectorsTest() {
    // Supported selectors.
    ASSERT_NO_THROW_LOG(cbptr_->getSharedNetwork6(ServerSelector::ANY(), "level1"));
    ASSERT_NO_THROW_LOG(cbptr_->getSharedNetwork6(ServerSelector::UNASSIGNED(), "level1"));
    ASSERT_NO_THROW_LOG(cbptr_->getSharedNetwork6(ServerSelector::ALL(), "level1"));
    ASSERT_NO_THROW_LOG(cbptr_->getSharedNetwork6(ServerSelector::ONE("server1"), "level1"));

    // Not supported selectors.
    ASSERT_THROW(cbptr_->getSharedNetwork6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                           "level1"),
                 isc::InvalidOperation);
}

void
GenericConfigBackendDHCPv6Test::createUpdateSharedNetwork6Test() {
    auto shared_network = test_networks_[0];

    // An attempt to insert the shared network for non-existing server should fail.
    ASSERT_THROW(cbptr_->createUpdateSharedNetwork6(ServerSelector::ONE("server1"),
                                                    shared_network),
                 NullKeyError);

    // Insert the server1 into the database.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));
    {
        SCOPED_TRACE("CREATE audit entry for server");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    // Insert the server2 into the database.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));
    {
        SCOPED_TRACE("CREATE audit entry for server");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(),
                                                           shared_network));
    {
        SCOPED_TRACE("CREATE audit entry for shared network and ALL servers");
        testNewAuditEntry("dhcp6_shared_network",
                          AuditEntry::ModificationType::CREATE,
                          "shared network set");
    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                                           shared_network));
    {
        SCOPED_TRACE("UPDATE audit entry for shared network and MULTIPLE servers");
        testNewAuditEntry("dhcp6_shared_network",
                          AuditEntry::ModificationType::UPDATE,
                          "shared network set");
    }

    SharedNetwork6Ptr network;
    ASSERT_NO_THROW_LOG(network = cbptr_->getSharedNetwork6(ServerSelector::ANY(),
                                                            shared_network->getName()));
    ASSERT_TRUE(network);
    EXPECT_TRUE(network->hasServerTag(ServerTag("server1")));
    EXPECT_TRUE(network->hasServerTag(ServerTag("server2")));
    EXPECT_FALSE(network->hasServerTag(ServerTag()));
}

void
GenericConfigBackendDHCPv6Test::createUpdateSharedNetwork6SelectorsTest() {
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));

    // Supported selectors.
    SharedNetwork6Ptr shared_network(new SharedNetwork6("all"));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(),
                                                           shared_network));
    shared_network.reset(new SharedNetwork6("one"));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ONE("server1"),
                                                           shared_network));
    shared_network.reset(new SharedNetwork6("multiple"));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                                           shared_network));

    // Not supported server selectors.
    ASSERT_THROW(cbptr_->createUpdateSharedNetwork6(ServerSelector::ANY(), shared_network),
                 isc::InvalidOperation);

    // Not implemented server selectors.
    ASSERT_THROW(cbptr_->createUpdateSharedNetwork6(ServerSelector::UNASSIGNED(),
                                                    shared_network),
                 isc::NotImplemented);
}

void
GenericConfigBackendDHCPv6Test::getSharedNetwork6WithOptionalUnspecifiedTest() {
    // Insert new shared network.
    SharedNetwork6Ptr shared_network = test_networks_[2];
    cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(), shared_network);

    // Fetch this shared network by name.
    SharedNetwork6Ptr
        returned_network = cbptr_->getSharedNetwork6(ServerSelector::ALL(),
                                                     test_networks_[2]->getName());
    ASSERT_TRUE(returned_network);

    EXPECT_TRUE(returned_network->getIface().unspecified());
    EXPECT_TRUE(returned_network->getIface().empty());

    EXPECT_TRUE(returned_network->getClientClasses().empty());

    EXPECT_TRUE(returned_network->getValid().unspecified());
    EXPECT_EQ(0, returned_network->getValid().get());

    EXPECT_TRUE(returned_network->getPreferred().unspecified());
    EXPECT_EQ(0, returned_network->getPreferred().get());

    EXPECT_TRUE(returned_network->getT1().unspecified());
    EXPECT_EQ(0, returned_network->getT1().get());

    EXPECT_TRUE(returned_network->getT2().unspecified());
    EXPECT_EQ(0, returned_network->getT2().get());

    EXPECT_TRUE(returned_network->getReservationsGlobal().unspecified());
    EXPECT_FALSE(returned_network->getReservationsGlobal().get());

    EXPECT_TRUE(returned_network->getReservationsInSubnet().unspecified());
    EXPECT_TRUE(returned_network->getReservationsInSubnet().get());

    EXPECT_TRUE(returned_network->getReservationsOutOfPool().unspecified());
    EXPECT_FALSE(returned_network->getReservationsOutOfPool().get());

    EXPECT_TRUE(returned_network->getCalculateTeeTimes().unspecified());
    EXPECT_FALSE(returned_network->getCalculateTeeTimes().get());

    EXPECT_TRUE(returned_network->getT1Percent().unspecified());
    EXPECT_EQ(0.0, returned_network->getT1Percent().get());

    EXPECT_TRUE(returned_network->getT2Percent().unspecified());
    EXPECT_EQ(0.0, returned_network->getT2Percent().get());

    EXPECT_TRUE(returned_network->getRapidCommit().unspecified());
    EXPECT_FALSE(returned_network->getRapidCommit().get());

    EXPECT_FALSE(returned_network->getDdnsSendUpdates().unspecified());
    EXPECT_TRUE(returned_network->getDdnsSendUpdates().get());

    EXPECT_FALSE(returned_network->getDdnsOverrideNoUpdate().unspecified());
    EXPECT_TRUE(returned_network->getDdnsOverrideNoUpdate().get());

    EXPECT_FALSE(returned_network->getDdnsOverrideClientUpdate().unspecified());
    EXPECT_FALSE(returned_network->getDdnsOverrideClientUpdate().get());

    EXPECT_FALSE(returned_network->getDdnsReplaceClientNameMode().unspecified());
    EXPECT_EQ(D2ClientConfig::ReplaceClientNameMode::RCM_WHEN_PRESENT,
              returned_network->getDdnsReplaceClientNameMode().get());

    EXPECT_FALSE(returned_network->getDdnsGeneratedPrefix().unspecified());
    EXPECT_EQ("myhost", returned_network->getDdnsGeneratedPrefix().get());

    EXPECT_FALSE(returned_network->getDdnsQualifyingSuffix().unspecified());
    EXPECT_EQ("example.org", returned_network->getDdnsQualifyingSuffix().get());
}

void
GenericConfigBackendDHCPv6Test::deleteSharedNetworkSubnets6Test() {
    ASSERT_THROW(cbptr_->deleteSharedNetworkSubnets6(ServerSelector::UNASSIGNED(),
                                                     test_networks_[1]->getName()),
                 isc::InvalidOperation);
    ASSERT_THROW(cbptr_->deleteSharedNetworkSubnets6(ServerSelector::ALL(),
                                                     test_networks_[1]->getName()),
                 isc::InvalidOperation);
    ASSERT_THROW(cbptr_->deleteSharedNetworkSubnets6(ServerSelector::ONE("server1"),
                                                     test_networks_[1]->getName()),
                 isc::InvalidOperation);
    ASSERT_THROW(cbptr_->deleteSharedNetworkSubnets6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                                     test_networks_[1]->getName()),
                 isc::InvalidOperation);
}

void
GenericConfigBackendDHCPv6Test::getAllSharedNetworks6Test() {
    // Insert test shared networks into the database. Note that the second shared
    // network will overwrite the first shared network as they use the same name.
    for (auto const& network : test_networks_) {
        cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(), network);

        // That shared network overrides the first one so the audit entry should
        // indicate an update.
        if ((network->getName() == "level1") && (!audit_entries_["all"].empty())) {
            SCOPED_TRACE("UPDATE audit entry for the shared network " +
                         network->getName());
            testNewAuditEntry("dhcp6_shared_network",
                              AuditEntry::ModificationType::UPDATE,
                              "shared network set");

        } else {
            SCOPED_TRACE("CREATE audit entry for the shared network " +
                         network->getName());
            testNewAuditEntry("dhcp6_shared_network",
                              AuditEntry::ModificationType::CREATE,
                              "shared network set");
        }
    }

    // Fetch all shared networks.
    SharedNetwork6Collection networks =
        cbptr_->getAllSharedNetworks6(ServerSelector::ALL());
    ASSERT_EQ(test_networks_.size() - 1, networks.size());

    // All shared networks should also be returned for explicitly specified
    // server tag.
    networks = cbptr_->getAllSharedNetworks6(ServerSelector::ONE("server1"));
    ASSERT_EQ(test_networks_.size() - 1, networks.size());

    // See if shared networks are returned ok.
    for (unsigned i = 0; i < networks.size(); ++i) {
        EXPECT_EQ(test_networks_[i + 1]->toElement()->str(),
                  networks[i]->toElement()->str());
        ASSERT_EQ(1, networks[i]->getServerTags().size());
        EXPECT_EQ("all", networks[i]->getServerTags().begin()->get());
    }

    // Add some subnets.
    test_networks_[1]->add(test_subnets_[0]);
    test_subnets_[2]->setSharedNetworkName("level2");
    test_networks_[2]->add(test_subnets_[3]);
    cbptr_->createUpdateSubnet6(ServerSelector::ALL(), test_subnets_[0]);
    cbptr_->createUpdateSubnet6(ServerSelector::ALL(), test_subnets_[2]);
    cbptr_->createUpdateSubnet6(ServerSelector::ALL(), test_subnets_[3]);

    // Both ways to attach a subnet are equivalent.
    Subnet6Ptr subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                           test_subnets_[0]->getID());
    ASSERT_TRUE(subnet);
    EXPECT_EQ("level1", subnet->getSharedNetworkName());

    {
        SCOPED_TRACE("CREATE audit entry for subnets");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::CREATE,
                          "subnet set", ServerSelector::ALL(), 3);
    }

    // Deleting non-existing shared network should return 0.
    EXPECT_EQ(0, cbptr_->deleteSharedNetwork6(ServerSelector::ALL(),
                                              "big-fish"));
    // All shared networks should be still there.
    ASSERT_EQ(test_networks_.size() - 1, networks.size());

    // Should not delete the shared network for explicit server tag
    // because our shared network is for all servers.
    EXPECT_EQ(0, cbptr_->deleteSharedNetwork6(ServerSelector::ONE("server1"),
                                              test_networks_[1]->getName()));

    // Same for all shared networks.
    EXPECT_EQ(0, cbptr_->deleteAllSharedNetworks6(ServerSelector::ONE("server1")));

    // Delete first shared network with it subnets and verify it is gone.
    // Begin by its subnet.
    EXPECT_EQ(1, cbptr_->deleteSharedNetworkSubnets6(ServerSelector::ANY(),
                                                     test_networks_[1]->getName()));

    {
        SCOPED_TRACE("DELETE audit entry for subnets of the first shared network");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::DELETE,
                          "deleted all subnets for a shared network");
    }

    // Check that the subnet is gone..
    subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                test_subnets_[0]->getID());
    EXPECT_FALSE(subnet);

    // And after the shared network itself.
    EXPECT_EQ(1, cbptr_->deleteSharedNetwork6(ServerSelector::ALL(),
                                              test_networks_[1]->getName()));

    networks = cbptr_->getAllSharedNetworks6(ServerSelector::ALL());
    ASSERT_EQ(test_networks_.size() - 2, networks.size());

    {
        SCOPED_TRACE("DELETE audit entry for the first shared network");
        testNewAuditEntry("dhcp6_shared_network",
                          AuditEntry::ModificationType::DELETE,
                          "shared network deleted");
    }

    // Delete all.
    EXPECT_EQ(2, cbptr_->deleteAllSharedNetworks6(ServerSelector::ALL()));
    networks = cbptr_->getAllSharedNetworks6(ServerSelector::ALL());
    ASSERT_TRUE(networks.empty());

    {
        SCOPED_TRACE("DELETE audit entry for the remaining two shared networks");
        // The last parameter indicates that we expect four new audit entries,
        // two for deleted shared networks and two for updated subnets
        std::vector<ExpAuditEntry> exp_entries({
            {
                "dhcp6_shared_network",
                AuditEntry::ModificationType::DELETE, "deleted all shared networks"
            },
            {
                "dhcp6_subnet",
                AuditEntry::ModificationType::UPDATE, "deleted all shared networks"
            },
            {
                "dhcp6_subnet",
                AuditEntry::ModificationType::UPDATE, "deleted all shared networks"
            },
            {
                "dhcp6_shared_network",
                AuditEntry::ModificationType::DELETE, "deleted all shared networks"
            }
        });

        testNewAuditEntry(exp_entries, ServerSelector::ALL());
    }

    // Check that subnets are still there but detached.
    subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                test_subnets_[2]->getID());
    ASSERT_TRUE(subnet);
    EXPECT_TRUE(subnet->getSharedNetworkName().empty());
    subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                test_subnets_[3]->getID());
    ASSERT_TRUE(subnet);
    EXPECT_TRUE(subnet->getSharedNetworkName().empty());
}

void
GenericConfigBackendDHCPv6Test::getAllSharedNetworks6SelectorsTest() {
    // Supported selectors.
    ASSERT_NO_THROW_LOG(cbptr_->getAllSharedNetworks6(ServerSelector::UNASSIGNED()));
    ASSERT_NO_THROW_LOG(cbptr_->getAllSharedNetworks6(ServerSelector::ALL()));
    ASSERT_NO_THROW_LOG(cbptr_->getAllSharedNetworks6(ServerSelector::ONE("server1")));
    ASSERT_NO_THROW_LOG(cbptr_->getAllSharedNetworks6(ServerSelector::MULTIPLE({ "server1", "server2" })));

    // Not supported selectors.
    ASSERT_THROW(cbptr_->getAllSharedNetworks6(ServerSelector::ANY()),
                 isc::InvalidOperation);
}

void
GenericConfigBackendDHCPv6Test::getAllSharedNetworks6WithServerTagsTest() {
    auto shared_network1 = test_networks_[0];
    auto shared_network2 = test_networks_[2];
    auto shared_network3 = test_networks_[3];

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(),
                                                           shared_network1));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ONE("server1"),
                                                           shared_network2));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                                           shared_network3));

    SharedNetwork6Collection networks;

    // All three networks are associated with the server1.
    ASSERT_NO_THROW_LOG(networks = cbptr_->getAllSharedNetworks6(ServerSelector::ONE("server1")));
    EXPECT_EQ(3, networks.size());

    // First network is associated with all servers.
    auto returned_network = SharedNetworkFetcher6::get(networks, "level1");
    ASSERT_TRUE(returned_network);
    EXPECT_TRUE(returned_network->hasAllServerTag());
    EXPECT_FALSE(returned_network->hasServerTag(ServerTag("server1")));
    EXPECT_FALSE(returned_network->hasServerTag(ServerTag("server2")));

    // Second network is only associated with the server1.
    returned_network = SharedNetworkFetcher6::get(networks, "level2");
    ASSERT_TRUE(returned_network);
    EXPECT_FALSE(returned_network->hasAllServerTag());
    EXPECT_TRUE(returned_network->hasServerTag(ServerTag("server1")));
    EXPECT_FALSE(returned_network->hasServerTag(ServerTag("server2")));

    // Third network is associated with both server1 and server2.
    returned_network = SharedNetworkFetcher6::get(networks, "level3");
    ASSERT_TRUE(returned_network);
    EXPECT_FALSE(returned_network->hasAllServerTag());
    EXPECT_TRUE(returned_network->hasServerTag(ServerTag("server1")));
    EXPECT_TRUE(returned_network->hasServerTag(ServerTag("server2")));

    // For server2 we should only get two shared networks, i.e. first and last.
    ASSERT_NO_THROW_LOG(networks = cbptr_->getAllSharedNetworks6(ServerSelector::ONE("server2")));
    EXPECT_EQ(2, networks.size());

    // First shared network is associated with all servers.
    returned_network = SharedNetworkFetcher6::get(networks, "level1");
    ASSERT_TRUE(returned_network);
    EXPECT_TRUE(returned_network->hasAllServerTag());
    EXPECT_FALSE(returned_network->hasServerTag(ServerTag("server1")));
    EXPECT_FALSE(returned_network->hasServerTag(ServerTag("server2")));

