def test_start(self):
        """
        The C{start} command changes the current path.
        """
        curdir = os.path.realpath(os.path.curdir)
        self.addCleanup(os.chdir, curdir)
        self.server.start('..')
        self.assertNotEqual(os.path.realpath(os.path.curdir), curdir)

        The C{start} command changes the current path.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/trial/_dist/test/test_worker.py