What Is Stub Used For

A stub may simulate the behavior of existing code (such as a procedure on a remote machine; such methods are often called mocks) or be a temporary substitute for yet-to-be-developed code. Stubs are therefore most useful in porting, distributed computing as well as general software development and testing.

What is the spy method?

A spy is the other type of test double that Mockito creates. In contrast to mocks, creating a spy requires an instance to spy on. By default, a spy delegates all method calls to the real object and records what method was called and with what parameters. That’s what makes it a spy: It’s spying on a real object.

What is difference between spy and mock?

Mocks are used to create fully mock or dummy objects. It is mainly used in large test suites. Spies are used for creating partial or half mock objects. Like mock, spies are also used in large test suites.