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If your tests are parametrized and some of them are failing, then test results window works OK only when you execute test file directly. If you start execution by "Test" menu on the project then nothing shown. Steps: 1. Get the project from http://netbeans.org/bugzilla/show_bug.cgi?id=186274 2. Invoke Test on the project node Output window disappears at the end of tests execution.
It's happened to be more generic. Seems that in 6.9 output tab is shown in case of _any_ failures. *** This bug has been marked as a duplicate of bug 186277 ***