Question

//Let's import Mockito statically so that the code looks clearer
import static org.mockito.Mockito.*;

//mock creation
List mockedList = mock(List.class);

//using mock object
mockedList.add("one");
mockedList.clear();

//verification
verify(mockedList).add("one");
verify(mockedList).clear();

I don’t understand what is the point of this construct? How does it help? How is it different from just calling the functions?
The documentation is rather thin.
Thank you

Answer 1

You wish to test that some method Foo of class A calls some method Bar on an object of class B. In other words, you’re testing class A. During your test, you make a mock of class B. Then you pass this mock object to class A somehow (depending on how class A actually works). When your test runs the Foo method of class A, you are expecting the Bar method to get called on your mock of class B. By calling verify for the Bar method, after the test of the Foo method, you can check that the Foo method is actually working correctly – that it calls Bar.