# Characterization Test

A test recording what existing code does today.

## What is **Characterization Test**?

A **characterization test** records what existing (often legacy) code currently does, so you can change it safely.

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

Updated: September 27, 2026

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