JUnit Interview Question: Annotations used in JUnit and their purposes

JUnit is a popular testing framework for Java applications and provides various annotations to facilitate testing. Here are some of the annotations used in JUnit and their purposes:

1. @Test: This annotation indicates that the method is a test method that JUnit should run.
2. @Before: This annotation indicates that the method should be executed before each test method to set up the test environment.
3. @After: This annotation indicates that the method should be executed after each test method to tear down the test environment.
4. @BeforeClass: This annotation indicates that the method should be executed before any test method in the class is run, typically used for setup tasks that are performed once.
5. @AfterClass: This annotation indicates that the method should be executed after all test methods in the class have been run, typically used for cleanup tasks.
6. @Ignore: This annotation indicates that the test method should be ignored by the test runner.
7. @RunWith: This annotation specifies a custom test runner to be used for running the tests.

By utilizing these annotations effectively, testers can organize and control the execution of their JUnit tests with precision.