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https://issues.apache.org/jira/browse/NIFI-5318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16657991#comment-16657991
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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/2872
  
    Hi @MikeThomsen sorry for the delay, I have been just very busy. It turns 
out there have been some changes in the flow XML format, which I have fixed 
against the latest GA version: now all of the tests are executed properly. 
    
    I have also introduced strict version checking: the NiFi version referenced 
in the flow file is checked against the actual version of the NiFi distribution 
used so that we can avoid confusion in the future.
    
    If a user tries to run the test harness with a flow created using a 
different version of NiFi than the one actually used, this will fail fast, 
preventing a non functioning installation leaving the user being confused why 
it does not work properly.
     


> 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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