Mockito Tutorial: Learn mocking with 25 Junit Examples - Step 13: Mockito Spy

The video tutorial explains the concept of spies in Mockito, how to create and use them, and their differences from mocks. It covers creating a mock, understanding the functionality of spies, and using spies to track method calls. The tutorial also discusses when to use spies versus mocks, emphasizing that spies are more suitable for legacy systems where code access is limited.

What is the default behavior of a mock when a method is called?

Describe how you would create a spy for an ArrayList in Mockito.

How can you verify method invocations when using a spy?

What are the potential drawbacks of using spies in real-world projects?