def test_listAllProfilers(self):
        """
        All the profilers that can be used in L{app.AppProfiler} are listed in
        the help output.
        """
        config = twistd.ServerOptions()
        helpOutput = str(config)
        for profiler in app.AppProfiler.profilers:
            self.assertIn(profiler, helpOutput)

        All the profilers that can be used in L{app.AppProfiler} are listed in
        the help output.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_twistd.py