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https://issues.apache.org/jira/browse/HADOOP-4901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713630#action_12713630
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Philip Zeyliger commented on HADOOP-4901:
-----------------------------------------

Would we consider the transition world OK where we had tests in both frameworks 
for a while?  I believe the TestNG runner can run JUnit tests, so we could 
probably start adding new tests in TestNG, and transition old ones as they come 
up.

> Upgrade to JUnit 4
> ------------------
>
>                 Key: HADOOP-4901
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4901
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: test
>            Reporter: Tom White
>            Assignee: Tom White
>
> Amongst other things, JUnit 4 has better support for class-wide set up and 
> tear down (via @BeforeClass and @AfterClass annotations), and more flexible 
> assertions (http://junit.sourceforge.net/doc/ReleaseNotes4.4.html). It would 
> be nice to be able to take advantage of these features in tests we write.
> JUnit 4 can run tests written for JUnit 3.8.1 without any changes.

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