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https://issues.apache.org/jira/browse/KAFKA-15242?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17846632#comment-17846632
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Matej Sprysl commented on KAFKA-15242:
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I would also like this fixed. Currently, the API provides no other way to test
FixedKeyProcessors other than creating a full test driver topology.
> FixedKeyProcessor testing is unusable
> -------------------------------------
>
> Key: KAFKA-15242
> URL: https://issues.apache.org/jira/browse/KAFKA-15242
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Reporter: Zlstibor Veljkovic
> Assignee: Alexander Aghili
> Priority: Major
>
> Using mock processor context to get the forwarded message doesn't work.
> Also there is not a well documented way for testing FixedKeyProcessors.
> Please see the repo at [https://github.com/zveljkovic/kafka-repro]
> but most important piece is test file with runtime and compile time errors:
> [https://github.com/zveljkovic/kafka-repro/blob/master/src/test/java/com/example/demo/MyFixedKeyProcessorTest.java]
>
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