Mockito : given an instance of Class return the same instance

Question

I m trying to use mockito to mock a service. However I m not finding a way to say to mockito that given an instance of a class return me the same instance :

Something like :

  given(service.add(any(Individual.class)).willReturn(any(Individual.class));

any Idea how may I do that ?

Answer 1

You can analyze invocation to access argument.

    given(service.add(any(Individual.class)))
            .will(invocation -> invocation.getArgument(0));

Answer 2

You could use AdditionalAnswers.returnsFirstArg() :

when(service.add(any(Individual.class)).then(AdditionalAnswers.returnsFirstArg());

or with the BDD wrapper :

given(service.add(any(Individual.class)).willReturn(AdditionalAnswers.returnsFirstArg());