def test_get_prerequisite_milestone_returns_milestone(self):
        """ Test test_get_prerequisite_milestone_returns_milestone """

        gating_api.add_prerequisite(self.course.id, self.seq1.location)
        prereq = gating_api._get_prerequisite_milestone(self.seq1.location)  # pylint: disable=protected-access
        self.assertIsNotNone(prereq)
    def test_get_prerequisite_milestone_returns_none(self, mock_log):
        """ Test test_get_prerequisite_milestone_returns_none """

        prereq = gating_api._get_prerequisite_milestone(self.seq1.location)  # pylint: disable=protected-access
        self.assertIsNone(prereq)
        self.assertTrue(mock_log.called)