Use this annotation on your class under test and Mockito will try to inject mocks either by constructor injection, setter injection, or property injection. Here we've added one mock method calls, add () to the mock object via when (). Conclusion. This magic succeeds, it fails silently or a MockitoException is thrown. 1. IMHO you need to add a @RunWith (some.mockito.TestSuiteIDontRememberName.class) annotated to the test class. The main issue here is whenever I try to run the test syncLocalOrders_OrderNotEmptySuccessTest (), the code enters to both subscribe and throwable of fun syncLocalOrders (syncOrders: SyncOrders) (this was got by keeping breakpoints.) MockitoAnnotations.initMocks (this); initializes fields annotated with Mockito annotations. Teams. Mockito Annotations In Mockito, the mocks are injected either by setter injection, … Just like for @Mock annotation you can use the built-in runner: MockitoJUnitRunner or rule: MockitoRule. However, it may be helpful when it comes to debugging, as we use the mock's name to track down verification errors. Mockito Exception as an Object. There are two solutions: The @Mock annotation is alternative to Mockito.mock(classToMock). Mockito Annotations Note that mockito-junit-jupiter is required for JUnit 5, if you are using any other testing framework such as JUnit 4 or TestNG then you remove this dependency and include only mockito-core dependency. I’m using Mockito to test the following method: protected void produceProducedFieldValue (Target target) throws ValueProducerCreationException { String mappedValue = (String) valueProducerFactory.createValueProducer ("IdProducer", Collections.emptyList ()).get (); target … Null pointer exception when using Mockito to mock interface. However I'm trying to mock a net.sf.ehcacheCache object. Mockito Here I am trying to mock the rest template and wanted to return an HTTP Status of 200, but still, it returns a null value. Mockito mock objects returns null In this line: Mockito.when (valueProducerFactory.createValueProducer ("IdProducer", Collections.emptyList ()).get ()).thenReturn (mappedValue); you are calling get () on the result of the createValueProducer () call, which is null because you haven't mocked it yet. In JUnit 4, the annotation @RunWith can only be used once. Using @MockitoJUnitRunner means you cannot use other runners anymore. NullPointerException Mockito @Mock Annotation. In this case, we must remember to make our rule public. mockito Just like for @Mock annotation you can use the built-in runner: MockitoJUnitRunner or rule: MockitoRule. Don’t forget to annotate your Testing class with @RunWith(MockitoJUnitRunner.class). If I were you, I'd first try to initialize the mocked instances in a @Before …