JUnit has some basic and important annotations, such as the following:

• The @BeforeClass: This runs once before any test functions in the class. In this function, you can connect the database or connection pool. This function has to be a static method.
• The @AfterClass: This runs once after any test functions in the class. In this function, you can close the database connection and cleanup.
• The @Before: This can run before @Test annotated functions. Here you create some objects and share to all @Test annotated testing functions.
• The @After: This can run after @Test annotated functions. Here, you modify or clean the objects and share to all @Test annotated testing functions.
• The @Test: This annotated function is the test function.

Now we'll look at an example of how to test a project with JUnit. Here, you can learn about the life cycle of the testing annotations and the use of these annotations.