[java] Difference between @Mock and @InjectMocks

What is the difference between @Mock and @InjectMocks in Mockito framework?

This question is related to java unit-testing mocking mockito

The answer is

@Mock creates a mock. @InjectMocks creates an instance of the class and injects the mocks that are created with the @Mock (or @Spy) annotations into this instance.

Note you must use @RunWith(MockitoJUnitRunner.class) or Mockito.initMocks(this) to initialize these mocks and inject them (JUnit 4).

With JUnit 5, you must use @ExtendWith(MockitoExtension.class).

@RunWith(MockitoJUnitRunner.class) // JUnit 4
// @ExtendWith(MockitoExtension.class) for JUnit 5
public class SomeManagerTest {

    private SomeManager someManager;

    private SomeDependency someDependency; // this will be injected into someManager
     // tests...


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