[ruby-core:36539] [Ruby 1.9 - Feature #4796][Open] Coverage should be restartable

Issue #4796 has been reported by Xavier Shay.

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Feature #4796: Coverage should be restartable
http://redmine.ruby-lang.org/issues/4796

Author: Xavier Shay
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 


I would like a way to be able to make the following test past:

    require "test/unit"
    require "coverage"
    require 'tmpdir'

    class TestCoverage < Test::Unit::TestCase
      def test_restarting_coverage
        Dir.mktmpdir {|tmp|
          Dir.chdir(tmp) {
            File.open("test.rb", "w") do |f|
              f.puts <<-EOS
                def coverage_test_method
                  puts :ok
                end
              EOS
            end

            Coverage.start
            require tmp + '/test.rb'
            Coverage.result
            Coverage.start
            coverage_test_method
            assert_equal 1, Coverage.result.size
          }
        }
      end
    end

The problem is that `Coverage.start` doesn't track any files loaded before it is called. This is probably desired behaviour so that stdlib files are not tracked, but it limits the usefulness of Coverage. Specifically, I am trying to collate coverage reports from workers in multiple processes. Also I want to associate coverages with specific tests (this test executed this code, etc...). This is very difficult without being able to restart.

What would be involved in doing this? If you point me in the right direction I can perhaps have a go.



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