def test_noVariable(self):
        """
        L{_setupPath} doesn't change C{sys.path} if B{TRIAL_PYTHONPATH} is not
        present in the environment.
        """
        originalPath = sys.path[:]
        _setupPath({})
        self.assertEqual(originalPath, sys.path)

        L{_setupPath} doesn't change C{sys.path} if B{TRIAL_PYTHONPATH} is not
        present in the environment.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/trial/_dist/test/test_workertrial.py