def test_interface(self):
        self.assertTrue(
            IUsernameHashedPassword.implementedBy(CramMD5Credentials))
L{CramMD5Credentials} implements the L{IUsernameHashedPassword}
dataset/ETHPy150Open twisted/twisted/twisted/cred/test/test_cramauth.py/CramMD5CredentialsTests.test_interface