    // Last shared network is associated with server1 and server2.
    returned_network = SharedNetworkFetcher6::get(networks, "level3");
    ASSERT_TRUE(returned_network);
    EXPECT_FALSE(returned_network->hasAllServerTag());
    EXPECT_TRUE(returned_network->hasServerTag(ServerTag("server1")));
    EXPECT_TRUE(returned_network->hasServerTag(ServerTag("server2")));

    // Only the first shared network is associated with all servers.
    ASSERT_NO_THROW_LOG(networks = cbptr_->getAllSharedNetworks6(ServerSelector::ALL()));
    EXPECT_EQ(1, networks.size());

    returned_network = SharedNetworkFetcher6::get(networks, "level1");
    ASSERT_TRUE(returned_network);
    EXPECT_TRUE(returned_network->hasAllServerTag());
    EXPECT_FALSE(returned_network->hasServerTag(ServerTag("server1")));
    EXPECT_FALSE(returned_network->hasServerTag(ServerTag("server2")));
}

void
GenericConfigBackendDHCPv6Test::getModifiedSharedNetworks6Test() {
    // Explicitly set timestamps of shared networks. First shared
    // network has a timestamp pointing to the future. Second shared
    // network has timestamp pointing to the past (yesterday).
    // Third shared network has a timestamp pointing to the
    // past (an hour ago).
    test_networks_[1]->setModificationTime(timestamps_["tomorrow"]);
    test_networks_[2]->setModificationTime(timestamps_["yesterday"]);
    test_networks_[3]->setModificationTime(timestamps_["today"]);

    // Insert shared networks into the database.
    for (unsigned i = 1; i < test_networks_.size(); ++i) {
        cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(),
                                           test_networks_[i]);
    }

    // Fetch shared networks with timestamp later than today. Only one
    // shared network should be returned.
    SharedNetwork6Collection
        networks = cbptr_->getModifiedSharedNetworks6(ServerSelector::ALL(),
                                                      timestamps_["after today"]);
    ASSERT_EQ(1, networks.size());

    // Fetch shared networks with timestamp later than yesterday. We
    // should get two shared networks.
    networks = cbptr_->getModifiedSharedNetworks6(ServerSelector::ALL(),
                                                  timestamps_["after yesterday"]);
    ASSERT_EQ(2, networks.size());

    // Fetch shared networks with timestamp later than tomorrow. Nothing
    // should be returned.
    networks = cbptr_->getModifiedSharedNetworks6(ServerSelector::ALL(),
                                                  timestamps_["after tomorrow"]);
    ASSERT_TRUE(networks.empty());
}

void
GenericConfigBackendDHCPv6Test::getModifiedSharedNetworks6SelectorsTest() {
    // Supported selectors.
    ASSERT_NO_THROW_LOG(cbptr_->getModifiedSharedNetworks6(ServerSelector::UNASSIGNED(),
                                                           timestamps_["yesterday"]));
    ASSERT_NO_THROW_LOG(cbptr_->getModifiedSharedNetworks6(ServerSelector::ALL(),
                                                           timestamps_["yesterday"]));
    ASSERT_NO_THROW_LOG(cbptr_->getModifiedSharedNetworks6(ServerSelector::ONE("server1"),
                                                           timestamps_["yesterday"]));
    ASSERT_NO_THROW_LOG(cbptr_->getModifiedSharedNetworks6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                                           timestamps_["yesterday"]));

    // Not supported selectors.
    ASSERT_THROW(cbptr_->getModifiedSharedNetworks6(ServerSelector::ANY(),
                                                    timestamps_["yesterday"]),
                 isc::InvalidOperation);
}

void
GenericConfigBackendDHCPv6Test::deleteSharedNetwork6Test() {
    // Create two servers in the database.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));
    {
        SCOPED_TRACE("CREATE audit entry for server");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));
    {
        SCOPED_TRACE("CREATE audit entry for server");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    auto shared_network1 = test_networks_[0];
    auto shared_network2 = test_networks_[2];
    auto shared_network3 = test_networks_[3];

    // Insert three shared networks, one for all servers, one for server2 and
    // one for two servers: server1 and server2.
    ASSERT_NO_THROW_LOG(
        cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(), shared_network1)
    );
    ASSERT_NO_THROW_LOG(
        cbptr_->createUpdateSharedNetwork6(ServerSelector::ONE("server2"), shared_network2)
    );
    ASSERT_NO_THROW_LOG(
        cbptr_->createUpdateSharedNetwork6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                           shared_network3)
    );

    auto test_no_delete = [this] (const std::string& test_case_name,
                                  const ServerSelector& server_selector,
                                  const SharedNetwork6Ptr& shared_network) {
        SCOPED_TRACE(test_case_name);
        uint64_t deleted_count = 0;
        ASSERT_NO_THROW_LOG(
            deleted_count = cbptr_->deleteSharedNetwork6(server_selector,
                                                         shared_network->getName())
        );
        EXPECT_EQ(0, deleted_count);
    };

    {
        SCOPED_TRACE("Test valid but non matching server selectors");
        test_no_delete("selector: one, actual: all", ServerSelector::ONE("server2"),
                       shared_network1);
        test_no_delete("selector: all, actual: one", ServerSelector::ALL(),
                       shared_network2);
        test_no_delete("selector: all, actual: multiple", ServerSelector::ALL(),
                       shared_network3);
    }

    // We are not going to support deletion of a single entry for multiple servers.
    ASSERT_THROW(cbptr_->deleteSharedNetwork6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                              shared_network3->getName()),
                 isc::InvalidOperation);

    // We currently don't support deleting a shared network with specifying
    // an unassigned server tag. Use ANY to delete any subnet instead.
    ASSERT_THROW(cbptr_->deleteSharedNetwork6(ServerSelector::UNASSIGNED(),
                                              shared_network1->getName()),
                 isc::NotImplemented);

    // Test successful deletion of a shared network.
    auto test_delete = [this] (const std::string& test_case_name,
                               const ServerSelector& server_selector,
                               const SharedNetwork6Ptr& shared_network) {
        SCOPED_TRACE(test_case_name);
        uint64_t deleted_count = 0;
        ASSERT_NO_THROW_LOG(
            deleted_count = cbptr_->deleteSharedNetwork6(server_selector,
                                                         shared_network->getName())
        );
        EXPECT_EQ(1, deleted_count);

        EXPECT_FALSE(cbptr_->getSharedNetwork6(server_selector,
                                               shared_network->getName()));
    };

    test_delete("all servers", ServerSelector::ALL(), shared_network1);
    test_delete("any server", ServerSelector::ANY(), shared_network2);
    test_delete("one server", ServerSelector::ONE("server1"), shared_network3);
}

void
GenericConfigBackendDHCPv6Test::deleteSharedNetwork6SelectorsTest() {
    // Supported selectors.
    ASSERT_NO_THROW_LOG(cbptr_->deleteSharedNetwork6(ServerSelector::ANY(), "level1"));
    ASSERT_NO_THROW_LOG(cbptr_->deleteSharedNetwork6(ServerSelector::ALL(), "level1"));
    ASSERT_NO_THROW_LOG(cbptr_->deleteSharedNetwork6(ServerSelector::ONE("server1"), "level1"));

    // Not supported selectors.
    ASSERT_THROW(cbptr_->deleteSharedNetwork6(ServerSelector::MULTIPLE({ "server1", "server2" }),
                                              "level1"),
                 isc::InvalidOperation);

    // Not implemented selectors.
    ASSERT_THROW(cbptr_->deleteSharedNetwork6(ServerSelector::UNASSIGNED(), "level1"),
                 isc::NotImplemented);
}

void
GenericConfigBackendDHCPv6Test::deleteAllSharedNetworks6SelectorsTest() {
    // Supported selectors.
    ASSERT_NO_THROW_LOG(cbptr_->deleteAllSharedNetworks6(ServerSelector::UNASSIGNED()));
    ASSERT_NO_THROW_LOG(cbptr_->deleteAllSharedNetworks6(ServerSelector::ALL()));
    ASSERT_NO_THROW_LOG(cbptr_->deleteAllSharedNetworks6(ServerSelector::ONE("server1")));

    // Not supported selectors.
    ASSERT_THROW(cbptr_->deleteAllSharedNetworks6(ServerSelector::ANY()),
                 isc::InvalidOperation);
    ASSERT_THROW(cbptr_->deleteAllSharedNetworks6(ServerSelector::MULTIPLE({ "server1", "server2" })),
                 isc::InvalidOperation);
}

void
GenericConfigBackendDHCPv6Test::unassignedSharedNetworkTest() {
    // Create the server.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));

    // Create the shared networks and associate them with the server1.
    auto shared_network = test_networks_[0];
    auto shared_network2 = test_networks_[2];
    ASSERT_NO_THROW_LOG(
        cbptr_->createUpdateSharedNetwork6(ServerSelector::ONE("server1"), shared_network)
    );
    ASSERT_NO_THROW_LOG(
        cbptr_->createUpdateSharedNetwork6(ServerSelector::ONE("server1"), shared_network2)
    );

    // Delete the server. The shared networks should be preserved but are
    // considered orphaned, i.e. do not belong to any server.
    uint64_t deleted_count = 0;
    ASSERT_NO_THROW_LOG(deleted_count = cbptr_->deleteServer6(ServerTag("server1")));
    EXPECT_EQ(1, deleted_count);

    // Trying to fetch this shared network by server tag should return no result.
    SharedNetwork6Ptr returned_network;
    ASSERT_NO_THROW_LOG(returned_network = cbptr_->getSharedNetwork6(ServerSelector::ONE("server1"),
                                                                     "level1"));
    EXPECT_FALSE(returned_network);

    // The same if we use other calls.
    SharedNetwork6Collection returned_networks;
    ASSERT_NO_THROW_LOG(
        returned_networks = cbptr_->getAllSharedNetworks6(ServerSelector::ONE("server1"))
    );
    EXPECT_TRUE(returned_networks.empty());

    ASSERT_NO_THROW_LOG(
        returned_networks = cbptr_->getModifiedSharedNetworks6(ServerSelector::ONE("server1"),
                                                               timestamps_["two days ago"])
    );
    EXPECT_TRUE(returned_networks.empty());

    // We should get the shared network if we ask for unassigned.
    ASSERT_NO_THROW_LOG(returned_network = cbptr_->getSharedNetwork6(ServerSelector::UNASSIGNED(),
                                                                     "level1"));
    ASSERT_TRUE(returned_network);

    // Also if we ask for all unassigned networks it should be returned.
    ASSERT_NO_THROW_LOG(returned_networks = cbptr_->getAllSharedNetworks6(ServerSelector::UNASSIGNED()));
    ASSERT_EQ(2, returned_networks.size());

    // And all modified.
    ASSERT_NO_THROW_LOG(
        returned_networks = cbptr_->getModifiedSharedNetworks6(ServerSelector::UNASSIGNED(),
                                                               timestamps_["two days ago"])
    );
    ASSERT_EQ(2, returned_networks.size());

    // If we ask for any network by name, it should be returned too.
    ASSERT_NO_THROW_LOG(returned_network = cbptr_->getSharedNetwork6(ServerSelector::ANY(),
                                                                     "level1"));
    ASSERT_TRUE(returned_network);

    // Deleting a shared network with the mismatched server tag should not affect
    // our shared network.
    ASSERT_NO_THROW_LOG(
        deleted_count = cbptr_->deleteSharedNetwork6(ServerSelector::ONE("server1"),
                                                     "level1")
    );
    EXPECT_EQ(0, deleted_count);

    // Also, if we delete all shared networks for server1.
    ASSERT_NO_THROW_LOG(
        deleted_count = cbptr_->deleteAllSharedNetworks6(ServerSelector::ONE("server1"))
    );
    EXPECT_EQ(0, deleted_count);

    // We can delete this shared network when we specify ANY and the matching name.
    ASSERT_NO_THROW_LOG(
        deleted_count = cbptr_->deleteSharedNetwork6(ServerSelector::ANY(), "level1")
    );
    EXPECT_EQ(1, deleted_count);

    // We can delete all networks using UNASSIGNED selector.
    ASSERT_NO_THROW_LOG(
        deleted_count = cbptr_->deleteAllSharedNetworks6(ServerSelector::UNASSIGNED());
    );
    EXPECT_EQ(1, deleted_count);
}

void
GenericConfigBackendDHCPv6Test::sharedNetworkLifetimeTest() {
    // Insert new shared network with unspecified valid lifetime
    SharedNetwork6Ptr network(new SharedNetwork6("foo"));
    Triplet<uint32_t> unspecified;
    network->setPreferred(unspecified);
    network->setValid(unspecified);
    network->setIface("eth1");
    cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(), network);

    // Fetch this shared network.
    SharedNetwork6Ptr returned_network =
        cbptr_->getSharedNetwork6(ServerSelector::ALL(), "foo");
    ASSERT_TRUE(returned_network);

    // Verified returned and original shared networks match.
    EXPECT_EQ(network->toElement()->str(),
              returned_network->toElement()->str());

    // Update the preferred and valid lifetime.
    network->setPreferred( Triplet<uint32_t>(100, 200, 300));
    network->setValid( Triplet<uint32_t>(200, 300, 400));
    cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(), network);

    // Fetch and verify again.
    returned_network = cbptr_->getSharedNetwork6(ServerSelector::ALL(), "foo");
    ASSERT_TRUE(returned_network);
    EXPECT_EQ(network->toElement()->str(),
              returned_network->toElement()->str());
}

void
GenericConfigBackendDHCPv6Test::sharedNetworkOptionsTest() {
    // Add shared network with three options.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(), test_networks_[0]));
    EXPECT_EQ(3, countRows("dhcp6_options"));

    // Add another shared network with a single option. The numnber of options in the
    // database should now be 4.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(), test_networks_[2]));
    EXPECT_EQ(4, countRows("dhcp6_options"));

    // The second shared network uses the same name as the first shared network, so
    // this operation should replace the existing shared network and its options.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(), test_networks_[1]));
    EXPECT_EQ(1, countRows("dhcp6_options"));

    // Remove the shared network. This should not affect options assigned to the
    // other shared network.
    ASSERT_NO_THROW_LOG(cbptr_->deleteSharedNetwork6(ServerSelector::ALL(),
                                                     test_networks_[1]->getName()));
    EXPECT_EQ(1, countRows("dhcp6_shared_network"));
    EXPECT_EQ(1, countRows("dhcp6_options"));

    // Create the first option again. The number of options should be equal to the
    // sum of options associated with both shared networks.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(), test_networks_[0]));
    EXPECT_EQ(4, countRows("dhcp6_options"));

    // Delete this shared network. This should not affect the option associated
    // with the remaining shared network.
    ASSERT_NO_THROW_LOG(cbptr_->deleteSharedNetwork6(ServerSelector::ALL(),
                                                     test_networks_[0]->getName()));
    EXPECT_EQ(1, countRows("dhcp6_shared_network"));
    EXPECT_EQ(1, countRows("dhcp6_options"));
}

void
GenericConfigBackendDHCPv6Test::getOptionDef6Test() {
    // Insert new option definition.
    OptionDefinitionPtr option_def = test_option_defs_[0];
    cbptr_->createUpdateOptionDef6(ServerSelector::ALL(), option_def);

    // Fetch this option_definition by subnet identifier.
    OptionDefinitionPtr returned_option_def =
        cbptr_->getOptionDef6(ServerSelector::ALL(),
                              test_option_defs_[0]->getCode(),
                              test_option_defs_[0]->getOptionSpaceName());
    ASSERT_TRUE(returned_option_def);
    EXPECT_GT(returned_option_def->getId(), 0);
    ASSERT_EQ(1, returned_option_def->getServerTags().size());
    EXPECT_EQ("all", returned_option_def->getServerTags().begin()->get());

    EXPECT_TRUE(returned_option_def->equals(*option_def));

    {
        SCOPED_TRACE("CREATE audit entry for an option definition");
        testNewAuditEntry("dhcp6_option_def",
                          AuditEntry::ModificationType::CREATE,
                          "option definition set");
    }

    // Update the option definition in the database.
    OptionDefinitionPtr option_def2 = test_option_defs_[1];
    cbptr_->createUpdateOptionDef6(ServerSelector::ALL(), option_def2);

