Package org.mockito

Class MockitoAnnotations

java.lang.Object
org.mockito.MockitoAnnotations
public final class MockitoAnnotations extends Object
MockitoAnnotations.openMocks(this); initializes fields annotated with Mockito annotations. See also MockitoSession which not only initializes mocks but also adds extra validation for cleaner tests!

  • Allows shorthand creation of objects required for testing.
  • Minimizes repetitive mock creation code.
  • Makes the test class more readable.
  • Makes the verification error easier to read because field name is used to identify the mock.

   public class ArticleManagerTest extends SampleBaseTestCase {

       @Mock private ArticleCalculator calculator;
       @Mock private ArticleDatabase database;
       @Mock private UserProvider userProvider;

       private ArticleManager manager;

       @Before public void setup() {
           manager = new ArticleManager(userProvider, database, calculator);
       }
   }

   public class SampleBaseTestCase {

       private AutoCloseable closeable;

       @Before public void openMocks() {
           closeable = MockitoAnnotations.openMocks(this);
       }

       @After public void releaseMocks() throws Exception {
           closeable.close();
       }
   }

Read also about other annotations @Spy, @Captor, @InjectMocks

MockitoAnnotations.openMocks(this) method has to be called to initialize annotated fields.

In above example, openMocks() is called in @Before (JUnit4) method of test's base class. You can also put openMocks() in your JUnit runner (@RunWith) or use built-in runner: MockitoJUnitRunner. If static method mocks are used, it is required to close the initialization. Additionally, if using third-party mock-makers, other life-cycles might be handled by the open-release routine.

  • Method Details

    • openMocks

      public static AutoCloseable openMocks(Object testClass)
      Initializes objects annotated with Mockito annotations for given testClass: @Mock, @Spy, @Captor, @InjectMocks

      See examples in javadoc for MockitoAnnotations class.

      Returns:
      A closable to close when completing any tests in testClass.

    • initMocks

      @Deprecated public static void initMocks(Object testClass)
      Deprecated.
      Use openMocks(Object) instead. This method is equivalent to openMocks(testClass).close(). The close method should however only be called after completed usage of testClass. If using static-mocks or custom MockMakers, using this method might cause misbehavior of mocks injected into the test class.
      Initializes objects annotated with Mockito annotations for given testClass: @Mock, @Spy, @Captor, @InjectMocks

      See examples in javadoc for MockitoAnnotations class.