Using @Spy and @Autowired together

Question

I have a Service Class with 3 methods, Service class is also using some @Autowired annotations. Out of 3 methods, I want to mock two methods but use real method for 3rd one.

Answer 1

Using @Spy together with @Autowired works until you want to verify interaction between that spy and a different component that spy is injected into. What I found to work for me was the following approach found at https://dzone.com/articles/how-to-mock-spring-bean-version-2

@Configuration
public class AddressServiceTestConfiguration {
    @Bean
    @Primary
    public AddressService addressServiceSpy(AddressService addressService) {
        return Mockito.spy(addressService);
    }
}

This turns your autowired component into a spy object, which will be used by your service and can be verified in your tests.