# Test Double

Any stand-in object used in a test.

## What is **Test Double**?

**Test double** is the umbrella term for any stand-in used in tests: mocks, stubs, fakes, spies and dummies.

Level: Journeyman · [More Unit Testing terms at this level](https://www.ask-codey.com/glossary/subjects/unit-testing/journeyman)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/test-double