# Unit Testing flash cards: Master level

3 Unit Testing terms at the Master level, as flash cards.

Updated: September 27, 2026

- [Study these as flash cards](https://www.ask-codey.com/decks/unit-testing/5/flash)
- [Play Memory with them](https://www.ask-codey.com/games/memory?category=unit-testing&level=5)

## Terms in this deck

- [Approval Testing](https://www.ask-codey.com/glossary/approval-testing): Comparing output against an approved file.
- [Characterization Test](https://www.ask-codey.com/glossary/characterization-test): A test recording what existing code does today.
- [Mutation Testing](https://www.ask-codey.com/glossary/mutation-testing): Deliberately breaking code to check tests notice.

[Read them in the glossary](https://www.ask-codey.com/glossary/subjects/unit-testing/master)

Source: https://www.ask-codey.com/decks/unit-testing/master