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https://issues.apache.org/jira/browse/NIFI-5318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16535712#comment-16535712
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ASF GitHub Bot commented on NIFI-5318:
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Github user peter-gergely-horvath commented on the issue:
https://github.com/apache/nifi/pull/2843
@joewitt The idea is that this component would allow you to write Java test
cases against your NiFi flow. Something like
[NiFiFlowTest](https://github.com/peter-gergely-horvath/nifi/blob/master/nifi-testharness/src/test/java/org/apache/nifi/testharness/samples/NiFiFlowTest.java#L101).
The JavaDoc on
[TestNiFiInstance](https://github.com/peter-gergely-horvath/nifi/blob/master/nifi-testharness/src/main/java/org/apache/nifi/testharness/TestNiFiInstance.java#L45)
should explain the concept quite well.
> Implement NiFi test harness
> ---------------------------
>
> Key: NIFI-5318
> URL: https://issues.apache.org/jira/browse/NIFI-5318
> Project: Apache NiFi
> Issue Type: New Feature
> Reporter: Peter Horvath
> Priority: Major
>
> Currently, it is not really possible to automatically test the behaviour of a
> specific NiFi flow and make unit test type asserts if it works as expected.
> For example, if the expected behaviour of a NiFi flow is that a file placed
> to a specific directory will trigger some operation after which some output
> file will appear at another directory, once currently can only do one thing:
> test the NiFi flow manually.
> Manual testing is especially hard to manage if a NiFi flow is being actively
> developed: any change to a complex, existing NiFi flow might require a lot of
> manual testing just to ensure there are no regressions introduced.
> Some kind of Java API that allows managing a NiFi instance and manipulating
> flow deployments like for example, [Codehaus
> Cargo|]https://codehaus-cargo.github.io/] would be of great help.
>
>
>
>
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