What is the difference between Mockito.mock(SomeClass) and the @Mock annotation?

java unit-testing junit mocking mockito
Gábor Csikós picture Gábor Csikós · May 9, 2014 · Viewed 22.8k times · Source

What is the difference between Mockito.mock(Class<T> classToMock) method and the @Mock annotation? Are they the same?

For Example, is this: 

private TestClass test = Mockito.mock(TestClass.class);

the same as:

@Mock
private TestClass test;

Answer

Mureinik picture Mureinik · May 9, 2014

They both achieve the same result. Using an annotation (@Mock) is usually considered "cleaner", as you don't fill up your code with boilerplate assignments that all look the same.

Note that in order to use the @Mock annotation, your test class should be annotated with @RunWith(MockitoJUnitRunner.class) or contain a call to MockitoAnnotations.initMocks(this) in its @Before method.

Related questions

How to tell a Mockito mock object to return something different the next time it is called?

So, I'm creating a mock object as a static variable on the class level like so... In one test, I want Foo.someMethod() to return a certain value, while in another test, I want it to return a different value. …

Read More
mock instance is null after @Mock annotation

I try to run this test: @Mock IRoutingObjHttpClient routingClientMock; @Mock IRoutingResponseRepository routingResponseRepositoryMock; @Test public void testSendRoutingRequest() throws Exception { CompleteRoutingResponse completeRoutingResponse = new CompleteRoutingResponse(); completeRoutingResponse.regression_latencyMillis = 500L; Mockito.when(routingClientMock.sendRoutingRequest(any(RoutingRequest.class))).thenReturn(completeRoutingResponse); RoutingObjHttpClientWithReRun routingObjHttpClientWithReRun = new RoutingObjHttpClientWithReRun (routingClientMock, …

Read More
Mock private method in the same class that is being tested

I have a Java class named, MyClass, that I want to test with JUnit. The public method, methodA, that I want to test calls a private method, methodB, in the same class to determine which conditional path to follow. My …

Read More