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.

This might be related to: https://github.com/grosser/parallel_tests/issues/181 -- ```Broken pipe (Errno::EPIPE)```