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When the Selenium Server is not started, in NetBeans "Test Results" window (which is the one that's comming up when you start the tests), 100% are green. I have to manually open the "Output" window to see that all acceptance tests gave an *error*. On the other hand, if Codeception throws a [RuntimeException] it is communicated correctly to NetBeans (resulting in the test file being marked as "Failed" in 'Test Results'). So I'm suggeting to report [ConnectionException]s the same way as [RuntimeException]s.