'The view should return HTTP 404 when retrieving data for a course that does not exist.'

def test_retrieve_invalid_course(self):

    path = reverse('commerce_api:v1:courses:retrieve_update', args=['a/b/c'])
    response = self.client.get(path, content_type=JSON_CONTENT_TYPE)
    self.assertEqual(response.status_code, 404)
