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https://issues.apache.org/jira/browse/KAFKA-4927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15960721#comment-15960721
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Wim Van Leuven commented on KAFKA-4927:
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What needs to happen to get this PR merged?
> KStreamsTestDriver fails with NPE when KStream.to() sinks are used
> ------------------------------------------------------------------
>
> Key: KAFKA-4927
> URL: https://issues.apache.org/jira/browse/KAFKA-4927
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.2.0
> Reporter: Wim Van Leuven
> Labels: test
>
> *Context*
> KStreamsTestDriver allows to build integration tests of KStreamsTopologies.
> This also includes topologies that sink data into outgoing topics by calling
> the KStream.to() methods.
> *Problem*
> When a topic is added as a sink, the KStreamsTestDriver fails with
> NullPointerExceptions.
> *Solution*
> BugFix the method KStreamTestDriver.process() method to also lookup a topic
> by topicName as a sink when a source has not been found.
> *PullRequest*
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