how to verify a method of a non-mock object is called?

Question

It seems mockito only verifies whether a method of a mock object is called and the mock object always have something like doReturn().when(mock object)

But can I create a mock object and define doReturn().when(mock object) and then verify a method of another object is called?

Here is what I want to do: I define a mockEnvironment and return a response no matter what happens. But then I want to verify different methods of anotherObj is called in different cases.

How to do that?

public class BaseClass { private Environment mockEnvironment; @Test public void testcase () { setMockitoEnvironment(); response = foo(mockEnvironment, argument1); verify(anotherObj).codePath1(...); response = foo(mockEnvironment, argument2); verify(anotherObj).codePath2(...); } } //this method successfully return a response with any input //because I do not care how response is eventually generated, //I only care whether code path reaches createResponse() via //code path 1 or code path 2. private void setMockitoEnvironment() { mockEnvironment = mock(Environment.class); doReturn (response).when(mockEnvironment).createResponse(for any input); } private Response foo(...) { ... return createResponse(...); }

geco17 · Accepted Answer · 2019-10-14 14:06:02Z

195

You can use a Mockito Spy for this. If you setup anotherObj as a spy you can verify method calls on that object. In your example you need to make sure that the call to foo uses the spy instead of an ordinary implementation of anotherObj. The spy is setup something like this:

AnotherClass anotherObjSpy = Mockito.spy(new AnotherClass()); // do stuff -- e.g. anotherObjSpy.foo(...); verify(anotherObjSpy).codePath1(...);

edited Oct 14, 2019 at 14:06

geco17

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answered Jun 25, 2015 at 7:45

K Erlandsson

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5 Comments

user389955 Over a year ago

That means I may need to create and inject multiple mocked objects if I want to verify multiple things? that is not convenient.

K Erlandsson Over a year ago

@user389955 yes, you need to setup each object you want to check as a spy. As far as I know there is no way around that. Mockito needs to add a proxy to the objects and someone must tell Mockito which objects to proxy.

jwehrle Over a year ago

Instead of saying "//do stuff" it might be helpful to add that it is the "anotherObjSpy" that must make the method call being tested.

argoth Over a year ago

Thanks @jwehrle, you need to use the anotherObjSpy in the calls, otherwise the tests won't work.

Akshay Hazari Over a year ago

I have a final method which I can't call spy on

CodeHunter · Accepted Answer · 2020-04-29 22:26:59Z

14

Annotate the non-mock object with @Spy annotation and then check for verify(). Check this

answered Apr 29, 2020 at 22:26

CodeHunter

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2 Comments

firstpostcommenter Over a year ago

Nice. works fine if we dont have to initialise the @Spy annotated object. But if we want to initialise it in @Before then dont use @Spy annotation but do it inside the @Test class as "val someName = Mockito.spy(objectYouWantToSpy)"

Murukan Over a year ago

I have used @SpyBean for a @SpringBootTest integration test - more details

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