def test_repair(self, connection): url = 'test-url' # test sender = Sender(url) sender.close = Mock() sender.repair() # validation sender.close.assert_called_once_with() sender.connection.close.assert_called_once_with() connection.return_value.open.assert_called_once_with() connection.return_value.channel.assert_called_once_with() self.assertEqual(sender.channel, connection.return_value.channel.return_value)