Pragmatic Unit Testing in Java with JUnit, 3rd Edition

Verifying a Method Was Called…or Not

As an alternative to when(...).thenReturn(...), you might want to verify that a certain method was called with the proper arguments as part of processing. The typical case for this need is when you’re invoking a consumer—a method that has side effects but returns nothing. Mockito helps you verify that such a method was called with its verify functionality.

Update the AddressRetriever to tell an Auditor instance to add audit information when the country code returned is a non-U.S. country code:

utj3-mock-objects/08/src/main/java/com/langrsoft/domain/AddressRetriever.java

public class AddressRetriever {
    private Auditor auditor = new ApplicationAuditor();
    // ...
    public Address retrieve(