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https://issues.apache.org/jira/browse/KAFKA-12521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17306698#comment-17306698
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A. Sophie Blee-Goldman commented on KAFKA-12521:
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I'll try to poke around the make subtasks for the integration tests that could
be improved, if anyone wants to help out or knows or has some tests already in
mind, please go ahead and file a subtask for it
> Expand coverage of integration tests with more realistic applications
> ---------------------------------------------------------------------
>
> Key: KAFKA-12521
> URL: https://issues.apache.org/jira/browse/KAFKA-12521
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: A. Sophie Blee-Goldman
> Priority: Major
> Labels: integration-tests
>
> Many of the integration tests in Kafka Streams run a minimal topology, often
> just consuming a single input topic without doing any processing or producing
> to an output topic. Some of the complex concurrency bugs that we've found
> only showed up when we had some actual data to process and a stateful
> topology: [KAFKA-12503|https://issues.apache.org/jira/browse/KAFKA-12503] and
> [KAFKA-12500|https://issues.apache.org/jira/browse/KAFKA-12500]
> We should try to expand the Streams applications in these test to really flex
> the tested feature or general stability of streams. These tests should
> # Produce some data to the input topic so Streams will actually have
> something to consume
> # Include one or more stateful operators in the topology, with caching enabled
> # Insert a repartition, or force one with a key-changing operation, to get
> multiple subtopologies
> # Write out some results to an output topic
> # Verify the results in the output topic
> We don't necessarily need to do all of these at the same time, any
> incremental improvement would help. Perhaps we could even write a standard
> framework for integration tests that includes all of the above, so we need
> only plug our test into the framework when designing new integration tests.
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