    // Fetch updated option definition and see if it matches.
    returned_option_def = cbptr_->getOptionDef6(ServerSelector::ALL(),
                                                test_option_defs_[1]->getCode(),
                                                test_option_defs_[1]->getOptionSpaceName());
    EXPECT_TRUE(returned_option_def->equals(*option_def2));

    // Fetching option definition for an explicitly specified server tag
    // should succeed too.
    returned_option_def = cbptr_->getOptionDef6(ServerSelector::ONE("server1"),
                                                test_option_defs_[1]->getCode(),
                                                test_option_defs_[1]->getOptionSpaceName());
    EXPECT_TRUE(returned_option_def->equals(*option_def2));

    {
        SCOPED_TRACE("UPDATE audit entry for an option definition");
        testNewAuditEntry("dhcp6_option_def",
                          AuditEntry::ModificationType::UPDATE,
                          "option definition set");
    }
}

void
GenericConfigBackendDHCPv6Test::optionDefs6WithServerTagsTest() {
    OptionDefinitionPtr option1 = test_option_defs_[0];
    OptionDefinitionPtr option2 = test_option_defs_[1];
    OptionDefinitionPtr option3 = test_option_defs_[4];

    // An attempt to create option definition for non-existing server should
    // fail.
    ASSERT_THROW(cbptr_->createUpdateOptionDef6(ServerSelector::ONE("server1"),
                                                option1),
                 NullKeyError);

    // Create two servers.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[1]));
    {
        SCOPED_TRACE("server1 is created");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));
    {
        SCOPED_TRACE("server2 is created");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    // This time creation of the option definition for the server1 should pass.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateOptionDef6(ServerSelector::ONE("server1"),
                                                       option1));
    {
        SCOPED_TRACE("option definition for server1 is set");
        // The value of 3 means there should be 3 audit entries available for the
        // server1, two that indicate creation of the servers and one that we
        // validate, which sets the option definition.
        testNewAuditEntry("dhcp6_option_def",
                          AuditEntry::ModificationType::CREATE,
                          "option definition set",
                          ServerSelector::ONE("server1"),
                          3, 1);
    }

    // Creation of the option definition for the server2 should also pass.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateOptionDef6(ServerSelector::ONE("server2"),
                                                       option2));
    {
        SCOPED_TRACE("option definition for server2 is set");
        // Same as in case of the server1, there should be 3 audit entries and
        // we validate one of them.
        testNewAuditEntry("dhcp6_option_def",
                          AuditEntry::ModificationType::CREATE,
                          "option definition set",
                          ServerSelector::ONE("server2"),
                          3, 1);
    }

    // Finally, creation of the option definition for all servers should
    // also pass.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateOptionDef6(ServerSelector::ALL(),
                                                       option3));
    {
        SCOPED_TRACE("option definition for server2 is set");
        // There should be one new audit entry for all servers. It logs
        // the insertion of the option definition.
        testNewAuditEntry("dhcp6_option_def",
                          AuditEntry::ModificationType::CREATE,
                          "option definition set",
                          ServerSelector::ALL(),
                          1, 1);
    }

    OptionDefinitionPtr returned_option_def;

    // Try to fetch the option definition specified for all servers. It should
    // return the third one.
    ASSERT_NO_THROW_LOG(
        returned_option_def = cbptr_->getOptionDef6(ServerSelector::ALL(),
                                                    option3->getCode(),
                                                    option3->getOptionSpaceName())
    );
    ASSERT_TRUE(returned_option_def);
    EXPECT_TRUE(returned_option_def->equals(*option3));

    // Try to fetch the option definition specified for server1. It should
    // override the definition for all servers.
    ASSERT_NO_THROW_LOG(
        returned_option_def = cbptr_->getOptionDef6(ServerSelector::ONE("server1"),
                                                    option1->getCode(),
                                                    option1->getOptionSpaceName())
    );
    ASSERT_TRUE(returned_option_def);
    EXPECT_TRUE(returned_option_def->equals(*option1));

    // The same in case of the server2.
    ASSERT_NO_THROW_LOG(
        returned_option_def = cbptr_->getOptionDef6(ServerSelector::ONE("server2"),
                                                    option2->getCode(),
                                                    option2->getOptionSpaceName())
    );
    ASSERT_TRUE(returned_option_def);
    EXPECT_TRUE(returned_option_def->equals(*option2));

    OptionDefContainer returned_option_defs;

    // Try to fetch the collection of the option definitions for server1, server2
    // and server3. The server3 does not have an explicit option definition, so
    // for this server we should get the definition associated with "all" servers.
    ASSERT_NO_THROW_LOG(
        returned_option_defs = cbptr_->getAllOptionDefs6(ServerSelector::
                                                         MULTIPLE({ "server1", "server2",
                                                                    "server3" }));
    );
    ASSERT_EQ(3, returned_option_defs.size());

    // Check that expected option definitions have been returned.
    auto current_option = returned_option_defs.begin();
    EXPECT_TRUE((*current_option)->equals(*option1));
    EXPECT_TRUE((*(++current_option))->equals(*option2));
    EXPECT_TRUE((*(++current_option))->equals(*option3));

    // Try to fetch the collection of options specified for all servers.
    // This excludes the options specific to server1 and server2. It returns
    // only the common ones.
    ASSERT_NO_THROW_LOG(
        returned_option_defs = cbptr_->getAllOptionDefs6(ServerSelector::ALL());

    );
    ASSERT_EQ(1, returned_option_defs.size());
    EXPECT_TRUE((*returned_option_defs.begin())->equals(*option3));

    // Delete the server1. It should remove associations of this server with the
    // option definitions and the option definition itself.
    ASSERT_NO_THROW_LOG(cbptr_->deleteServer6(ServerTag("server1")));
    ASSERT_NO_THROW_LOG(
        returned_option_defs = cbptr_->getAllOptionDefs6(ServerSelector::ONE("server1"));

    );
    ASSERT_EQ(1, returned_option_defs.size());
    EXPECT_TRUE((*returned_option_defs.begin())->equals(*option3));

    {
        SCOPED_TRACE("DELETE audit entry for the option definition after server deletion");
        testNewAuditEntry("dhcp6_option_def",
                          AuditEntry::ModificationType::DELETE,
                          "deleting a server", ServerSelector::ONE("server1"),
                          2, 1);
    }

    // Attempt to delete option definition for server1.
    uint64_t deleted_num = 0;
    ASSERT_NO_THROW_LOG(deleted_num = cbptr_->deleteOptionDef6(ServerSelector::ONE("server1"),
                                                               option1->getCode(),
                                                               option1->getOptionSpaceName()));
    EXPECT_EQ(0, deleted_num);

    // Deleting the existing option definition for server2 should succeed.
    ASSERT_NO_THROW_LOG(deleted_num = cbptr_->deleteOptionDef6(ServerSelector::ONE("server2"),
                                                               option2->getCode(),
                                                               option2->getOptionSpaceName()));
    EXPECT_EQ(1, deleted_num);

    // Create this option definition again to test that deletion of all servers
    // removes it too.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateOptionDef6(ServerSelector::ONE("server2"),
                                                       option2));

    // Delete all servers, except 'all'.
    ASSERT_NO_THROW_LOG(deleted_num = cbptr_->deleteAllServers6());
    ASSERT_NO_THROW_LOG(
        returned_option_defs = cbptr_->getAllOptionDefs6(ServerSelector::ALL());
    );
    EXPECT_EQ(1, deleted_num);
    EXPECT_EQ(1, returned_option_defs.size());
    EXPECT_TRUE((*returned_option_defs.begin())->equals(*option3));

    {
        SCOPED_TRACE("DELETE audit entry for the option definition after deletion of"
                     " all servers");
        testNewAuditEntry("dhcp6_option_def",
                          AuditEntry::ModificationType::DELETE,
                          "deleting all servers", ServerSelector::ONE("server2"),
                          4, 1);
    }
}

void
GenericConfigBackendDHCPv6Test::invalidOptionDefDataType6Test() {
    OptionDefinitionPtr test_def;
    ASSERT_NO_THROW_LOG(test_def.reset(new OptionDefinition("foobar", 234, DHCP6_OPTION_SPACE,
                                                            "unknown", true)));
    ASSERT_TRUE(test_def);
    ASSERT_THROW(cbptr_->createUpdateOptionDef6(ServerSelector::ALL(), test_def),
                 DbOperationError);
}

void
GenericConfigBackendDHCPv6Test::allOptionDefDataTypes6Test() {

    OptionDefListParser parser(AF_INET);
    std::string defs_str = R"([
    {
        "name": "my-empty", "code": 221, "type": "empty", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-binary", "code": 222, "type": "binary", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-boolean", "code": 223, "type": "boolean", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-int8", "code": 224, "type": "int8", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-int16", "code": 225, "type": "int16", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-int32", "code": 226, "type": "int32", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-uint8", "code": 227, "type": "uint8", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-uint16", "code": 228, "type": "uint16", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-uint32", "code": 229, "type": "uint32", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-ipv4-address", "code": 230, "type": "ipv4-address", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-ipv6-address", "code": 231, "type": "ipv6-address", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-ipv6-prefix", "code": 232, "type": "ipv6-prefix", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-psid", "code": 233, "type": "psid", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-string", "code": 234, "type": "string", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-tuple", "code": 235, "type": "tuple", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-fqdn", "code": 236, "type": "fqdn", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-internal", "code": 237, "type": "internal", "array": false,
        "record-types": "", "space": "dhcp6", "encapsulate": ""
    },
    {
        "name": "my-record", "code": 238, "type": "record", "array": false,
        "record-types": "uint8, uint8", "space": "dhcp6", "encapsulate": ""
    }
    ])";

    ConstElementPtr defs_elem;
    ASSERT_NO_THROW_LOG(defs_elem = Element::fromJSON(defs_str));

    CfgOptionDefPtr storage(new CfgOptionDef());
    ASSERT_NO_THROW_LOG(parser.parse(storage, defs_elem));

    auto test_defs = storage->getAll("dhcp6");
    ASSERT_EQ(test_defs->size(), 18);

    // Insert each option definition into the database.
    for (auto const& test_def : *test_defs) {
        ASSERT_NO_THROW_LOG(cbptr_->createUpdateOptionDef6(ServerSelector::ALL(), test_def));
        auto found_def = cbptr_->getOptionDef6(ServerSelector::ALL(),
                                               test_def->getCode(), "dhcp6");

        ASSERT_TRUE(found_def) << "no option found for " << test_def->getName();
        ASSERT_EQ(*found_def, *test_def);
    }
}

void
GenericConfigBackendDHCPv6Test::getAllOptionDefs6Test() {
    // Insert test option definitions into the database. Note that the second
    // option definition will overwrite the first option definition as they use
    // the same code and space.
    size_t updates_num = 0;
    for (auto const& option_def : test_option_defs_) {
        cbptr_->createUpdateOptionDef6(ServerSelector::ALL(), option_def);

        // That option definition overrides the first one so the audit entry should
        // indicate an update.
        auto name = option_def->getName();
        if (name.find("bar") != std::string::npos) {
            SCOPED_TRACE("UPDATE audit entry for the option definition " + name);
            testNewAuditEntry("dhcp6_option_def",
                              AuditEntry::ModificationType::UPDATE,
                              "option definition set");
            ++updates_num;

        } else {
            SCOPED_TRACE("CREATE audit entry for the option definition " + name);
            testNewAuditEntry("dhcp6_option_def",
                              AuditEntry::ModificationType::CREATE,
                              "option definition set");
        }
    }

    // Fetch all option_definitions.
    OptionDefContainer option_defs = cbptr_->getAllOptionDefs6(ServerSelector::ALL());
    ASSERT_EQ(test_option_defs_.size() - updates_num, option_defs.size());

    // All option definitions should also be returned for explicitly specified
    // server tag.
    option_defs = cbptr_->getAllOptionDefs6(ServerSelector::ONE("server1"));
    ASSERT_EQ(test_option_defs_.size() - updates_num, option_defs.size());

    // See if option definitions are returned ok.
    for (auto const& def : option_defs) {
        ASSERT_EQ(1, def->getServerTags().size());
        EXPECT_EQ("all", def->getServerTags().begin()->get());
        bool success = false;
        for (unsigned i = 1; i < test_option_defs_.size(); ++i) {
            if (def->equals(*test_option_defs_[i])) {
                success = true;
            }
        }
        ASSERT_TRUE(success) << "failed for option definition " << def->getCode()
            << ", option space " << def->getOptionSpaceName();
    }

    // Deleting non-existing option definition should return 0.
    EXPECT_EQ(0, cbptr_->deleteOptionDef6(ServerSelector::ALL(),
                                          99, "non-exiting-space"));
    // All option definitions should be still there.
    ASSERT_EQ(test_option_defs_.size() - updates_num, option_defs.size());

    // Should not delete option definition for explicit server tag
    // because our option definition is for all servers.
    EXPECT_EQ(0, cbptr_->deleteOptionDef6(ServerSelector::ONE("server1"),
                                          test_option_defs_[1]->getCode(),
                                          test_option_defs_[1]->getOptionSpaceName()));

    // Same for all option definitions.
    EXPECT_EQ(0, cbptr_->deleteAllOptionDefs6(ServerSelector::ONE("server1")));

    // Delete one of the option definitions and see if it is gone.
    EXPECT_EQ(1, cbptr_->deleteOptionDef6(ServerSelector::ALL(),
                                          test_option_defs_[2]->getCode(),
                                          test_option_defs_[2]->getOptionSpaceName()));
    ASSERT_FALSE(cbptr_->getOptionDef6(ServerSelector::ALL(),
                                       test_option_defs_[2]->getCode(),
                                       test_option_defs_[2]->getOptionSpaceName()));

    {
        SCOPED_TRACE("DELETE audit entry for the first option definition");
        testNewAuditEntry("dhcp6_option_def",
                          AuditEntry::ModificationType::DELETE,
                          "option definition deleted");
    }

    // Delete all remaining option definitions.
    EXPECT_EQ(2, cbptr_->deleteAllOptionDefs6(ServerSelector::ALL()));
    option_defs = cbptr_->getAllOptionDefs6(ServerSelector::ALL());
    ASSERT_TRUE(option_defs.empty());

    {
        SCOPED_TRACE("DELETE audit entries for the remaining option definitions");
        // The last parameter indicates that we expect two new audit entries.
        testNewAuditEntry("dhcp6_option_def",
                          AuditEntry::ModificationType::DELETE,
                          "deleted all option definitions",
                          ServerSelector::ALL(), 2);
    }
}

void
GenericConfigBackendDHCPv6Test::getModifiedOptionDefs6Test() {
    // Explicitly set timestamps of option definitions. First option
    // definition has a timestamp pointing to the future. Second option
    // definition has timestamp pointing to the past (yesterday).
    // Third option definitions has a timestamp pointing to the
    // past (an hour ago).
    test_option_defs_[1]->setModificationTime(timestamps_["tomorrow"]);
    test_option_defs_[2]->setModificationTime(timestamps_["yesterday"]);
    test_option_defs_[3]->setModificationTime(timestamps_["today"]);

    // Insert option definitions into the database.
    for (unsigned i = 1; i < test_networks_.size(); ++i) {
        cbptr_->createUpdateOptionDef6(ServerSelector::ALL(),
                                       test_option_defs_[i]);
    }

    // Fetch option definitions with timestamp later than today. Only one
    // option definition should be returned.
    OptionDefContainer
        option_defs = cbptr_->getModifiedOptionDefs6(ServerSelector::ALL(),
                                                     timestamps_["after today"]);
    ASSERT_EQ(1, option_defs.size());

    // Fetch option definitions with timestamp later than yesterday. We
    // should get two option definitions.
    option_defs = cbptr_->getModifiedOptionDefs6(ServerSelector::ALL(),
                                                 timestamps_["after yesterday"]);
    ASSERT_EQ(2, option_defs.size());

    // Fetch option definitions with timestamp later than tomorrow. Nothing
    // should be returned.
    option_defs = cbptr_->getModifiedOptionDefs6(ServerSelector::ALL(),
                                              timestamps_["after tomorrow"]);
    ASSERT_TRUE(option_defs.empty());
}

void
GenericConfigBackendDHCPv6Test::createUpdateDeleteOption6Test() {
    // Add option to the database.
    OptionDescriptorPtr opt_posix_timezone = test_options_[0];
    cbptr_->createUpdateOption6(ServerSelector::ALL(),
                                opt_posix_timezone);

