'Verifies that strcred.makeChecker(\'anonymous\') returns an object
that implements the L{ICredentialsChecker} interface.'

def test_isChecker(self):

    checker = strcred.makeChecker('anonymous')
    self.assertTrue(checkers.ICredentialsChecker.providedBy(checker))
    self.assertIn(credentials.IAnonymous, checker.credentialInterfaces)
