Mockito: Mock private field initialization

by

Mockito comes with a helper class to save you some reflection boiler plate code:

import org.mockito.internal.util.reflection.Whitebox;

//...

@Mock
private Person mockedPerson;
private Test underTest;

// ...

@Test
public void testMethod() {
    Whitebox.setInternalState(underTest, "person", mockedPerson);
    // ...
}

Update:
Unfortunately the mockito team decided to remove the class in Mockito 2. So you are back to writing your own reflection boilerplate code, use another library (e.g. Apache Commons Lang), or simply pilfer the Whitebox class (it is MIT licensed).

Update 2:
JUnit 5 comes with its own ReflectionSupport and AnnotationSupport classes that might be useful and save you from pulling in yet another library.

More Related Contents:

  1. @RunWith(MockitoJUnitRunner.class) vs MockitoAnnotations.initMocks(this)
  2. Mocking static methods with Mockito
  3. How do you assert that a certain exception is thrown in JUnit 4 tests?
  4. How to mock a final class with mockito
  5. How to mock private method for testing using PowerMock?
  6. How to run test methods in specific order in JUnit4?
  7. Difference between @Mock, @MockBean and Mockito.mock()
  8. Mockito: Trying to spy on method is calling the original method
  9. How to test that no exception is thrown?
  10. Mockito: InvalidUseOfMatchersException
  11. Is it possible to use Mockito in Kotlin?
  12. How to use ArgumentCaptor for stubbing?
  13. Is it discouraged to use @Spy and @InjectMocks on the same field?
  14. Unfinished Stubbing Detected in Mockito
  15. Mockito, JUnit and Spring
  16. What is the difference between mocking and spying when using Mockito?
  17. How do I assert an Iterable contains elements with a certain property?
  18. Mockito – NullpointerException when stubbing Method
  19. Using Mockito to mock classes with generic parameters
  20. Mocking Logger and LoggerFactory with PowerMock and Mockito
  21. junit testing for user input using Scanner
  22. Mockito: Inject real objects into private @Autowired fields
  23. How to define a JUnit method rule in a test suite?
  24. Cleanup after all junit tests
  25. How to mock RestTemplate in Java Spring?
  26. Mockito, @InjectMocks strange behaviour with final fields
  27. JUnit 4 @BeforeClass & @AfterClass when using Suites
  28. Specifying order of execution in JUnit test case [duplicate]
  29. Can Mockito verify parameters based on their values at the time of method call?
  30. Can’t run JUnit 4 test case in Eclipse Android project

Leave a Comment