def test_publish(MockMqttClient):
client = Client('host')
def on_connect(*args, **kwargs):
client._connected = True
MockMqttClient.return_value.connect.side_effect = on_connect
client.connect()
client.publish('msg', 'topic')
MockMqttClient.return_value.publish.assert_called_once_with('msg', 'topic')