    // Make sure we can retrieve this option and that it is equal to the
    // option we have inserted into the database.
    OptionDescriptorPtr returned_opt_posix_timezone =
        cbptr_->getOption6(ServerSelector::ALL(),
                           opt_posix_timezone->option_->getType(),
                           opt_posix_timezone->space_name_);
    ASSERT_TRUE(returned_opt_posix_timezone);

    {
        SCOPED_TRACE("verify created option");
        testOptionsEquivalent(*opt_posix_timezone,
                              *returned_opt_posix_timezone);
    }

    {
        SCOPED_TRACE("CREATE audit entry for an option");
        testNewAuditEntry("dhcp6_options",
                          AuditEntry::ModificationType::CREATE,
                          "global option set");
    }

    // Modify option and update it in the database.
    opt_posix_timezone->persistent_ = !opt_posix_timezone->persistent_;
    opt_posix_timezone->cancelled_ = !opt_posix_timezone->cancelled_;
    cbptr_->createUpdateOption6(ServerSelector::ALL(),
                                opt_posix_timezone);

    // Retrieve the option again and make sure that updates were
    // properly propagated to the database. Use explicit server selector
    // which should also return this option.
    returned_opt_posix_timezone = cbptr_->getOption6(ServerSelector::ONE("server1"),
                                                     opt_posix_timezone->option_->getType(),
                                                     opt_posix_timezone->space_name_);
    ASSERT_TRUE(returned_opt_posix_timezone);

    {
        SCOPED_TRACE("verify updated option");
        testOptionsEquivalent(*opt_posix_timezone,
                              *returned_opt_posix_timezone);
    }

    {
        SCOPED_TRACE("UPDATE audit entry for an option");
        testNewAuditEntry("dhcp6_options",
                          AuditEntry::ModificationType::UPDATE,
                          "global option set");
    }

    // Deleting an option with explicitly specified server tag should fail.
    EXPECT_EQ(0, cbptr_->deleteOption6(ServerSelector::ONE("server1"),
                                       opt_posix_timezone->option_->getType(),
                                       opt_posix_timezone->space_name_));

    // Deleting option for all servers should succeed.
    EXPECT_EQ(1, cbptr_->deleteOption6(ServerSelector::ALL(),
                                       opt_posix_timezone->option_->getType(),
                                       opt_posix_timezone->space_name_));

    EXPECT_FALSE(cbptr_->getOption6(ServerSelector::ALL(),
                                    opt_posix_timezone->option_->getType(),
                                    opt_posix_timezone->space_name_));

    {
        SCOPED_TRACE("DELETE audit entry for an option");
        testNewAuditEntry("dhcp6_options",
                          AuditEntry::ModificationType::DELETE,
                          "global option deleted");
    }
}

void
GenericConfigBackendDHCPv6Test::globalOptions6WithServerTagsTest() {
    // Create test options without any client classes.
    OptionDescriptorPtr opt_timezone1(new OptionDescriptor(*test_options_[0]));
    opt_timezone1->client_classes_.clear();
    OptionDescriptorPtr opt_timezone2(new OptionDescriptor(*test_options_[6]));
    opt_timezone2->client_classes_.clear();
    OptionDescriptorPtr opt_timezone3(new OptionDescriptor(*test_options_[7]));
    opt_timezone3->client_classes_.clear();

    ASSERT_THROW(cbptr_->createUpdateOption6(ServerSelector::ONE("server1"),
                                             opt_timezone1),
                 NullKeyError);

    // Create two servers.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[1]));
    {
        SCOPED_TRACE("server1 is created");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));
    {
        SCOPED_TRACE("server2 is created");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set");
    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateOption6(ServerSelector::ONE("server1"),
                                                    opt_timezone1));
    {
        SCOPED_TRACE("global option for server1 is set");
        // The value of 3 means there should be 3 audit entries available for the
        // server1, two that indicate creation of the servers and one that we
        // validate, which sets the global option.
        testNewAuditEntry("dhcp6_options",
                          AuditEntry::ModificationType::CREATE,
                          "global option set",
                          ServerSelector::ONE("server1"),
                          3, 1);

    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateOption6(ServerSelector::ONE("server2"),
                                                    opt_timezone2));
    {
        SCOPED_TRACE("global option for server2 is set");
        // Same as in case of the server1, there should be 3 audit entries and
        // we validate one of them.
        testNewAuditEntry("dhcp6_options",
                          AuditEntry::ModificationType::CREATE,
                          "global option set",
                          ServerSelector::ONE("server2"),
                          3, 1);

    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateOption6(ServerSelector::ALL(),
                                                    opt_timezone3));
    {
        SCOPED_TRACE("global option for all servers is set");
        // There should be one new audit entry for all servers. It logs
        // the insertion of the global option.
        testNewAuditEntry("dhcp6_options",
                          AuditEntry::ModificationType::CREATE,
                          "global option set",
                          ServerSelector::ALL(),
                          1, 1);

    }

    OptionDescriptorPtr returned_option;

    // Try to fetch the option specified for all servers. It should return
    // the third option.
    ASSERT_NO_THROW_LOG(
        returned_option = cbptr_->getOption6(ServerSelector::ALL(),
                                             opt_timezone3->option_->getType(),
                                             opt_timezone3->space_name_);
    );
    ASSERT_TRUE(returned_option);
    testOptionsEquivalent(*opt_timezone3, *returned_option);

    // Try to fetch the option specified for the server1. It should override the
    // option specified for all servers.
    ASSERT_NO_THROW_LOG(
        returned_option = cbptr_->getOption6(ServerSelector::ONE("server1"),
                                             opt_timezone1->option_->getType(),
                                             opt_timezone1->space_name_);
    );
    ASSERT_TRUE(returned_option);
    testOptionsEquivalent(*opt_timezone1, *returned_option);

    // The same in case of the server2.
    ASSERT_NO_THROW_LOG(
        returned_option = cbptr_->getOption6(ServerSelector::ONE("server2"),
                                             opt_timezone2->option_->getType(),
                                             opt_timezone2->space_name_);
    );
    ASSERT_TRUE(returned_option);
    testOptionsEquivalent(*opt_timezone2, *returned_option);

    OptionContainer returned_options;

    // Try to fetch the collection of global options for the server1, server2
    // and server3. The server3 does not have an explicit value so for this server
    // we should get the option associated with "all" servers.
    ASSERT_NO_THROW_LOG(
        returned_options = cbptr_->getAllOptions6(ServerSelector::
                                                  MULTIPLE({ "server1", "server2",
                                                             "server3" }));
    );
    ASSERT_EQ(3, returned_options.size());

    // Check that expected options have been returned.
    auto current_option = returned_options.begin();
    testOptionsEquivalent(*opt_timezone1, *current_option);
    testOptionsEquivalent(*opt_timezone2, *(++current_option));
    testOptionsEquivalent(*opt_timezone3, *(++current_option));

    // Try to fetch the collection of options specified for all servers.
    // This excludes the options specific to server1 and server2. It returns
    // only the common ones.
    ASSERT_NO_THROW_LOG(
        returned_options = cbptr_->getAllOptions6(ServerSelector::ALL());
    );
    ASSERT_EQ(1, returned_options.size());
    testOptionsEquivalent(*opt_timezone3, *returned_options.begin());

    // Delete the server1. It should remove associations of this server with the
    // option and the option itself.
    ASSERT_NO_THROW_LOG(cbptr_->deleteServer6(ServerTag("server1")));
    ASSERT_NO_THROW_LOG(
        returned_options = cbptr_->getAllOptions6(ServerSelector::ONE("server1"));
    );
    ASSERT_EQ(1, returned_options.size());
    testOptionsEquivalent(*opt_timezone3, *returned_options.begin());

    {
        SCOPED_TRACE("DELETE audit entry for the global option after server deletion");
        testNewAuditEntry("dhcp6_options",
                          AuditEntry::ModificationType::DELETE,
                          "deleting a server", ServerSelector::ONE("server1"),
                          2, 1);
    }

    // Attempt to delete global option for server1.
    uint64_t deleted_num = 0;
    ASSERT_NO_THROW_LOG(deleted_num = cbptr_->deleteOption6(ServerSelector::ONE("server1"),
                                                            opt_timezone1->option_->getType(),
                                                            opt_timezone1->space_name_));
    EXPECT_EQ(0, deleted_num);

    // Deleting the existing option for server2 should succeed.
    ASSERT_NO_THROW_LOG(deleted_num = cbptr_->deleteOption6(ServerSelector::ONE("server2"),
                                                            opt_timezone2->option_->getType(),
                                                            opt_timezone2->space_name_));
    EXPECT_EQ(1, deleted_num);

    // Create this option again to test that deletion of all servers removes it too.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateOption6(ServerSelector::ONE("server2"),
                                                    opt_timezone2));

    // Delete all servers, except 'all'.
    ASSERT_NO_THROW_LOG(deleted_num = cbptr_->deleteAllServers6());
    ASSERT_NO_THROW_LOG(
        returned_options = cbptr_->getAllOptions6(ServerSelector::ALL());
    );
    EXPECT_EQ(1, deleted_num);
    ASSERT_EQ(1, returned_options.size());
    testOptionsEquivalent(*opt_timezone3, *returned_options.begin());

    {
        SCOPED_TRACE("DELETE audit entry for the global option after deletion of"
                     " all servers");
        testNewAuditEntry("dhcp6_options",
                          AuditEntry::ModificationType::DELETE,
                          "deleting all servers", ServerSelector::ONE("server2"),
                          4, 1);
    }
}

void
GenericConfigBackendDHCPv6Test::getAllOptions6Test() {
    // Add three global options to the database.
    cbptr_->createUpdateOption6(ServerSelector::ALL(),
                                test_options_[0]);
    cbptr_->createUpdateOption6(ServerSelector::ALL(),
                                test_options_[1]);
    cbptr_->createUpdateOption6(ServerSelector::ALL(),
                                test_options_[5]);

    // Retrieve all these options.
    OptionContainer returned_options = cbptr_->getAllOptions6(ServerSelector::ALL());
    ASSERT_EQ(3, returned_options.size());

    // Fetching global options with explicitly specified server tag should return
    // the same result.
    returned_options = cbptr_->getAllOptions6(ServerSelector::ONE("server1"));
    ASSERT_EQ(3, returned_options.size());

    // Get the container index used to search options by option code.
    const OptionContainerTypeIndex& index = returned_options.get<1>();

    // Verify that all options we put into the database were
    // returned.
    {
        SCOPED_TRACE("verify test_options_[0]");
        auto option0 = index.find(test_options_[0]->option_->getType());
        ASSERT_FALSE(option0 == index.end());
        testOptionsEquivalent(*test_options_[0], *option0);
        EXPECT_GT(option0->getId(), 0);
        ASSERT_EQ(1, option0->getServerTags().size());
        EXPECT_EQ("all", option0->getServerTags().begin()->get());
    }

    {
        SCOPED_TRACE("verify test_options_[1]");
        auto option1 = index.find(test_options_[1]->option_->getType());
        ASSERT_FALSE(option1 == index.end());
        testOptionsEquivalent(*test_options_[1], *option1);
        EXPECT_GT(option1->getId(), 0);
        ASSERT_EQ(1, option1->getServerTags().size());
        EXPECT_EQ("all", option1->getServerTags().begin()->get());
    }

    {
        SCOPED_TRACE("verify test_options_[5]");
        auto option5 = index.find(test_options_[5]->option_->getType());
        ASSERT_FALSE(option5 == index.end());
        testOptionsEquivalent(*test_options_[5], *option5);
        EXPECT_GT(option5->getId(), 0);
        ASSERT_EQ(1, option5->getServerTags().size());
        EXPECT_EQ("all", option5->getServerTags().begin()->get());
    }
}

void
GenericConfigBackendDHCPv6Test::getModifiedOptions6Test() {
    // Assign timestamps to the options we're going to store in the
    // database.
    test_options_[0]->setModificationTime(timestamps_["tomorrow"]);
    test_options_[1]->setModificationTime(timestamps_["yesterday"]);
    test_options_[5]->setModificationTime(timestamps_["today"]);

    // Put options into the database.
    cbptr_->createUpdateOption6(ServerSelector::ALL(),
                                test_options_[0]);
    cbptr_->createUpdateOption6(ServerSelector::ALL(),
                                test_options_[1]);
    cbptr_->createUpdateOption6(ServerSelector::ALL(),
                                test_options_[5]);

    // Get options with the timestamp later than today. Only
    // one option should be returned.
    OptionContainer returned_options =
        cbptr_->getModifiedOptions6(ServerSelector::ALL(),
                                    timestamps_["after today"]);
    ASSERT_EQ(1, returned_options.size());

    // Fetching modified options with explicitly specified server selector
    // should return the same result.
    returned_options = cbptr_->getModifiedOptions6(ServerSelector::ONE("server1"),
                                                   timestamps_["after today"]);
    ASSERT_EQ(1, returned_options.size());

    // The returned option should be the one with the timestamp
    // set to tomorrow.
    const OptionContainerTypeIndex& index = returned_options.get<1>();
    auto option0 = index.find(test_options_[0]->option_->getType());
    ASSERT_FALSE(option0 == index.end());
    {
        SCOPED_TRACE("verify returned option");
        testOptionsEquivalent(*test_options_[0], *option0);
    }
}

std::list<OptionDescriptorPtr>
GenericConfigBackendDHCPv6Test::makeClassTaggedOptions() {
    // Describes an option to create.
    struct OptData {
        uint16_t code_;
        std::string value_;
        std::string cclass_;
    };

    // List of options to create.
    // Using timezone options as they are handy string options.
    std::list<OptData> opts_to_make =  {
        { D6O_NEW_TZDB_TIMEZONE,   "T100", "cc-one"   },
        { D6O_NEW_POSIX_TIMEZONE,  "P100", "cc-one"   },
        { D6O_NEW_POSIX_TIMEZONE,  "P300", ""         },
        { D6O_NEW_TZDB_TIMEZONE,   "T200", ""         },
        { D6O_NEW_POSIX_TIMEZONE,  "P200", "cc-two"   }
    };

    std::list<OptionDescriptorPtr> tagged_options;
    for (auto const& opt_to_make : opts_to_make) {
        OptionDescriptor desc = createOption<OptionString>(Option::V6, opt_to_make.code_,
                                                           true, false, false, opt_to_make.value_);
        desc.space_name_ = DHCP6_OPTION_SPACE;
        if (!opt_to_make.cclass_.empty()) {
            desc.addClientClass(opt_to_make.cclass_);
        }

        tagged_options.push_back(OptionDescriptorPtr(new OptionDescriptor(desc)));
    }

    return (tagged_options);
}

void
GenericConfigBackendDHCPv6Test::updateClassTaggedOptions(
    std::list<OptionDescriptorPtr>& options) {
    for (auto& desc : options) {
        OptionStringPtr opt = boost::dynamic_pointer_cast<OptionString>(desc->option_);
        ASSERT_TRUE(opt);
        std::string new_value(opt->getValue() + std::string(".") + opt->getValue());
        opt->setValue(new_value);
    }
}

// Macro the make SCOPED_TRACE around equivalance function more compact and helpful.
#define SCOPED_OPT_COMPARE(exp_opt,test_opt)\
{\
    std::stringstream oss;\
    oss << "Options not equal:\n"\
        << "  exp_opt: " << exp_opt.option_->toText() << "\n"\
        << " test_opt: " << (test_opt.option_ ? test_opt.option_->toText() : "<null>") << "\n";\
    SCOPED_TRACE(oss.str());\
    testOptionsEquivalent(exp_opt,test_opt);\
}

// Verify that one can add multiple global instances of the same option code
// and that they can be distinguished via their client_classes.
void
GenericConfigBackendDHCPv6Test::globalOption6WithClientClassesTest() {
    // Add the options to global scope.
    auto ref_options = makeClassTaggedOptions();
    for (auto const& ref_option : ref_options) {
        // Add option to the config back end.
        cbptr_->createUpdateOption6(ServerSelector::ALL(), ref_option);
    }

