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https://issues.apache.org/jira/browse/FLINK-3648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15362442#comment-15362442
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ASF GitHub Bot commented on FLINK-3648:
---------------------------------------

Github user kl0u commented on the issue:

    https://github.com/apache/flink/pull/2199
  
    Thanks for the comments @aljoscha !
    I integrated them.


> Introduce Trigger Test Harness
> ------------------------------
>
>                 Key: FLINK-3648
>                 URL: https://issues.apache.org/jira/browse/FLINK-3648
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Streaming
>            Reporter: Aljoscha Krettek
>            Assignee: Kostas Kloudas
>
> As mentioned in 
> https://docs.google.com/document/d/1Xp-YBf87vLTduYSivgqWVEMjYUmkA-hyb4muX3KRl08/edit#
>  we should build on the processing-time clock introduced in FLINK-3646 and 
> add a testing harness for triggers. The harness should allow inputting 
> elements, updating watermark, updating processing-time and firing timers. The 
> output of the trigger as well as state managed by the partitioned state 
> abstraction should be observable to verify correct trigger behavior.
> Then, we should add tests for all triggers.



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