require_relative '../../../spec_helper'
require 'stringio'
require 'zlib'

describe "Zlib::GzipReader#getc" do
  before :each do
    @data = '12345abcde'
    @zip = [31, 139, 8, 0, 44, 220, 209, 71, 0, 3, 51, 52, 50, 54, 49, 77,
            76, 74, 78, 73, 5, 0, 157, 5, 0, 36, 10, 0, 0, 0].pack('C*')
    @io = StringIO.new @zip
  end

  it "returns the next character from the stream" do
    gz = Zlib::GzipReader.new @io
    gz.pos.should == 0

    gz.getc.should == '1'
    gz.getc.should == '2'
    gz.getc.should == '3'
    gz.getc.should == '4'
    gz.getc.should == '5'
  end

  it "increments position" do
    gz = Zlib::GzipReader.new @io
    (0..@data.size).each do |i|
      gz.pos.should == i
      gz.getc
    end
  end

  it "returns nil at the end of the stream" do
    gz = Zlib::GzipReader.new @io
    gz.read
    pos = gz.pos
    gz.getc.should be_nil
    gz.pos.should == pos
  end
end
