Junit Annotations

Here’re some basic JUnit annotations you should understand:

1. @BeforeClass – Run once before any of the test methods in the class, public static void
2. @AfterClass – Run once after all the tests in the class have been run, public static void
3. @Before – Run before @Test, public void
4. @After – Run after @Test, public void
5. @Test – This is the test method to run, public void

import org.junit.*;

public class BasicAnnotationTest {

    // Run once, e.g. Database connection, connection pool

    @BeforeClass

    public static void runOnceBeforeClass() {

        System.out.println("@BeforeClass - runOnceBeforeClass");

    }

    // Run once, e.g close connection, cleanup

    @AfterClass

    public static void runOnceAfterClass() {

        System.out.println("@AfterClass - runOnceAfterClass");

    }

    // Should rename to @BeforeTestMethod

    // e.g. Creating an similar object and share for all @Test

    @Before

    public void runBeforeTestMethod() {

        System.out.println("@Before - runBeforeTestMethod");

    }

    // Should rename to @AfterTestMethod

    @After

    public void runAfterTestMethod() {

        System.out.println("@After - runAfterTestMethod");

    }

    @Test

    public void test_method_1() {

        System.out.println("@Test - test_method_1");

    }

    @Test

    public void test_method_2() {

        System.out.println("@Test - test_method_2");

    }

}

@BeforeClass - runOnceBeforeClass

@Before - runBeforeTestMethod

@Test - test_method_1

@After - runAfterTestMethod

@Before - runBeforeTestMethod

@Test - test_method_2

@After - runAfterTestMethod

@AfterClass - runOnceAfterClass