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https://issues.apache.org/jira/browse/KAFKA-6460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16736406#comment-16736406
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Guozhang Wang commented on KAFKA-6460:
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Great! Feel free to look at KIP-267 for the context of this:
https://cwiki.apache.org/confluence/display/KAFKA/KIP-267%3A+Add+Processor+Unit+Test+Support+to+Kafka+Streams+Test+Utils
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> Add mocks for state stores used in Streams unit testing
> -------------------------------------------------------
>
> Key: KAFKA-6460
> URL: https://issues.apache.org/jira/browse/KAFKA-6460
> Project: Kafka
> Issue Type: Improvement
> Components: streams, unit tests
> Reporter: Guozhang Wang
> Priority: Major
> Labels: newbie++
>
> We'd like to use mocks for different types of state stores: kv, window,
> session that can be used to record the number of expected put / get calls
> used in the DSL operator unit testing. This involves implementing the two
> interfaces {{StoreSupplier}} and {{StoreBuilder}} that can return a object
> created from, say, EasyMock, and the object can then be set up with the
> expected calls.
> In addition, we should also add a mock record collector which can be returned
> from the mock processor context so that with logging enabled store, users can
> also validate if the changes have been forwarded to the changelog as well.
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