Incompatibility with CI::Reporter

[toddmazierski]

minitest-display appears to be incompatible with CI::Reporter. After the tests are finished, the following exception occurs:

/opt/src/foo/my-app/vendor/bundle/ruby/1.9.1/gems/minitest-display-0.0.3/lib/minitest/display.rb:221:in `status': You have a nil object when you didn't expect it! (NoMethodError)
You might have expected an instance of Array.
The error occurred while evaluating nil.sort!
  from /opt/src/foo/my-app/vendor/bundle/ruby/1.9.1/gems/ci_reporter-1.7.2/lib/ci/reporter/minitest.rb:158:in `finished_anything'
  from /opt/src/foo/my-app/vendor/bundle/ruby/1.9.1/gems/ci_reporter-1.7.2/lib/ci/reporter/minitest.rb:79:in `_run_anything'
  from /opt/src/foo/my-app/vendor/bundle/ruby/1.9.1/gems/minitest-2.7.0/lib/minitest/unit.rb:934:in `run_tests'
  from /opt/src/foo/my-app/vendor/bundle/ruby/1.9.1/gems/minitest-2.7.0/lib/minitest/unit.rb:921:in `block in _run'
  from /opt/src/foo/my-app/vendor/bundle/ruby/1.9.1/gems/minitest-2.7.0/lib/minitest/unit.rb:920:in `each'
  from /opt/src/foo/my-app/vendor/bundle/ruby/1.9.1/gems/minitest-2.7.0/lib/minitest/unit.rb:920:in `_run'
  from /opt/src/foo/my-app/vendor/bundle/ruby/1.9.1/gems/minitest-2.7.0/lib/minitest/unit.rb:909:in `run'
  from /usr/lib64/ruby/1.9.1/test/unit.rb:21:in `run'
  from /usr/lib64/ruby/1.9.1/test/unit.rb:326:in `block (2 levels) in autorun'
  from /usr/lib64/ruby/1.9.1/test/unit.rb:27:in `run_once'
  from /usr/lib64/ruby/1.9.1/test/unit.rb:325:in `block in autorun'

[toddmazierski]

I did a little investigation, and think I see the cause of the problem:

minitest-display appears to patch MiniTest::Unit._run_anything and MiniTest::Unit._run_suite, but CI::Reporter assigns itself as the default MiniTest runner using the MiniTest::Unit.runner= method, with its own _run_anything and _run_suite methods.

As a result, variables like @test_times aren't being set, causing the exception noted above.

Hope you find this helpful! Please let me know if you have any questions or suggestions.