What Is the Difference Between Stub and Mock

A Mock is just testing behaviour, making sure certain methods are called. A Stub is a testable version (per se) of a particular object.

Should I use mock or stub?

Mocks verify the behavior of the code you’re testing, also known as the system under test. Mocks should be used when you want to test the order in which functions are called. … Stubs don’t take order into account, which can be helpful for reducing the work of rewriting tests when code is refactored.

What is the difference between fake and mock?

The difference between testing with mocks vs fakes is that mocks are used to test behavior whereas fakes are used to test state. … Such a test is nothing but a duplication of the production code and needs to be maintained like it.