def setUp(self):
        """
        Create a testable, deterministic clock and a C{TimeoutTester} instance.
        """
        self.clock = task.Clock()
        self.proto = TimeoutTester(self.clock)

        Create a testable, deterministic clock and a C{TimeoutTester} instance.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_policies.py