Marked @RF but in fact seems to always fail for me:
junit.framework.AssertionFailedError: expected:<0> but was:<2>
Well, we have traded speed for accuracy, see issue #166408. So I guess this test is obsolete.
Then either delete it, or fix it to e.g. wait for EQ to be done processing outstanding events before continuing with the test.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue.
Thanks for your cooperation,
NetBeans IDE 8.2 Release Boss