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Calling callbacks with Mockito

You want to set up an Answer object that does that. Have a look at the Mockito documentation, at https://static.javadoc.io/org.mockito/mockito-core/2.8.47/org/mockito/Mockito.html#answer_stubs You might write something like when(mockService.doAction(any(Request.class), any(Callback.class))).thenAnswer( new Answer<Object>() { Object answer(InvocationOnMock invocation) { ((Callback<Response>) invocation.getArguments()[1]).reply(x); return null; } }); (replacing x with whatever it ought to be, of course)

Mockito: Inject real objects into private @Autowired fields

Use @Spy annotation @RunWith(MockitoJUnitRunner.class) public class DemoTest { @Spy private SomeService service = new RealServiceImpl(); @InjectMocks private Demo demo; /* … */ } Mockito will consider all fields having @Mock or @Spy annotation as potential candidates to be injected into the instance annotated with @InjectMocks annotation. In the above case ‘RealServiceImpl’ instance will get injected … Read more

throw checked Exceptions from mocks with Mockito

Check the Java API for List. The get(int index) method is declared to throw only the IndexOutOfBoundException which extends RuntimeException. You are trying to tell Mockito to throw an exception SomeException() that is not valid to be thrown by that particular method call. To clarify further. The List interface does not provide for a checked … Read more

Why is my class not calling my mocked methods in unit test?

Problem Overview (Classes vs Instances) Mocks are instances (that’s why they are also called “mock objects”). Calling Mockito.mock on a class will return a mock object for this class. It must be assigned to a variable which can then be passed to the relevant methods or injected as dependency into other classes. It does not … Read more

junit testing for user input using Scanner

You can change the System.in stream using System.setIn() method. Try this, @Test public void shouldTakeUserInput() { InputOutput inputOutput= new InputOutput(); String input = “add 5”; InputStream in = new ByteArrayInputStream(input.getBytes()); System.setIn(in); assertEquals(“add 5”, inputOutput.getInput()); } You have just modified the System.in field. System.in is basically an InputStream which reads from the console (hence your input … Read more

PowerMock, mock a static method, THEN call real methods on all other statics

What are you looking for is called partial mocking. In PowerMock you can use mockStaticPartial method. In PowerMockito you can use stubbing, which will stub only the method defined and leave other unchanged: PowerMockito.stub(PowerMockito.method(StaticUtilClass.class, “someStaticMethod”)).toReturn(5); also don’t forget about the @PrepareForTest(StaticUtilClass.class)

Mock final class with Mockito 2

Weird that your solution seems to work. According to their documentation on Github it says. Mocking of final classes and methods is an incubating, opt-in feature. It uses a combination of Java agent instrumentation and subclassing in order to enable mockability of these types. As this works differently to our current mechanism and this one … Read more

Mocking Logger and LoggerFactory with PowerMock and Mockito

EDIT 2020-09-21: Since 3.4.0, Mockito supports mocking static methods, API is still incubating and is likely to change, in particular around stubbing and verification. It requires the mockito-inline artifact. And you don’t need to prepare the test or use any specific runner. All you need to do is : @Test public void name() { try … Read more

Using Mockito to mock classes with generic parameters

I think you do need to cast it, but it shouldn’t be too bad: Foo<Bar> mockFoo = (Foo<Bar>) mock(Foo.class); when(mockFoo.getValue()).thenReturn(new Bar());

Mockito.any() pass Interface with Generics

There is a type-safe way: use ArgumentMatchers.any() and qualify it with the type: ArgumentMatchers.<AsyncCallback<ResponseX>>any()