Verifying Mock Interactions

Welcome to verifying mock interactions! After learning to create mocks, the next crucial step is to confirm how they were used.

Verification in Mockito means checking if specific methods on your mock objects were called during a test.

When testing a class, you often want to ensure it correctly interacts with its dependencies.

• Collaboration Check: Did the object under test call the right methods on its collaborators?
• Behavior Confirmation: Did it pass the correct arguments to those methods?
• Interaction Count: Was a method called once, multiple times, or not at all?

Verification answers these questions, ensuring your code behaves as expected.