def test_wasSuccessfulTrueAfterSuccesses(self):
        self.result.addSuccess(self.test)
        self.assertEqual(True, self.result.wasSuccessful())
wasSuccessful() is True when there have been only successes, False
dataset/ETHPy150Open twisted/twisted/twisted/trial/test/test_reporter.py/ReporterInterfaceTests.test_wasSuccessfulTrueAfterSuccesses