Mockito: verify function being called with an argument that has deep nested objects

Question

I have this class and a unit test to verify a function being called with an argument which is a list of objects that has nested objects.

   @Data
   class Test {
      private String name;
      private User user;
   }

   @Data
   class User {
       private String name;
   }


   service.somemethod(List.of(
                new Test("test1", new User("user1")),
                new Test("test1", new User("user1"))
            ));

My test code:

Service spyService = Mockito.spy(service);
  verify(spyService, times(1)).somemethod(eq(List.of(
                new Test("test1", new User("user1")),
                new Test("test1", new User("user1"))
            )));

This will give me an error that User does not match. I see it is trying to compare User by address instead of value. How can I make it so that it will compare the nested object by value? I tried adding eq() around new User() but it throws another error saying eq can't be used there

Answer 1

if you create seprate list variable and passed it to the spied function and to the verify function it will work:

@Test
public void test_spy_2() {
    
    BusinessImpl businessImpl_spied = spy(BusinessImpl.class);
    
    List<Depratment> list = List.of(
            new Test("test1", new User("user1")),
            new Test("test1", new User("user1"))
        );
    
    businessImpl_spied.testCallList(list);
    
    verify(businessImpl_spied).testCallList(ArgumentMatchers.eq(list));
    
}