    // Make sure that we can find each option.
    OptionDescriptorPtr found_option;
    for (auto const& ref_option : ref_options) {
        // Find the option by code and client_classes.
        found_option = cbptr_->getOption6(ServerSelector::ALL(),
                                          ref_option->option_->getType(),
                                          DHCP6_OPTION_SPACE,
                                          ref_option->copyClientClasses());
        ASSERT_TRUE(found_option) << "ref_option" << ref_option->option_->toText()
                                  << ", cc: " << ref_option->client_classes_.toText();
        SCOPED_OPT_COMPARE((*ref_option), (*found_option));
    }

    // Update the option values.
    updateClassTaggedOptions(ref_options);

    // Update each option in the backend.
    for (auto const& ref_option : ref_options) {
        // Update option in the config back end.
        cbptr_->createUpdateOption6(ServerSelector::ALL(), ref_option);

        // Fetch and verify the updated option.
        found_option = cbptr_->getOption6(ServerSelector::ALL(),
                                          ref_option->option_->getType(),
                                          DHCP6_OPTION_SPACE,
                                          ref_option->copyClientClasses());
        ASSERT_TRUE(found_option);
        SCOPED_OPT_COMPARE((*ref_option), (*found_option));
    }

    // Delete each option from the backend.
    for (auto const& ref_option : ref_options) {
        ClientClassesPtr cclasses = ref_option->copyClientClasses();

        // Delete the option by code and client_classes.
        ASSERT_EQ(1, cbptr_->deleteOption6(ServerSelector::ALL(),
                                           ref_option->option_->getType(),
                                           DHCP6_OPTION_SPACE,
                                           cclasses));

        // Finding the option by code and client_classes should fail.
        found_option = cbptr_->getOption6(ServerSelector::ALL(),
                                          ref_option->option_->getType(),
                                          DHCP6_OPTION_SPACE,
                                          cclasses);
        ASSERT_FALSE(found_option);
    }
}

void
GenericConfigBackendDHCPv6Test::getAllOptions6WithClientClassesTest() {
    // Describes an option to create.
    struct OptData {
        uint16_t code_;
        uint32_t value_;
        std::string cclass_;
        ServerSelector server_;
    };

    auto server1 = ServerSelector::ONE("server1");
    auto server2 = ServerSelector::ONE("server2");
    auto all = ServerSelector::ALL();
    // List of options to create.
    std::list<OptData> opts_to_make = {
        { 231,  1, "cc-1", server1 },
        { 231,  2, "cc-2", server1 },
        { 232,  3, "cc-3", server1 },
        { 232,  4, "cc-3", server2 },
        { 233,  5, "cc-4", server1 },
        { 233,  6, "cc-4", all },
        { 234,  7, "cc-5", all }
    };

    // Create two servers.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[1]));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));

    // Add all of the global options.
    std::vector<OptionDescriptorPtr> ref_options;
    for (auto const& opt_to_make : opts_to_make) {
        OptionDescriptor desc = createOption<OptionInt<uint32_t>>(Option::V6, opt_to_make.code_,
                                                                  true, false, false, opt_to_make.value_);
        desc.space_name_ = DHCP6_OPTION_SPACE;
        if (!opt_to_make.cclass_.empty()) {
            desc.addClientClass(opt_to_make.cclass_);
        }

        ref_options.push_back(OptionDescriptorPtr(new OptionDescriptor(desc)));
        ASSERT_NO_THROW_LOG(cbptr_->createUpdateOption6(opt_to_make.server_, ref_options.back()));
    }

    // Try to fetch the collection of global options for the server1.
    // Build list of options we expect to get back.
    std::vector<OptionDescriptorPtr> exp_options;
    exp_options.push_back(ref_options[0]);
    exp_options.push_back(ref_options[1]);
    exp_options.push_back(ref_options[2]);
    exp_options.push_back(ref_options[4]);
    exp_options.push_back(ref_options[6]);

    OptionContainer returned_options;
    ASSERT_NO_THROW_LOG(returned_options = cbptr_->getAllOptions6(server1));
    ASSERT_EQ(returned_options.size(), exp_options.size());
    auto exp_option = exp_options.begin();
    for (auto returned_option : returned_options) {
        testOptionsEquivalent(*(*exp_option), returned_option);
        ++exp_option;
    }

    // Try to fetch the collection of global options for the server2.
    // Build list of options we expect to get back.
    exp_options.clear();
    exp_options.push_back(ref_options[3]);
    exp_options.push_back(ref_options[5]);
    exp_options.push_back(ref_options[6]);

    ASSERT_NO_THROW_LOG(returned_options = cbptr_->getAllOptions6(server2));
    ASSERT_EQ(returned_options.size(), exp_options.size());
    exp_option = exp_options.begin();
    for (auto returned_option : returned_options) {
        testOptionsEquivalent(*(*exp_option), returned_option);
        ++exp_option;
    }

    // Try to fetch the collection of global options for the server1.
    // Build list of options we expect to get back.
    exp_options.clear();
    exp_options.push_back(ref_options[5]);
    exp_options.push_back(ref_options[6]);

    ASSERT_NO_THROW_LOG(returned_options = cbptr_->getAllOptions6(all));
    ASSERT_EQ(returned_options.size(), exp_options.size());
    exp_option = exp_options.begin();
    for (auto returned_option : returned_options) {
        testOptionsEquivalent(*(*exp_option), returned_option);
        ++exp_option;
    }
}

void
GenericConfigBackendDHCPv6Test::createUpdateDeleteSubnetOption6Test() {
    // Insert new subnet.
    Subnet6Ptr subnet = test_subnets_[1];
    cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet);

    // Fetch this subnet by subnet identifier.
    Subnet6Ptr returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                                    subnet->getID());
    ASSERT_TRUE(returned_subnet);

    {
        SCOPED_TRACE("CREATE audit entry for a new subnet");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::CREATE,
                          "subnet set");
    }

    // The inserted subnet contains four options.
    ASSERT_EQ(4, countRows("dhcp6_options"));

    OptionDescriptorPtr opt_posix_timezone = test_options_[0];
    cbptr_->createUpdateOption6(ServerSelector::ANY(), subnet->getID(),
                                opt_posix_timezone);

    returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                         subnet->getID());
    ASSERT_TRUE(returned_subnet);

    OptionDescriptor returned_opt_posix_timezone =
        returned_subnet->getCfgOption()->get(DHCP6_OPTION_SPACE, D6O_NEW_POSIX_TIMEZONE);
    ASSERT_TRUE(returned_opt_posix_timezone.option_);

    {
        SCOPED_TRACE("verify returned option");
        testOptionsEquivalent(*opt_posix_timezone, returned_opt_posix_timezone);
        EXPECT_GT(returned_opt_posix_timezone.getId(), 0);
    }

    {
        SCOPED_TRACE("UPDATE audit entry for an added subnet option");
        // Instead of adding an audit entry for an option we add an audit
        // entry for the entire subnet so as the server refreshes the
        // subnet with the new option. Note that the server doesn't
        // have means to retrieve only the newly added option.
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::UPDATE,
                          "subnet specific option set");
    }

    // We have added one option to the existing subnet. We should now have
    // five options.
    ASSERT_EQ(5, countRows("dhcp6_options"));

    opt_posix_timezone->persistent_ = !opt_posix_timezone->persistent_;
    opt_posix_timezone->cancelled_ = !opt_posix_timezone->cancelled_;
    cbptr_->createUpdateOption6(ServerSelector::ANY(), subnet->getID(),
                                opt_posix_timezone);

    returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                         subnet->getID());
    ASSERT_TRUE(returned_subnet);
    returned_opt_posix_timezone =
        returned_subnet->getCfgOption()->get(DHCP6_OPTION_SPACE, D6O_NEW_POSIX_TIMEZONE);
    ASSERT_TRUE(returned_opt_posix_timezone.option_);

    {
        SCOPED_TRACE("verify returned option with modified persistence");
        testOptionsEquivalent(*opt_posix_timezone, returned_opt_posix_timezone);
    }

    {
        SCOPED_TRACE("UPDATE audit entry for an updated subnet option");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::UPDATE,
                          "subnet specific option set");
    }

    // Updating the option should replace the existing instance with the new
    // instance. Therefore, we should still have five options.
    ASSERT_EQ(5, countRows("dhcp6_options"));

    // It should succeed for any server.
    EXPECT_EQ(1, cbptr_->deleteOption6(ServerSelector::ANY(), subnet->getID(),
                                       opt_posix_timezone->option_->getType(),
                                       opt_posix_timezone->space_name_,
                                       opt_posix_timezone->copyClientClasses()));

    returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                         subnet->getID());
    ASSERT_TRUE(returned_subnet);

    EXPECT_FALSE(returned_subnet->getCfgOption()->get(DHCP6_OPTION_SPACE, D6O_NEW_POSIX_TIMEZONE).option_);

    {
        SCOPED_TRACE("UPDATE audit entry for a deleted subnet option");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::UPDATE,
                          "subnet specific option deleted");
    }

    // We should have only four options after deleting one of them.
    ASSERT_EQ(4, countRows("dhcp6_options"));
}

void
GenericConfigBackendDHCPv6Test::createUpdateDeletePoolOption6Test() {
    // Insert new subnet.
    Subnet6Ptr subnet = test_subnets_[1];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet));

    {
        SCOPED_TRACE("CREATE audit entry for a subnet");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::CREATE,
                          "subnet set");
    }

    // Inserted subnet has four options.
    ASSERT_EQ(4, countRows("dhcp6_options"));

    // Add an option into the pool.
    const PoolPtr pool = subnet->getPool(Lease::TYPE_NA,
                                         IOAddress("2001:db8::10"));
    ASSERT_TRUE(pool);
    OptionDescriptorPtr opt_posix_timezone = test_options_[0];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateOption6(ServerSelector::ANY(),
                                                    pool->getFirstAddress(),
                                                    pool->getLastAddress(),
                                                    opt_posix_timezone));

    // Query for a subnet.
    Subnet6Ptr returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                                    subnet->getID());
    ASSERT_TRUE(returned_subnet);

    // The returned subnet should include our pool.
    const PoolPtr returned_pool = returned_subnet->getPool(Lease::TYPE_NA,
                                                           IOAddress("2001:db8::10"));
    ASSERT_TRUE(returned_pool);

    // The pool should contain option we added earlier.
    OptionDescriptor returned_opt_posix_timezone =
        returned_pool->getCfgOption()->get(DHCP6_OPTION_SPACE, D6O_NEW_POSIX_TIMEZONE);
    ASSERT_TRUE(returned_opt_posix_timezone.option_);

    {
        SCOPED_TRACE("verify returned pool option");
        testOptionsEquivalent(*opt_posix_timezone, returned_opt_posix_timezone);
        EXPECT_GT(returned_opt_posix_timezone.getId(), 0);
    }

    {
        SCOPED_TRACE("UPDATE audit entry for a subnet after adding an option "
                     "to the address pool");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::UPDATE,
                          "address pool specific option set");
    }

    // With the newly inserted option we should now have five options.
    ASSERT_EQ(5, countRows("dhcp6_options"));

    // Modify the option and update it in the database.
    opt_posix_timezone->persistent_ = !opt_posix_timezone->persistent_;
    opt_posix_timezone->cancelled_ = !opt_posix_timezone->cancelled_;
    cbptr_->createUpdateOption6(ServerSelector::ANY(),
                                pool->getFirstAddress(),
                                pool->getLastAddress(),
                                opt_posix_timezone);

    // Fetch the subnet and the corresponding pool.
    returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                         subnet->getID());
    ASSERT_TRUE(returned_subnet);
    const PoolPtr returned_pool1 = returned_subnet->getPool(Lease::TYPE_NA,
                                                            IOAddress("2001:db8::10"));
    ASSERT_TRUE(returned_pool1);

    // Test that the option has been correctly updated in the database.
    returned_opt_posix_timezone =
        returned_pool1->getCfgOption()->get(DHCP6_OPTION_SPACE, D6O_NEW_POSIX_TIMEZONE);
    ASSERT_TRUE(returned_opt_posix_timezone.option_);

    {
        SCOPED_TRACE("verify updated option with modified persistence");
        testOptionsEquivalent(*opt_posix_timezone, returned_opt_posix_timezone);
    }

    {
        SCOPED_TRACE("UPDATE audit entry for a subnet when updating "
                     "address  pool specific option");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::UPDATE,
                          "address pool specific option set");
    }

    // The new option instance should replace the existing one, so we should
    // still have five options.
    ASSERT_EQ(5, countRows("dhcp6_options"));

    // Delete option for any server should succeed.
    EXPECT_EQ(1, cbptr_->deleteOption6(ServerSelector::ANY(),
                                       pool->getFirstAddress(),
                                       pool->getLastAddress(),
                                       opt_posix_timezone->option_->getType(),
                                       opt_posix_timezone->space_name_));

    // Fetch the subnet and the pool from the database again to make sure
    // that the option is really gone.
    returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                         subnet->getID());
    ASSERT_TRUE(returned_subnet);
    const PoolPtr returned_pool2 = returned_subnet->getPool(Lease::TYPE_NA,
                                                            IOAddress("2001:db8::10"));
    ASSERT_TRUE(returned_pool2);

    // Option should be gone.
    EXPECT_FALSE(returned_pool2->getCfgOption()->get(DHCP6_OPTION_SPACE,
                                                     D6O_NEW_POSIX_TIMEZONE).option_);

    {
        SCOPED_TRACE("UPDATE audit entry for a subnet when deleting "
                     "address pool specific option");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::UPDATE,
                          "address pool specific option deleted");
    }

    // The option has been deleted so the number of options should now
    // be down to 4.
    EXPECT_EQ(4, countRows("dhcp6_options"));
}

void
GenericConfigBackendDHCPv6Test::createUpdateDeletePdPoolOption6Test() {
    // Insert new subnet.
    Subnet6Ptr subnet = test_subnets_[1];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet));

    {
        SCOPED_TRACE("CREATE audit entry for a subnet");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::CREATE,
                          "subnet set");
    }

    // Inserted subnet has four options.
    ASSERT_EQ(4, countRows("dhcp6_options"));

    // Add an option into the pd pool.
    const PoolPtr pd_pool = subnet->getPool(Lease::TYPE_PD,
                                            IOAddress("2001:db8:a:10::"));
    ASSERT_TRUE(pd_pool);
    OptionDescriptorPtr opt_posix_timezone = test_options_[0];
    int pd_pool_len = prefixLengthFromRange(pd_pool->getFirstAddress(),
                                            pd_pool->getLastAddress());
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateOption6(ServerSelector::ANY(),
                                                    pd_pool->getFirstAddress(),
                                                    static_cast<uint8_t>(pd_pool_len),
                                                    opt_posix_timezone));

    // Query for a subnet.
    Subnet6Ptr returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                                    subnet->getID());
    ASSERT_TRUE(returned_subnet);

    // The returned subnet should include our pool.
    const PoolPtr returned_pd_pool = returned_subnet->getPool(Lease::TYPE_PD,
                                                              IOAddress("2001:db8:a:10::"));
    ASSERT_TRUE(returned_pd_pool);

    // The pd pool should contain option we added earlier.
    OptionDescriptor returned_opt_posix_timezone =
        returned_pd_pool->getCfgOption()->get(DHCP6_OPTION_SPACE, D6O_NEW_POSIX_TIMEZONE);
    ASSERT_TRUE(returned_opt_posix_timezone.option_);

    {
        SCOPED_TRACE("verify returned pool option");
        testOptionsEquivalent(*opt_posix_timezone, returned_opt_posix_timezone);
        EXPECT_GT(returned_opt_posix_timezone.getId(), 0);
    }

    {
        SCOPED_TRACE("UPDATE audit entry for a subnet after adding an option "
                     "to the prefix delegation pool");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::UPDATE,
                          "prefix delegation pool specific option set");
    }

    // With the newly inserted option we should now have five options.
    ASSERT_EQ(5, countRows("dhcp6_options"));

    // Modify the option and update it in the database.
    opt_posix_timezone->persistent_ = !opt_posix_timezone->persistent_;
    opt_posix_timezone->cancelled_ = !opt_posix_timezone->cancelled_;
    cbptr_->createUpdateOption6(ServerSelector::ANY(),
                                pd_pool->getFirstAddress(),
                                static_cast<uint8_t>(pd_pool_len),
                                opt_posix_timezone);

    // Fetch the subnet and the corresponding pd pool.
    returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                         subnet->getID());
    ASSERT_TRUE(returned_subnet);
    const PoolPtr returned_pd_pool1 = returned_subnet->getPool(Lease::TYPE_PD,
                                                               IOAddress("2001:db8:a:10::"));
    ASSERT_TRUE(returned_pd_pool1);

