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# ct_cover (common_test v1.31.1)

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`Common Test` framework code coverage support module.

This module exports help functions for performing code coverage analysis.

## Summary

### Functions

add_nodes(Nodes)

Adds nodes to current cover test. Notice that this only works if cover support is active.

cross_cover_analyse(Level, Tests)

Accumulates cover results over multiple tests. See section Cross Cover Analysis in the User's Guide.

remove_nodes(Nodes)

Removes nodes from the current cover test.

## Functions

# add_nodes(Nodes)

    -spec add_nodes(Nodes) -> {ok, StartedNodes} | {error, Reason}
                       when
                           Nodes :: node() | [node()],
                           StartedNodes :: [node()],
                           Reason :: cover_not_running | term().

Adds nodes to current cover test. Notice that this only works if cover support is active.

To have effect, this function is to be called from `init_per_suite/1` (see `ct_suite`) before any tests are performed.

# cross_cover_analyse(Level, Tests)

(since OTP R16B)

    -spec cross_cover_analyse(Level, Tests) -> ok
                                 when
                                     Level :: overview | details,
                                     Tests :: [{Tag :: atom(), Dir :: file:name_all()}].

Accumulates cover results over multiple tests. See section Cross Cover Analysis in the User's Guide.

# remove_nodes(Nodes)

    -spec remove_nodes(Nodes) -> ok | {error, Reason}
                          when
                              Nodes :: node() | [node()],
                              Reason :: cover_not_running | not_main_node | term().

Removes nodes from the current cover test.

Call this function to stop cover test on nodes previously added with `ct_cover:add_nodes/1`. Results on the remote node are transferred to the `Common Test` node.