Upgrade to JUnit 4
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                 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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