CODEWITHSUNDEEP
javamockitospy
jvdecamargo
jvdecamargo

Reputation: 73

How to capture an argument with Mockito and execute real method?

I have some integration tests that use Mockito, and they are working fine.

However, I want to verify that the input of a method that is called some time during the process I'm testing. The thing is: I don't want to mock the method behavior, only to inspect its argument and execute the real method. If I do something like this:

@MockBean
private ClassThatIsCalled classThatIsCalled;
@Captor
private ArgumentCaptor<TypeOfMyParameter> typeOfMyParameter;

I get an error because a dependency of ClassThatIsCalled was not found. Even If I do given(classThatIsCalled.callMethod(any())).willCallRealMethod(); I'm still mocking ClassThatIsCalled which is not what I want to do.

Is there a way to call the productive code of ClassThatIsCalled (without mocking it) and simply inspect the passed argument?

TL;DR: I want to use @Spy/@Captor/similar to inspect an argument passed to a class, but without mocking the class, but calling its real method (using .willCallRealMethod() is not enough, since a mocked class has no dependencies injected).

Upvotes: 0

Views: 830

Answers (1)

knittl
knittl

Reputation: 265155

You should be able to use @SpyBean:

Annotation that can be used to apply Mockito spies to a Spring ApplicationContext. Can be used as a class level annotation or on fields in either @Configuration classes, or test classes that are @RunWith the SpringRunner.

Spies can be applied by type or by bean name. All beans in the context of a matching type (including subclasses) will be wrapped with the spy. If no existing bean is defined a new one will be added. Dependencies that are known to the application context but are not beans (such as those registered directly) will not be found and a spied bean will be added to the context alongside the existing dependency.

@ExtendWith(SpringExtension.class)
class YourTest {
  @SpyBean
  private ClassThatIsCalled classThatIsCalled;
  @Captor
  private ArgumentCaptor<TypeOfMyParameter> typeOfMyParameter;

  // ...
}

Upvotes: 0

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