Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/4229#issuecomment-118898618
@prabeesh
To write a Python unit test, could you take a look at `KafkaStreamTests`
and `FlumeStreamTests` in
https://github.com/apache/spark/blob/master/python/pyspark/streaming/tests.py?
Generally, you need to add something like
[FlumeTestUtils](https://github.com/apache/spark/blob/master/external/flume/src/main/scala/org/apache/spark/streaming/flume/FlumeTestUtils.scala)
or
[KafkaTestUtils](https://github.com/apache/spark/blob/master/external/kafka/src/main/scala/org/apache/spark/streaming/kafka/KafkaTestUtils.scala)
to add a method to setup a MQTT server in Scala. Then in the Python unit test,
you can call this Scala method via py4j, and then use the Python MQTT api to
setup a stream, and verify it. You can reuse many codes in
[MQTTStreamSuite](https://github.com/apache/spark/blob/master/external/mqtt/src/test/scala/org/apache/spark/streaming/mqtt/MQTTStreamSuite.scala).
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