Testing terminology

Test Double

• A generic term for any kind of pretend object in place of real object.

Dummy

• Are Object passed but never used. usually to fill parameter list.

Fake

• Are Object actually working implementation but usually take some shortcut.

Stubs

• Provide canned answer to calls made during the test. usually not responding at all to anything outside test

• Mostly used to check State verification.

Spies

• Are Stubs that record some information based on how they were called. eg: email services

Mocks

• Are object; pre-programmed with expectations
• Mostly used to check behavior verification.