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https://issues.apache.org/jira/browse/HADOOP-6891?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12893916#action_12893916
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Konstantin Boudnik commented on HADOOP-6891:
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bq. This would be a good step toward clarifying the difference between unit and 
integration tests, which is a bit muddled at the moment in the source tree.

Right on! Because examples aren't unit tests in any sense of this word. They 
might be functional tests at best. As for integration tests: I'd agree that 
having something around mini-clusters might pass as integration. However, I 
tend to suggest that actual integration validation needs to be done in a real 
cluster environment.


> write Junit test cases that run the Hadoop examples
> ---------------------------------------------------
>
>                 Key: HADOOP-6891
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6891
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: test
>    Affects Versions: 0.20.2
>         Environment: N/A
>            Reporter: Saikat Kanjilal
>            Priority: Minor
>             Fix For: 0.20.3
>
>   Original Estimate: 20h
>  Remaining Estimate: 20h
>
> I will be adding junit test cases that run the hadoop examples, specifically 
> I'll be adding a test suite that tests everything under the 
> src/examples/org/apache/hadoop/examples package.  Since this is my first 
> contribution to the project I'll need some help to figure out how to submit 
> this

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