    // Test that the option has been correctly updated in the database.
    returned_opt_posix_timezone =
        returned_pd_pool1->getCfgOption()->get(DHCP6_OPTION_SPACE, D6O_NEW_POSIX_TIMEZONE);
    ASSERT_TRUE(returned_opt_posix_timezone.option_);

    {
        SCOPED_TRACE("verify updated option with modified persistence");
        testOptionsEquivalent(*opt_posix_timezone, returned_opt_posix_timezone);
    }

    {
        SCOPED_TRACE("UPDATE audit entry for a subnet when updating "
                     "prefix delegation pool specific option");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::UPDATE,
                          "prefix delegation pool specific option set");
    }

    // The new option instance should replace the existing one, so we should
    // still have five options.
    ASSERT_EQ(5, countRows("dhcp6_options"));

    // Delete option for any server should succeed.
    EXPECT_EQ(1, cbptr_->deleteOption6(ServerSelector::ANY(),
                                       pd_pool->getFirstAddress(),
                                       static_cast<uint8_t>(pd_pool_len),
                                       opt_posix_timezone->option_->getType(),
                                       opt_posix_timezone->space_name_));

    // Fetch the subnet and the pool from the database again to make sure
    // that the option is really gone.
    returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                         subnet->getID());
    ASSERT_TRUE(returned_subnet);
    const PoolPtr returned_pd_pool2 = returned_subnet->getPool(Lease::TYPE_PD,
                                                               IOAddress("2001:db8:a:10::"));
    ASSERT_TRUE(returned_pd_pool2);

    // Option should be gone.
    EXPECT_FALSE(returned_pd_pool2->getCfgOption()->get(DHCP6_OPTION_SPACE,
                                                        D6O_NEW_POSIX_TIMEZONE).option_);

    {
        SCOPED_TRACE("UPDATE audit entry for a subnet when deleting "
                     "prefix delegation pool specific option");
        testNewAuditEntry("dhcp6_subnet",
                          AuditEntry::ModificationType::UPDATE,
                          "prefix delegation pool specific option deleted");
    }

    // The option has been deleted so the number of options should now
    // be down to 4.
    EXPECT_EQ(4, countRows("dhcp6_options"));
}

void
GenericConfigBackendDHCPv6Test::createUpdateDeleteSharedNetworkOption6Test() {
    // Insert new shared network.
    SharedNetwork6Ptr shared_network = test_networks_[1];
    cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(),
                                       shared_network);

    // Fetch this shared network by name.
    SharedNetwork6Ptr returned_network =
        cbptr_->getSharedNetwork6(ServerSelector::ALL(),
                                  shared_network->getName());
    ASSERT_TRUE(returned_network);

    {
        SCOPED_TRACE("CREATE audit entry for the new shared network");
        testNewAuditEntry("dhcp6_shared_network",
                          AuditEntry::ModificationType::CREATE,
                          "shared network set");
    }

    // The inserted shared network has no options.
    ASSERT_EQ(0, countRows("dhcp6_options"));

    OptionDescriptorPtr opt_posix_timezone = test_options_[0];
    cbptr_->createUpdateOption6(ServerSelector::ANY(),
                                shared_network->getName(),
                                opt_posix_timezone);

    returned_network = cbptr_->getSharedNetwork6(ServerSelector::ALL(),
                                                 shared_network->getName());
    ASSERT_TRUE(returned_network);

    OptionDescriptor returned_opt_posix_timezone =
        returned_network->getCfgOption()->get(DHCP6_OPTION_SPACE, D6O_NEW_POSIX_TIMEZONE);
    ASSERT_TRUE(returned_opt_posix_timezone.option_);

    {
        SCOPED_TRACE("verify returned option");
        testOptionsEquivalent(*opt_posix_timezone, returned_opt_posix_timezone);
        EXPECT_GT(returned_opt_posix_timezone.getId(), 0);
    }

    {
        SCOPED_TRACE("UPDATE audit entry for the added shared network option");
        // Instead of adding an audit entry for an option we add an audit
        // entry for the entire shared network so as the server refreshes the
        // shared network with the new option. Note that the server doesn't
        // have means to retrieve only the newly added option.
        testNewAuditEntry("dhcp6_shared_network",
                          AuditEntry::ModificationType::UPDATE,
                          "shared network specific option set");
    }

    // One option should now be stored in the database.
    ASSERT_EQ(1, countRows("dhcp6_options"));

    opt_posix_timezone->persistent_ = !opt_posix_timezone->persistent_;
    opt_posix_timezone->cancelled_ = !opt_posix_timezone->cancelled_;
    cbptr_->createUpdateOption6(ServerSelector::ANY(),
                                shared_network->getName(),
                                opt_posix_timezone);

    returned_network = cbptr_->getSharedNetwork6(ServerSelector::ALL(),
                                                 shared_network->getName());
    ASSERT_TRUE(returned_network);
    returned_opt_posix_timezone =
        returned_network->getCfgOption()->get(DHCP6_OPTION_SPACE, D6O_NEW_POSIX_TIMEZONE);
    ASSERT_TRUE(returned_opt_posix_timezone.option_);

    {
        SCOPED_TRACE("verify updated option with modified persistence");
        testOptionsEquivalent(*opt_posix_timezone, returned_opt_posix_timezone);
    }

    {
        SCOPED_TRACE("UPDATE audit entry for the updated shared network option");
        testNewAuditEntry("dhcp6_shared_network",
                          AuditEntry::ModificationType::UPDATE,
                          "shared network specific option set");
    }

    // The new option instance should replace the existing option instance,
    // so we should still have one option.
    ASSERT_EQ(1, countRows("dhcp6_options"));

    // Deleting an option for any server should succeed.
    EXPECT_EQ(1, cbptr_->deleteOption6(ServerSelector::ANY(),
                                       shared_network->getName(),
                                       opt_posix_timezone->option_->getType(),
                                       opt_posix_timezone->space_name_));
    returned_network = cbptr_->getSharedNetwork6(ServerSelector::ALL(),
                                                 shared_network->getName());
    ASSERT_TRUE(returned_network);
    EXPECT_FALSE(returned_network->getCfgOption()->get(DHCP6_OPTION_SPACE, D6O_NEW_POSIX_TIMEZONE).option_);

    {
        SCOPED_TRACE("UPDATE audit entry for the deleted shared network option");
        testNewAuditEntry("dhcp6_shared_network",
                          AuditEntry::ModificationType::UPDATE,
                          "shared network specific option deleted");
    }

    // After deleting the option we should be back to 0.
    EXPECT_EQ(0, countRows("dhcp6_options"));
}

void
GenericConfigBackendDHCPv6Test::subnetOptionIdOrderTest() {

    // Add a subnet with two pools with two options each.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), test_subnets_[1]));
    EXPECT_EQ(2, countRows("dhcp6_pool"));
    EXPECT_EQ(4, countRows("dhcp6_options"));

    // Add a second subnet with a single option. The number of options in the database
    // should now be 3.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), test_subnets_[2]));
    EXPECT_EQ(2, countRows("dhcp6_pool"));
    EXPECT_EQ(5, countRows("dhcp6_options"));

    // Now replace the first subnet with three options and two pools.  This will cause
    // the option id values for this subnet to be larger than those in the second
    // subnet.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSubnet6(ServerSelector::ALL(), test_subnets_[0]));
    EXPECT_EQ(2, countRows("dhcp6_pool"));
    EXPECT_EQ(4, countRows("dhcp6_options"));

    // Now fetch all subnets.
    Subnet6Collection subnets;
    ASSERT_NO_THROW_LOG(subnets = cbptr_->getAllSubnets6(ServerSelector::ALL()));
    ASSERT_EQ(2, subnets.size());

    // Verify that the subnets returned are as expected.
    for (auto const& subnet : subnets) {
        ASSERT_EQ(1, subnet->getServerTags().size());
        EXPECT_EQ("all", subnet->getServerTags().begin()->get());
        if (subnet->getID() == 1024) {
            EXPECT_EQ(test_subnets_[0]->toElement()->str(), subnet->toElement()->str());
        } else if (subnet->getID() == 2048) {
            EXPECT_EQ(test_subnets_[2]->toElement()->str(), subnet->toElement()->str());
        } else {
            ADD_FAILURE() << "unexpected subnet id:" << subnet->getID();
        }
    }
}

void
GenericConfigBackendDHCPv6Test::sharedNetworkOptionIdOrderTest() {
    auto level1_options = test_networks_[0];
    auto level1_no_options = test_networks_[1];
    auto level2 = test_networks_[2];

    // Insert two shared networks. We insert level1 without options first,
    // then level2.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(),
                                                           level1_no_options));

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(),
                                                           level2));
    // Fetch all shared networks.
    SharedNetwork6Collection networks =
        cbptr_->getAllSharedNetworks6(ServerSelector::ALL());

    ASSERT_EQ(2, networks.size());

    // See if shared networks are returned ok.
    for (unsigned i = 0; i < networks.size(); ++i) {
        if (i == 0) {
            // level1_no_options
            EXPECT_EQ(level1_no_options->toElement()->str(),
                  networks[i]->toElement()->str());
        } else {
            // bar
            EXPECT_EQ(level2->toElement()->str(),
                  networks[i]->toElement()->str());
        }
    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(),
                                                           level1_options));

    // Fetch all shared networks.
    networks = cbptr_->getAllSharedNetworks6(ServerSelector::ALL());
    ASSERT_EQ(2, networks.size());

    // See if shared networks are returned ok.
    for (unsigned i = 0; i < networks.size(); ++i) {
        if (i == 0) {
            // level1_no_options
            EXPECT_EQ(level1_options->toElement()->str(),
                  networks[i]->toElement()->str());
        } else {
            // bar
            EXPECT_EQ(level2->toElement()->str(),
                  networks[i]->toElement()->str());
        }
    }
}

void
GenericConfigBackendDHCPv6Test::setAndGetAllClientClasses6Test() {
    // Create a server.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));
    {
        SCOPED_TRACE("server1 is created");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set",
                          ServerSelector::ONE("server1"));
    }
    // Create first class.
    auto class1 = test_client_classes_[0];
    class1->setTest("pkt6.msgtype == 1");
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class1, ""));
    {
        SCOPED_TRACE("client class foo is created");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::CREATE,
                          "client class set",
                          ServerSelector::ONE("server1"));
    }
    // Create second class.
    auto class2 = test_client_classes_[1];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ONE("server1"), class2, ""));
    {
        SCOPED_TRACE("client class bar is created");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::CREATE,
                          "client class set",
                          ServerSelector::ONE("server1"));
    }
    // Create third class.
    auto class3 = test_client_classes_[2];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ONE("server1"), class3, ""));
    {
        SCOPED_TRACE("client class foobar is created");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::CREATE,
                          "client class set",
                          ServerSelector::ONE("server1"));
    }
    // Update the third class to depend on the second class.
    class3->setTest("member('foo')");
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ONE("server1"), class3, ""));
    {
        SCOPED_TRACE("client class bar is updated");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::UPDATE,
                          "client class set",
                          ServerSelector::ONE("server1"));
    }
    // Only the first class should be returned for the server selector ALL.
    auto client_classes = cbptr_->getAllClientClasses6(ServerSelector::ALL());
    ASSERT_EQ(1, client_classes.getClasses()->size());
    // All three classes should be returned for the server1.
    client_classes = cbptr_->getAllClientClasses6(ServerSelector::ONE("server1"));
    auto classes_list = client_classes.getClasses();
    ASSERT_EQ(3, classes_list->size());

    auto fetched_class = classes_list->begin();
    ASSERT_EQ("foo", (*fetched_class)->getName());
    EXPECT_FALSE((*fetched_class)->getMatchExpr());
    EXPECT_EQ(class1->toElement()->str(), (*fetched_class)->toElement()->str());

    ++fetched_class;
    ASSERT_EQ("bar", (*fetched_class)->getName());
    EXPECT_FALSE((*fetched_class)->getMatchExpr());
    EXPECT_EQ(class2->toElement()->str(), (*fetched_class)->toElement()->str());

    ++fetched_class;
    ASSERT_EQ("foobar", (*fetched_class)->getName());
    EXPECT_FALSE((*fetched_class)->getMatchExpr());
    EXPECT_EQ(class3->toElement()->str(), (*fetched_class)->toElement()->str());

    // Move the third class between the first and second class.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ONE("server1"), class3, "foo"));

    // Ensure that the classes order has changed.
    client_classes = cbptr_->getAllClientClasses6(ServerSelector::ONE("server1"));
    classes_list = client_classes.getClasses();
    ASSERT_EQ(3, classes_list->size());
    EXPECT_EQ("foo", (*classes_list->begin())->getName());
    EXPECT_FALSE((*classes_list->begin())->getMatchExpr());
    EXPECT_EQ("foobar", (*(classes_list->begin() + 1))->getName());
    EXPECT_FALSE((*(classes_list->begin() + 1))->getMatchExpr());
    EXPECT_EQ("bar", (*(classes_list->begin() + 2))->getName());
    EXPECT_FALSE((*(classes_list->begin() + 2))->getMatchExpr());

    // Update the foobar class without specifying its position. It should not
    // be moved.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ONE("server1"), class3, ""));

    client_classes = cbptr_->getAllClientClasses6(ServerSelector::ONE("server1"));
    classes_list = client_classes.getClasses();
    ASSERT_EQ(3, classes_list->size());
    EXPECT_EQ("foo", (*classes_list->begin())->getName());
    EXPECT_FALSE((*classes_list->begin())->getMatchExpr());
    EXPECT_EQ("foobar", (*(classes_list->begin() + 1))->getName());
    EXPECT_FALSE((*(classes_list->begin() + 1))->getMatchExpr());
    EXPECT_EQ("bar", (*(classes_list->begin() + 2))->getName());
    EXPECT_FALSE((*(classes_list->begin() + 2))->getMatchExpr());
}

void
GenericConfigBackendDHCPv6Test::getClientClass6Test() {
    // Create a server.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));

    // Add classes.
    auto class1 = test_client_classes_[0];
    ASSERT_NO_THROW_LOG(class1->getCfgOption()->add(test_options_[0]->option_,
                                                    test_options_[0]->persistent_,
                                                    test_options_[0]->cancelled_,
                                                    test_options_[0]->space_name_));
    ASSERT_NO_THROW_LOG(class1->getCfgOption()->add(test_options_[1]->option_,
                                                    test_options_[1]->persistent_,
                                                    test_options_[1]->cancelled_,
                                                    test_options_[1]->space_name_));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class1, ""));

    auto class2 = test_client_classes_[1];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ONE("server1"), class2, ""));

    // Get the first client class and validate its contents.
    ClientClassDefPtr client_class;
    ASSERT_NO_THROW_LOG(client_class = cbptr_->getClientClass6(ServerSelector::ALL(), class1->getName()));
    ASSERT_TRUE(client_class);
    EXPECT_EQ("foo", client_class->getName());
    EXPECT_TRUE(client_class->getAdditional());
    EXPECT_EQ(30, client_class->getValid().getMin());
    EXPECT_EQ(60, client_class->getValid().get());
    EXPECT_EQ(90, client_class->getValid().getMax());
    EXPECT_EQ(25, client_class->getPreferred().getMin());
    EXPECT_EQ(55, client_class->getPreferred().get());
    EXPECT_EQ(85, client_class->getPreferred().getMax());

    // Validate options belonging to this class.
    ASSERT_TRUE(client_class->getCfgOption());
    OptionDescriptor returned_opt_new_posix_timezone =
        client_class->getCfgOption()->get(DHCP6_OPTION_SPACE, D6O_NEW_POSIX_TIMEZONE);
    ASSERT_TRUE(returned_opt_new_posix_timezone.option_);

    OptionDescriptor returned_opt_preference =
        client_class->getCfgOption()->get(DHCP6_OPTION_SPACE, D6O_PREFERENCE);
    ASSERT_TRUE(returned_opt_preference.option_);

    // Fetch the same class using different server selectors.
    ASSERT_NO_THROW_LOG(client_class = cbptr_->getClientClass6(ServerSelector::ANY(),
                                                               class1->getName()));
    EXPECT_TRUE(client_class);

    ASSERT_NO_THROW_LOG(client_class = cbptr_->getClientClass6(ServerSelector::ONE("server1"),
                                                               class1->getName()));
    EXPECT_TRUE(client_class);

