I am trying to use Mockito for testing in my project. I’ve come across the doCallRealMethod() method and I’m not sure how to properly implement it. Can someone provide an example or explain the scenario where this method is useful? I’m particularly interested in understanding any specific setup or common pitfalls to avoid.
Hey! doCallRealMethod() is a great option when you want part of a method to execute the real code in a mock setup. I usually use it for testing abstract classes or when only certain methods in a stub need to function as they normally would. Just remember, you should place doCallRealMethod() before calling the method on your mock. It’s super handy for those unique cases where you can’t fully mock a behavior!
Based on my experience, doCallRealMethod() is really helpful for partially mocking behavior in tests. For instance, when dealing with default or existing implementations in abstract classes. You set it up similar to when() but with doCallRealMethod(). Just make sure the method you want to call isn’t totally abstract or missing implementation, otherwise it’ll fail. Good cases include when you’ve overridden a method and you want to ensure the base implementation runs while changing behavior elsewhere.
In practice, doCallRealMethod() is useful when you’re testing a class method without defining a full mock for it. I used it when I had an abstract class where only certain methods were fully implemented in child classes. Tricky part: always ensure your method won’t throw exceptions due to unimplemented parts. Set it up with a test double using doCallRealMethod(). It can be a real time-saver, especially when you only want to mock parts of the behavior without losing the initial functionality.