def test_singleCaseReporting(self):
        """
        If we are running a single test, check the reporter starts, passes and
        then stops the test during a dry run.
        """
        result = self.runner.run(self.test)
        self.assertEqual(result._calls, ['startTest', 'addSuccess', 'stopTest'])

        If we are running a single test, check the reporter starts, passes and
        then stops the test during a dry run.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/trial/test/test_runner.py