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https://issues.apache.org/jira/browse/KAFKA-10200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18040754#comment-18040754
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Matthias J. Sax commented on KAFKA-10200:
-----------------------------------------
Thanks for reporting this. – I was looking into it, and seems the problem was
reintroduced with 4.0.0 release. Can you file a new ticket for this, so we can
properly track it?
> MockProcessorContext doesn't work with WindowStores
> ---------------------------------------------------
>
> Key: KAFKA-10200
> URL: https://issues.apache.org/jira/browse/KAFKA-10200
> Project: Kafka
> Issue Type: Bug
> Components: streams, streams-test-utils
> Reporter: John Roesler
> Assignee: John Roesler
> Priority: Major
> Fix For: 2.7.0
>
>
> The recommended pattern for testing custom Processor implementations is to
> use the test-utils MockProcessorContext. If a Processor implementation needs
> a store, the store also has to be initialized with the same context. However,
> the existing (in-memory and persistent) Windowed store implementations
> perform internal casts that result in class cast exceptions if you attempt to
> initialize them with the MockProcessorContext.
> A workaround is to instead embed the processor in an application and use the
> TopologyTestDriver instead.
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