[ruby-core:84883] [Ruby trunk Bug#9572] Restarting Coverage does not produce correct coverage result

Issue #9572 has been updated by danmayer (Dan Mayer).


I am seeing emails from Aaron's comments.

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Bug #9572: Restarting Coverage does not produce correct coverage result
https://bugs.ruby-lang.org/issues/9572#change-69590

* Author: sean_ferguson (Sean Ferguson)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.0dev (2018-01-13 trunk 61811) [x86_64-darwin15]
* Backport: 
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Feature 4796(https://www.ruby-forum.com/topic/1811306#1001864) appears
to have a bug in it.

While the test listed there does pass the following test does not:
<pre>
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
        result = Coverage.result
        assert_equal 1, result.size
        assert_equal [0, 1, nil], result.first[1] # coverage stats show an empty array here
      }
    }
  end
end
</pre>
It appears that while the coverage is finding the correct files it is
not giving any coverage stats for those files. Knowing this information would be very helpful in determining test coverage data for individual test files. I'm not very familiar
with how the coverage library works, but if you can point me at where to
look I can give fixing it a try.

Thanks,

Sean Ferguson



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