Testing Storm Bolts and Spouts

Question

This is a general question regarding Unit Testing Bolts and Spouts in a Storm Topology written in Java.

What is the recommended practice and guideline for un

Answer 1

It turns out to be fairly easy to mock storm objects like OutputDeclarer, Tuple and OutputFieldsDeclarer. Of those, only OutputDeclarer ever sees any side effects so code the OutputDeclarer mock class to be able to answer any tuples and anchors emitted, for example. Your test class can then use instances of those mock classes to easily configure a bolt/spout instance, invoke it and validate the expected side effects.