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https://issues.apache.org/jira/browse/HADOOP-4605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645839#action_12645839
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Doug Cutting commented on HADOOP-4605:
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> unit tests may call package private methods [ ... ]

Good point.  For this to be effective we would probably need to segregate tests 
into tests that use only public APIs and tests that do not.

> should run old version of unit tests to check back-compatibility
> ----------------------------------------------------------------
>
>                 Key: HADOOP-4605
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4605
>             Project: Hadoop Core
>          Issue Type: Improvement
>            Reporter: Doug Cutting
>
> We should test back-compatibility by running unit tests from a prior release.

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