    ASSERT_NO_THROW_LOG(client_class = cbptr_->getClientClass6(ServerSelector::UNASSIGNED(),
                                                               class1->getName()));
    EXPECT_FALSE(client_class);

    // Fetch the second client class using different selectors. This time the
    // class should not be returned for the ALL server selector because it is
    // associated with the server1.
    ASSERT_NO_THROW_LOG(client_class = cbptr_->getClientClass6(ServerSelector::ALL(),
                                                               class2->getName()));
    EXPECT_FALSE(client_class);

    ASSERT_NO_THROW_LOG(client_class = cbptr_->getClientClass6(ServerSelector::ANY(),
                                                               class2->getName()));
    EXPECT_TRUE(client_class);

    ASSERT_NO_THROW_LOG(client_class = cbptr_->getClientClass6(ServerSelector::ONE("server1"),
                                                               class2->getName()));
    EXPECT_TRUE(client_class);

    ASSERT_NO_THROW_LOG(client_class = cbptr_->getClientClass6(ServerSelector::UNASSIGNED(),
                                                               class2->getName()));
    EXPECT_FALSE(client_class);
}

void
GenericConfigBackendDHCPv6Test::createUpdateClientClass6OptionsTest() {
    // Add class with two options and two option definitions.
    auto class1 = test_client_classes_[0];
    ASSERT_NO_THROW_LOG(class1->getCfgOption()->add(test_options_[0]->option_,
                                                    test_options_[0]->persistent_,
                                                    test_options_[0]->cancelled_,
                                                    test_options_[0]->space_name_));
    ASSERT_NO_THROW_LOG(class1->getCfgOption()->add(test_options_[1]->option_,
                                                    test_options_[1]->persistent_,
                                                    test_options_[1]->cancelled_,
                                                    test_options_[1]->space_name_));
    auto cfg_option_def = boost::make_shared<CfgOptionDef>();
    class1->setCfgOptionDef(cfg_option_def);
    ASSERT_NO_THROW_LOG(class1->getCfgOptionDef()->add(test_option_defs_[0]));
    ASSERT_NO_THROW_LOG(class1->getCfgOptionDef()->add(test_option_defs_[2]));
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class1, ""));

    // Fetch the class and the options from the database.
    ClientClassDefPtr client_class;
    ASSERT_NO_THROW_LOG(client_class = cbptr_->getClientClass6(ServerSelector::ALL(), class1->getName()));
    ASSERT_TRUE(client_class);

    // Verify lifetime values.
    EXPECT_EQ(30, client_class->getValid().getMin());
    EXPECT_EQ(60, client_class->getValid().get());
    EXPECT_EQ(90, client_class->getValid().getMax());
    EXPECT_EQ(25, client_class->getPreferred().getMin());
    EXPECT_EQ(55, client_class->getPreferred().get());
    EXPECT_EQ(85, client_class->getPreferred().getMax());

    // Validate options belonging to the class.
    ASSERT_TRUE(client_class->getCfgOption());
    OptionDescriptor returned_opt_new_posix_timezone =
        client_class->getCfgOption()->get(DHCP6_OPTION_SPACE, D6O_NEW_POSIX_TIMEZONE);
    ASSERT_TRUE(returned_opt_new_posix_timezone.option_);

    OptionDescriptor returned_opt_preference =
        client_class->getCfgOption()->get(DHCP6_OPTION_SPACE, D6O_PREFERENCE);
    ASSERT_TRUE(returned_opt_preference.option_);

    // Validate option definitions belonging to the class.
    ASSERT_TRUE(client_class->getCfgOptionDef());
    auto returned_def_foo = client_class->getCfgOptionDef()->get(test_option_defs_[0]->getOptionSpaceName(),
                                                                 test_option_defs_[0]->getCode());
    ASSERT_TRUE(returned_def_foo);
    EXPECT_EQ(1234, returned_def_foo->getCode());
    EXPECT_EQ("foo", returned_def_foo->getName());
    EXPECT_EQ(DHCP6_OPTION_SPACE, returned_def_foo->getOptionSpaceName());
    EXPECT_EQ("espace", returned_def_foo->getEncapsulatedSpace());
    EXPECT_EQ(OPT_STRING_TYPE, returned_def_foo->getType());
    EXPECT_FALSE(returned_def_foo->getArrayType());

    auto returned_def_fish = client_class->getCfgOptionDef()->get(test_option_defs_[2]->getOptionSpaceName(),
                                                                  test_option_defs_[2]->getCode());
    ASSERT_TRUE(returned_def_fish);
    EXPECT_EQ(5235, returned_def_fish->getCode());
    EXPECT_EQ("fish", returned_def_fish->getName());
    EXPECT_EQ(DHCP6_OPTION_SPACE, returned_def_fish->getOptionSpaceName());
    EXPECT_TRUE(returned_def_fish->getEncapsulatedSpace().empty());
    EXPECT_EQ(OPT_RECORD_TYPE, returned_def_fish->getType());
    EXPECT_TRUE(returned_def_fish->getArrayType());

    // Replace client class specific option definitions. Leave only one option
    // definition.
    cfg_option_def = boost::make_shared<CfgOptionDef>();
    class1->setCfgOptionDef(cfg_option_def);
    ASSERT_NO_THROW_LOG(class1->getCfgOptionDef()->add(test_option_defs_[2]));

    // Delete one of the options and update the class.
    class1->getCfgOption()->del(test_options_[0]->space_name_,
                                test_options_[0]->option_->getType());
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class1, ""));
    ASSERT_NO_THROW_LOG(client_class = cbptr_->getClientClass6(ServerSelector::ALL(), class1->getName()));
    ASSERT_TRUE(client_class);

    // Re-check lifetime values. This ensure bindings line up.
    EXPECT_EQ(30, client_class->getValid().getMin());
    EXPECT_EQ(60, client_class->getValid().get());
    EXPECT_EQ(90, client_class->getValid().getMax());
    EXPECT_EQ(25, client_class->getPreferred().getMin());
    EXPECT_EQ(55, client_class->getPreferred().get());
    EXPECT_EQ(85, client_class->getPreferred().getMax());

    // Ensure that the first option definition is gone.
    ASSERT_TRUE(client_class->getCfgOptionDef());
    returned_def_foo = client_class->getCfgOptionDef()->get(test_option_defs_[0]->getOptionSpaceName(),
                                                            test_option_defs_[0]->getCode());
    EXPECT_FALSE(returned_def_foo);

    // The second option definition should be present.
    returned_def_fish = client_class->getCfgOptionDef()->get(test_option_defs_[2]->getOptionSpaceName(),
                                                             test_option_defs_[2]->getCode());
    EXPECT_TRUE(returned_def_fish);

    // Make sure that the first option is gone.
    ASSERT_TRUE(client_class->getCfgOption());
    returned_opt_new_posix_timezone = client_class->getCfgOption()->get(DHCP6_OPTION_SPACE,
                                                                        D6O_NEW_POSIX_TIMEZONE);
    EXPECT_FALSE(returned_opt_new_posix_timezone.option_);

    // The second option should be there.
    returned_opt_preference = client_class->getCfgOption()->get(DHCP6_OPTION_SPACE,
                                                                D6O_PREFERENCE);
    ASSERT_TRUE(returned_opt_preference.option_);
}

void
GenericConfigBackendDHCPv6Test::getModifiedClientClasses6Test() {
    // Create server1.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));

    // Add three classes to the database with different timestamps.
    auto class1 = test_client_classes_[0];
    class1->setModificationTime(timestamps_["yesterday"]);
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class1, ""));

    auto class2 = test_client_classes_[1];
    class2->setModificationTime(timestamps_["today"]);
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class2, ""));

    auto class3 = test_client_classes_[2];
    class3->setModificationTime(timestamps_["tomorrow"]);
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ONE("server1"), class3, ""));

    // Get modified client classes configured for all servers.
    auto client_classes = cbptr_->getModifiedClientClasses6(ServerSelector::ALL(),
                                                            timestamps_["two days ago"]);
    EXPECT_EQ(2, client_classes.getClasses()->size());

    // Get modified client classes appropriate for server1. It includes classes
    // for all servers and for the server1.
    client_classes = cbptr_->getModifiedClientClasses6(ServerSelector::ONE("server1"),
                                                       timestamps_["two days ago"]);
    EXPECT_EQ(3, client_classes.getClasses()->size());

    // Get the classes again but use the timestamp equal to the modification
    // time of the first class.
    client_classes = cbptr_->getModifiedClientClasses6(ServerSelector::ONE("server1"),
                                                       timestamps_["yesterday"]);
    EXPECT_EQ(3, client_classes.getClasses()->size());

    // Get modified classes starting from today. It should return only two.
    client_classes = cbptr_->getModifiedClientClasses6(ServerSelector::ONE("server1"),
                                                       timestamps_["today"]);
    EXPECT_EQ(2, client_classes.getClasses()->size());

    // Get client classes modified in the future. It should return none.
    client_classes = cbptr_->getModifiedClientClasses6(ServerSelector::ONE("server1"),
                                                       timestamps_["after tomorrow"]);
    EXPECT_EQ(0, client_classes.getClasses()->size());

    // Getting modified client classes for any server is unsupported.
    ASSERT_THROW(cbptr_->getModifiedClientClasses6(ServerSelector::ANY(),
                                                   timestamps_["two days ago"]),
                 InvalidOperation);
}

void
GenericConfigBackendDHCPv6Test::deleteClientClass6Test() {
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));
    {
        SCOPED_TRACE("server1 is created");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set",
                          ServerSelector::ONE("server1"));
    }
    {
        SCOPED_TRACE("server1 is created");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set",
                          ServerSelector::ONE("server2"));
    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));
    {
        SCOPED_TRACE("server1 is created and available for server1");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set",
                          ServerSelector::ONE("server1"));
    }
    {
        SCOPED_TRACE("server1 is created and available for server2");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set",
                          ServerSelector::ONE("server2"));
    }

    auto class1 = test_client_classes_[0];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class1, ""));
    {
        SCOPED_TRACE("client class foo is created and available for server1");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::CREATE,
                          "client class set",
                          ServerSelector::ONE("server1"));
    }
    {
        SCOPED_TRACE("client class foo is created and available for server 2");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::CREATE,
                          "client class set",
                          ServerSelector::ONE("server2"));
    }

    auto class2 = test_client_classes_[1];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ONE("server1"), class2, ""));
    {
        SCOPED_TRACE("client class bar is created");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::CREATE,
                          "client class set",
                          ServerSelector::ONE("server1"));
    }

    auto class3 = test_client_classes_[2];
    class3->setTest("member('foo')");
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ONE("server2"), class3, ""));
    {
        SCOPED_TRACE("client class foobar is created");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::CREATE,
                          "client class set",
                          ServerSelector::ONE("server2"));
    }

    uint64_t result;
    ASSERT_NO_THROW_LOG(result = cbptr_->deleteClientClass6(ServerSelector::ONE("server1"),
                                                            class2->getName()));
    EXPECT_EQ(1, result);
    {
        SCOPED_TRACE("client class bar is deleted");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::DELETE,
                          "client class deleted",
                          ServerSelector::ONE("server1"));
    }

    ASSERT_NO_THROW_LOG(result = cbptr_->deleteClientClass6(ServerSelector::ONE("server2"),
                                                            class3->getName()));
    EXPECT_EQ(1, result);
    {
        SCOPED_TRACE("client class foobar is deleted");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::DELETE,
                          "client class deleted",
                          ServerSelector::ONE("server2"));
    }

    ASSERT_NO_THROW_LOG(result = cbptr_->deleteClientClass6(ServerSelector::ANY(),
                                                            class1->getName()));
    EXPECT_EQ(1, result);
    {
        SCOPED_TRACE("client class foo is deleted and no longer available for the server1");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::DELETE,
                          "client class deleted",
                          ServerSelector::ONE("server1"));
    }
    {
        SCOPED_TRACE("client class foo is deleted and no longer available for the server2");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::DELETE,
                          "client class deleted",
                          ServerSelector::ONE("server2"));
    }
}

void
GenericConfigBackendDHCPv6Test::deleteAllClientClasses6Test() {
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));
    {
        SCOPED_TRACE("server1 is created");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set",
                          ServerSelector::ONE("server1"));
    }
    {
        SCOPED_TRACE("server1 is created");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set",
                          ServerSelector::ONE("server2"));
    }

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[2]));
    {
        SCOPED_TRACE("server1 is created and available for server1");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set",
                          ServerSelector::ONE("server1"));
    }
    {
        SCOPED_TRACE("server1 is created and available for server2");
        testNewAuditEntry("dhcp6_server",
                          AuditEntry::ModificationType::CREATE,
                          "server set",
                          ServerSelector::ONE("server2"));
    }

    auto class1 = test_client_classes_[0];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class1, ""));
    {
        SCOPED_TRACE("client class foo is created and available for server1");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::CREATE,
                          "client class set",
                          ServerSelector::ONE("server1"));
    }
    {
        SCOPED_TRACE("client class foo is created and available for server 2");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::CREATE,
                          "client class set",
                          ServerSelector::ONE("server2"));
    }

    auto class2 = test_client_classes_[1];
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ONE("server1"), class2, ""));
    {
        SCOPED_TRACE("client class bar is created");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::CREATE,
                          "client class set",
                          ServerSelector::ONE("server1"));
    }

    auto class3 = test_client_classes_[2];
    class3->setTest("member('foo')");
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ONE("server2"), class3, ""));
    {
        SCOPED_TRACE("client class foobar is created");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::CREATE,
                          "client class set",
                          ServerSelector::ONE("server2"));
    }

    uint64_t result;

    ASSERT_NO_THROW_LOG(result = cbptr_->deleteAllClientClasses6(ServerSelector::UNASSIGNED()));
    EXPECT_EQ(0, result);

    ASSERT_NO_THROW_LOG(result = cbptr_->deleteAllClientClasses6(ServerSelector::ONE("server2")));
    EXPECT_EQ(1, result);
    {
        SCOPED_TRACE("client classes for server2 deleted");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::DELETE,
                          "deleted all client classes",
                          ServerSelector::ONE("server2"));
    }

    ASSERT_NO_THROW_LOG(result = cbptr_->deleteAllClientClasses6(ServerSelector::ONE("server2")));
    EXPECT_EQ(0, result);

    ASSERT_NO_THROW_LOG(result = cbptr_->deleteAllClientClasses6(ServerSelector::ONE("server1")));
    EXPECT_EQ(1, result);
    {
        SCOPED_TRACE("client classes for server1 deleted");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::DELETE,
                          "deleted all client classes",
                          ServerSelector::ONE("server1"));
    }

    ASSERT_NO_THROW_LOG(result = cbptr_->deleteAllClientClasses6(ServerSelector::ONE("server1")));
    EXPECT_EQ(0, result);

    ASSERT_NO_THROW_LOG(result = cbptr_->deleteAllClientClasses6(ServerSelector::ALL()));
    EXPECT_EQ(1, result);
    {
        SCOPED_TRACE("client classes for all deleted");
        testNewAuditEntry("dhcp6_client_class",
                          AuditEntry::ModificationType::DELETE,
                          "deleted all client classes",
                          ServerSelector::ONE("server1"));
    }

    ASSERT_NO_THROW_LOG(result = cbptr_->deleteAllClientClasses6(ServerSelector::ALL()));
    EXPECT_EQ(0, result);

    // Deleting multiple objects using ANY server tag is unsupported.
    ASSERT_THROW(cbptr_->deleteAllClientClasses6(ServerSelector::ANY()), InvalidOperation);
}

void
GenericConfigBackendDHCPv6Test::clientClassDependencies6Test() {
    // Create a server.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[0]));

    // Create first class. It depends on KNOWN built-in class.
    auto class1 = test_client_classes_[0];
    class1->setTest("member('KNOWN')");
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class1, ""));

    // Create second class which depends on the first class. This yelds indirect
    // dependency on KNOWN class.
    auto class2 = test_client_classes_[1];
    class2->setTest("member('foo')");
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class2, ""));

    // Create third class depending on the second class. This also yelds indirect
    // dependency on KNOWN class.
    auto class3 = test_client_classes_[2];
    class3->setTest("member('bar')");
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class3, ""));

    // An attempt to move the first class to the end of the class hierarchy should
    // fail because other classes depend on it.
    ASSERT_THROW(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class1, "bar"),
                 DbOperationError);

