'User sees a warning when \'Go\' is pressed and no action is selected.'

def test_user_message_on_no_action(self):

    action_data = {ACTION_CHECKBOX_NAME: [self.s1.pk, self.s2.pk], 'action': '', 'index': 0}
    url = reverse('admin:admin_views_subscriber_changelist')
    response = self.client.post(url, action_data)
    self.assertRedirects(response, url, fetch_redirect_response=False)
    response = self.client.get(response.url)
    self.assertContains(response, 'No    action    selected.')
    self.assertEqual(Subscriber.objects.count(), 2)
