Home/

...

/

Using Annotations

Using Annotations

Learn about @Before, @After, @BeforeClass, @AfterClass in unit tests.

@Before method

Methods annotated with the @Before annotation are run before each test.

As we add more tests for a given set of related behaviors, it becomes clear that many of them have the same initialization needs. We’ll want to take advantage of the @Before method to help ensure that our tests don’t become a maintenance nightmare of redundant code.

It’s important to understand the order in which JUnit executes @Before and @Test methods.

The AssertTest class below in which the @Before method resides has two tests, hasPositiveBalance and depositIncreasesBalance.

Press + to interact
// ...
public class AssertTest {
   //...
   private Account account;
   @Before
   public void createAccount() {
      account = new Account("an account name");
   }
   @Test
   public void hasPositiveBalance() {
      //...
   }
   @Test
   public void depositIncreasesBalance() {
      //...
   }
}

Below is the flow of execution when JUnit interacts with the test class:

In other words, the @Before method executes ...

Access this course and 1400+ top-rated courses and projects.