Differentiate JUnit 4 and TestNG.

in Java, JUnit 4 and TestNG are popular unit test framework and look very similar in functionality.

TestNG supports annotation @BeforeSuite that enables running a method before even the suite runs whereas Junit 4 does not support.

TestNG supports @AfterSuite that enables running a method after the suite completes running whereas Junit 4 does not support.

Similarly TestNG adds support for test specific and groups specific before (setup )and After (teardown) annotation whereas Junit does not support.

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