'Test to get the course structure'

def test_get_structure_non_existing_key(self):

    self.assertEqual(utils.get_course_chapters(None), None)
    fake_course_key = CourseKey.from_string('course-v1:FakeOrg+CN1+CR-FALLNEVER1')
    self.assertEqual(utils.get_course_chapters(fake_course_key), None)
