def _assert_courses_in_block_storage(self, *course_keys):
     """
     Assert courses exist in course block storage.
     """
     for course_key in course_keys:
         self.assertTrue(
             is_course_in_block_structure_storage(course_key, self.store))
 def _assert_courses_not_in_block_storage(self, *course_keys):
     """
     Assert courses don't exist in course block storage.
     """
     for course_key in course_keys:
         assert not is_course_in_block_structure_storage(
             course_key, self.store)