    // Try to change the dependency of the first class. There are other classes
    // having indirect dependency on KNOWN class via this class. Therefore, the
    // update should be unsuccessful.
    class1->setTest("member('HA_server1')");
    ASSERT_THROW(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class1, ""),
                 DbOperationError);

    // Try to change the dependency of the second class. This should result in
    // an error because the third class depends on it.
    class2->setTest("member('HA_server1')");
    ASSERT_THROW(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class2, ""),
                 DbOperationError);

    // Changing the indirect dependency of the third class should succeed, because
    // no other classes depend on this class.
    class3->setTest("member('HA_server1')");
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateClientClass6(ServerSelector::ALL(), class3, ""));
}

void
GenericConfigBackendDHCPv6Test::multipleAuditEntriesTest() {
    // Get current time.
    boost::posix_time::ptime now = boost::posix_time::second_clock::local_time();

    // Create a server.
    ASSERT_NO_THROW_LOG(cbptr_->createUpdateServer6(test_servers_[1]));

    // Create a global parameter and update it many times.
    const ServerSelector& server_selector = ServerSelector::ALL();
    StampedValuePtr param;
    ElementPtr value;
    for (int i = 0; i < 100; ++i) {
        value = Element::create(i);
        param = StampedValue::create("my-parameter", value);
        cbptr_->createUpdateGlobalParameter6(server_selector, param);
    }

    // Get all audit entries from now.
    AuditEntryCollection audit_entries =
        cbptr_->getRecentAuditEntries(server_selector, now, 0);

    // Check that partial retrieves return the right count.
    auto& mod_time_idx = audit_entries.get<AuditEntryModificationTimeIdTag>();
    size_t distance = mod_time_idx.size();
    for (auto const& it : mod_time_idx) {
        size_t partial_size =
            cbptr_->getRecentAuditEntries(server_selector,
                                          it->getModificationTime(),
                                          it->getRevisionId()).size();
        EXPECT_EQ(partial_size + 1, distance);
        distance--;
    }
}

// Verify that one can add multiple instances of the same option code
// to a shared-network and that they can be distinguished via their client_classes.
void
GenericConfigBackendDHCPv6Test::sharedNetworkOption6WithClientClassesTest() {
    // Make a network with options.
    SharedNetwork6Ptr network(new SharedNetwork6("net1"));
    auto ref_options = makeClassTaggedOptions();
    for (auto const& ref_option : ref_options) {
        network->getCfgOption()->add(*ref_option, ref_option->space_name_);
    }

    // Add the network to config back end.
    cbptr_->createUpdateSharedNetwork6(ServerSelector::ALL(), network);

    // Fetch the network.
    SharedNetwork6Ptr returned_network = cbptr_->getSharedNetwork6(ServerSelector::ALL(),
                                                                   network->getName());
    ASSERT_TRUE(returned_network);

    // Make sure that CfgOption->get() with client_classes finds each ref option.
    for (auto const& ref_option : ref_options) {
        auto cfg_option = returned_network->getCfgOption()->get(DHCP6_OPTION_SPACE,
                                                                ref_option->option_->getType(),
                                                                ref_option->client_classes_);
        SCOPED_OPT_COMPARE((*ref_option), cfg_option);
    }

    // Now make sure that we can set the options individually.
    updateClassTaggedOptions(ref_options);
    for (auto const& ref_option : ref_options) {
        cbptr_->createUpdateOption6(ServerSelector::ALL(), network->getName(), ref_option);
    }

    // Re-fetch the network.
    returned_network = cbptr_->getSharedNetwork6(ServerSelector::ALL(), network->getName());
    ASSERT_TRUE(returned_network);

    // Make sure that CfgOption->get() with client_classes finds each ref option.
    for (auto const& ref_option : ref_options) {
        auto cfg_option = returned_network->getCfgOption()->get(DHCP6_OPTION_SPACE,
                                                                ref_option->option_->getType(),
                                                                ref_option->client_classes_);
        SCOPED_OPT_COMPARE((*ref_option), cfg_option);
    }

    // Now make sure that we can delete the options individually.
    for (auto const& ref_option : ref_options) {
        ASSERT_EQ(1, cbptr_->deleteOption6(ServerSelector::ANY(),
                                           network->getName(),
                                           ref_option->option_->getType(),
                                           DHCP6_OPTION_SPACE,
                                           ref_option->copyClientClasses()));
    }

    // Re-fetch the network.
    returned_network = cbptr_->getSharedNetwork6(ServerSelector::ALL(), network->getName());
    ASSERT_TRUE(returned_network);

    // Make sure that CfgOption is empty
    auto cfg_option = returned_network->getCfgOption()->getAll(DHCP6_OPTION_SPACE);
    EXPECT_TRUE(cfg_option->empty());
}

// Verify that one can add multiple instances of the same option code
// to a subnet and that they can be distinguished via their client_classes.
void
GenericConfigBackendDHCPv6Test::subnetOption6WithClientClassesTest() {
    // Make a subnet with options.
    Subnet6Ptr subnet(new Subnet6(IOAddress("2001:db8::"), 64,
                                  30, 40, 50, 60, 1024));
    auto ref_options = makeClassTaggedOptions();
    for (auto const& ref_option : ref_options) {
        subnet->getCfgOption()->add(*ref_option, ref_option->space_name_);
    }

    // Add the subnet to config back end.
    cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet);

    // Fetch the subnet.
    Subnet6Ptr returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(), subnet->getID());
    ASSERT_TRUE(returned_subnet);

    // Make sure that CfgOption->get() with client_classes finds each ref option.
    for (auto const& ref_option : ref_options) {
        auto cfg_option = returned_subnet->getCfgOption()->get(DHCP6_OPTION_SPACE,
                                                               ref_option->option_->getType(),
                                                               ref_option->client_classes_);
        SCOPED_OPT_COMPARE((*ref_option), cfg_option);
    }

    // Now make sure that we can set the options individually.
    updateClassTaggedOptions(ref_options);
    for (auto const& ref_option : ref_options) {
        cbptr_->createUpdateOption6(ServerSelector::ALL(), subnet->getID(), ref_option);
    }

    // Re-fetch the subnet.
    returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(), subnet->getID());
    ASSERT_TRUE(returned_subnet);

    // Make sure that CfgOption->get() with client_classes finds each ref option.
    for (auto const& ref_option : ref_options) {
        auto cfg_option = returned_subnet->getCfgOption()->get(DHCP6_OPTION_SPACE,
                                                               ref_option->option_->getType(),
                                                               ref_option->client_classes_);
        SCOPED_OPT_COMPARE((*ref_option), cfg_option);
    }

    // Now make sure that we can delete the options individually.
    for (auto const& ref_option : ref_options) {
        ASSERT_EQ(1, cbptr_->deleteOption6(ServerSelector::ANY(),
                                           subnet->getID(),
                                           ref_option->option_->getType(),
                                           DHCP6_OPTION_SPACE,
                                           ref_option->copyClientClasses()));
    }

    // Re-fetch the subnet.
    returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(), subnet->getID());
    ASSERT_TRUE(returned_subnet);

    // Make sure that CfgOption is empty
    auto cfg_option = returned_subnet->getCfgOption()->getAll(DHCP6_OPTION_SPACE);
    EXPECT_TRUE(cfg_option->empty());
}

// Verify that one can add multiple instances of the same option code
// to a pool and that they can be distinguished via their client_classes.
void
GenericConfigBackendDHCPv6Test::poolOption6WithClientClassesTest() {
    // Make subnet with a pool with options.
    Subnet6Ptr subnet(new Subnet6(IOAddress("2001:db8::"), 64,
                                  30, 40, 50, 60, 1024));

    Pool6Ptr pool(new Pool6(Lease::TYPE_NA,
                            IOAddress("2001:db8::10"), IOAddress("2001:db8::20")));
    subnet->addPool(pool);

    // Add the options to the pool.
    auto ref_options = makeClassTaggedOptions();
    for (auto const& ref_option : ref_options) {
        pool->getCfgOption()->add(*ref_option, ref_option->space_name_);
    }

    // Add the subnet to config back end.
    cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet);

    // Fetch this subnet by subnet identifier.
    Subnet6Ptr returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                                    subnet->getID());
    ASSERT_TRUE(returned_subnet);

    PoolPtr returned_pool = returned_subnet->getPool(Lease::TYPE_NA,
                                                     IOAddress("2001:db8::10"));
    ASSERT_TRUE(returned_pool);

    // Make sure that CfgOption->get() with client_classes finds each ref option.
    for (auto const& ref_option : ref_options) {
        auto cfg_option = returned_pool->getCfgOption()->get(DHCP6_OPTION_SPACE,
                                                             ref_option->option_->getType(),
                                                             ref_option->client_classes_);
        SCOPED_OPT_COMPARE((*ref_option), cfg_option);
    }

    // Now make sure that we can set the options individually.
    updateClassTaggedOptions(ref_options);

    for (auto const& ref_option : ref_options) {
        cbptr_->createUpdateOption6(ServerSelector::ALL(),
                                    pool->getFirstAddress(),
                                    pool->getLastAddress(),
                                    ref_option);
    }

    // Re-fetch the subnet.
    returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(), subnet->getID());
    ASSERT_TRUE(returned_subnet);

    returned_pool = returned_subnet->getPool(Lease::TYPE_NA,
                                             IOAddress("2001:db8::10"));
    ASSERT_TRUE(returned_pool);

    // Make sure that CfgOption->get() with client_classes finds each ref option.
    for (auto const& ref_option : ref_options) {
        auto cfg_option = returned_pool->getCfgOption()->get(DHCP6_OPTION_SPACE,
                                                             ref_option->option_->getType(),
                                                             ref_option->client_classes_);
        SCOPED_OPT_COMPARE((*ref_option), cfg_option);
    }

    // Now make sure that we can delete the options individually.
    for (auto const& ref_option : ref_options) {
        ASSERT_EQ(1, cbptr_->deleteOption6(ServerSelector::ANY(),
                                           pool->getFirstAddress(),
                                           pool->getLastAddress(),
                                           ref_option->option_->getType(),
                                           DHCP6_OPTION_SPACE,
                                           ref_option->copyClientClasses()));
    }

    // Re-fetch the subnet.
    returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(), subnet->getID());
    ASSERT_TRUE(returned_subnet);

    returned_pool = returned_subnet->getPool(Lease::TYPE_NA,
                                             IOAddress("2001:db8::10"));
    ASSERT_TRUE(returned_pool);

    // Make sure that CfgOption is empty
    auto cfg_option = returned_pool->getCfgOption()->getAll(DHCP6_OPTION_SPACE);
    EXPECT_TRUE(cfg_option->empty());
}

// Verify that one can add multiple instances of the same option code
// to a pd pool and that they can be distinguished via their client_classes.
void
GenericConfigBackendDHCPv6Test::pdPoolOption6WithClientClassesTest() {
    // Make subnet with a pool with options.
    Subnet6Ptr subnet(new Subnet6(IOAddress("2001:db8::"), 64,
                                  30, 40, 50, 60, 1024));

    const PoolPtr pool(new Pool6(Lease::TYPE_PD,
                                 IOAddress("2001:db8:a::"), 48, 64));
    auto pool_len = prefixLengthFromRange(pool->getFirstAddress(),
                                          pool->getLastAddress());
    subnet->addPool(pool);

    // Add the options to the pool.
    auto ref_options = makeClassTaggedOptions();
    for (auto const& ref_option : ref_options) {
        pool->getCfgOption()->add(*ref_option, ref_option->space_name_);
    }

    // Add the subnet to config back end.
    cbptr_->createUpdateSubnet6(ServerSelector::ALL(), subnet);

    // Fetch this subnet by subnet identifier.
    Subnet6Ptr returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(),
                                                    subnet->getID());
    ASSERT_TRUE(returned_subnet);

    PoolPtr returned_pool = returned_subnet->getPool(Lease::TYPE_PD,
                                                     IOAddress("2001:db8:a::"));
    ASSERT_TRUE(returned_pool);

    // Make sure that CfgOption->get() with client_classes finds each ref option.
    for (auto const& ref_option : ref_options) {
        auto cfg_option = returned_pool->getCfgOption()->get(DHCP6_OPTION_SPACE,
                                                             ref_option->option_->getType(),
                                                             ref_option->client_classes_);
        SCOPED_OPT_COMPARE((*ref_option), cfg_option);
    }

    // Now make sure that we can set the options individually.
    updateClassTaggedOptions(ref_options);

    for (auto const& ref_option : ref_options) {
        cbptr_->createUpdateOption6(ServerSelector::ALL(),
                                    pool->getFirstAddress(),
                                    static_cast<uint8_t>(pool_len),
                                    ref_option);
    }

    // Re-fetch the subnet.
    returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(), subnet->getID());
    ASSERT_TRUE(returned_subnet);

    returned_pool = returned_subnet->getPool(Lease::TYPE_PD,
                                             IOAddress("2001:db8:a::"));
    ASSERT_TRUE(returned_pool);

    // Make sure that CfgOption->get() with client_classes finds each ref option.
    for (auto const& ref_option : ref_options) {
        auto cfg_option = returned_pool->getCfgOption()->get(DHCP6_OPTION_SPACE,
                                                             ref_option->option_->getType(),
                                                             ref_option->client_classes_);
        SCOPED_OPT_COMPARE((*ref_option), cfg_option);
    }

    // Now make sure that we can delete the options individually.
    for (auto const& ref_option : ref_options) {
        ASSERT_EQ(1, cbptr_->deleteOption6(ServerSelector::ANY(),
                                           pool->getFirstAddress(),
                                           static_cast<uint8_t>(pool_len),
                                           ref_option->option_->getType(),
                                           DHCP6_OPTION_SPACE,
                                           ref_option->copyClientClasses()));
    }

    // Re-fetch the subnet.
    returned_subnet = cbptr_->getSubnet6(ServerSelector::ALL(), subnet->getID());
    ASSERT_TRUE(returned_subnet);

    returned_pool = returned_subnet->getPool(Lease::TYPE_PD,
                                             IOAddress("2001:db8:a::"));
    ASSERT_TRUE(returned_pool);

    // Make sure that CfgOption is empty
    auto cfg_option = returned_pool->getCfgOption()->getAll(DHCP6_OPTION_SPACE);
    EXPECT_TRUE(cfg_option->empty());
}

void
GenericConfigBackendDHCPv6Test::optionDef6DeleteForceTest() {
    /// @brief This test verifies that option definition delete:
    /// 1. Does not delete a definition if the force parameter is omitted and a
    /// dependent option exists.
    /// 2. Does not delete a definition if the force parameter is false and a
    /// dependent option exists.
    /// 3. Deletes a definition if the force parameter is true and a
    /// dependent option exists.

    // Create an option definition.
    OptionDefinitionPtr option_def(new OptionDefinition("foo", 700,
                                                        DHCP6_OPTION_SPACE,
                                                        "string"));

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateOptionDef6(ServerSelector::ALL(),
                                                       option_def));

    // Create an option which uses the definition.
    auto desc = createOption<OptionString>(Option::V6, 700, true, false, false, "my-option");
    OptionDescriptorPtr option((new OptionDescriptor(desc)));
    option->space_name_ = DHCP6_OPTION_SPACE;

    ASSERT_NO_THROW_LOG(cbptr_->createUpdateOption6(ServerSelector::ALL(), option));

    // Attempting to delete the definition should fail by default.
    uint64_t deleted_num = 0;
    ASSERT_THROW_MSG(deleted_num = cbptr_->deleteOptionDef6(ServerSelector::ALL(),
                                                            700, DHCP6_OPTION_SPACE),
                     InvalidOperation, "option exists for option definition: dhcp6.700");
    EXPECT_EQ(0, deleted_num);

    ASSERT_THROW_MSG(deleted_num = cbptr_->deleteOptionDef6(ServerSelector::ALL(),
                                                            700, DHCP6_OPTION_SPACE, false),
                     InvalidOperation, "option exists for option definition: dhcp6.700");
    EXPECT_EQ(0, deleted_num);

    ASSERT_NO_THROW_LOG(deleted_num = cbptr_->deleteOptionDef6(ServerSelector::ALL(),
                                                               700, DHCP6_OPTION_SPACE, true));
    EXPECT_EQ(1, deleted_num);
}
