def test_runsWithStandardResult(self):
        """
        A L{runner.TestHolder} can run against the standard Python
        C{TestResult}.
        """
        result = pyunit.TestResult()
        self.holder.run(result)
        self.assertTrue(result.wasSuccessful())
        self.assertEqual(1, result.testsRun)

        A L{runner.TestHolder} can run against the standard Python
        C{TestResult}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/trial/test/test_runner.py