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https://issues.apache.org/jira/browse/KAFKA-10200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17211347#comment-17211347
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Sophie Blee-Goldman commented on KAFKA-10200:
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[~vvcephei] can we resolve this ticket or was there some followup
work/improvement that isn't yet merged?
> 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
>
> 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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