Failing test - in Ruby19 workers die when trying to output accented chars

This pull-request provides an example of test which tries to output accented characters (łżęąść...). Those tests are passing when running in single thread mode (without using parallel_tests), however when we run them through parallel_tests they make parallel workers to die without reporting anything.

This only fails in Ruby19 (1.9.3-p385). It passes on Ruby18 or Ruby20.

I think this might be related to: https://github.com/grosser/parallel_tests/issues/181, as I'm having same ```Broken pipe (Errno::EPIPE)``` error for cucumber tests (rspec workers just die without providing output).