def test_fail_handle(self):
        """
        Test the handle method with unsuccessful requests.

        @raise AssertionError: If the test fails.
        """
        handler = self.chain_link_one_class()
        with self.assertRaises(AttributeError):
            handler.handle("foo")

        Test the handle method with unsuccessful requests.

        @raise AssertionError: If the test fails.
        
tests/behavioral_tests/test_chain.py