If run PHPUnit test using run-tests.sh then the info is not correctly retrieved from the class... for example:
$ php ./core/scripts/run-tests.sh --class "Drupal\breakpoint\Tests\BreakpointMediaQueryTest"
Drupal test run
---------------
Tests to be run:
- (Drupal\breakpoint\Tests\BreakpointMediaQueryTest)
Test run started:
Thursday, May 9, 2013 - 16:31
Test summary
------------
Breakpoint media query tests 2 passes, 0 fails, and 0 exceptions
Test run duration: 0 sec