def test_remove_users(self):
chat = Chat()
chat.add_users([self.bob, self.clair, self.morgana])
self.assertEqual(chat.users.count(), 3)
self.assertIn(self.bob, chat.users.all())
chat.remove_users([self.bob])
self.assertEqual(chat.users.count(), 2)
self.assertNotIn(self.bob, chat.users.all())
chat.remove_users([self.morgana, self.clair])
self.assertEqual(chat.users.count(), 0)
