# Unit Testing glossary: Freelancer level

7 Unit Testing terms at the Freelancer level, each with a short definition and a link to its full page.

Updated: October 16, 2026

[Study these as flash cards](https://www.ask-codey.com/decks/unit-testing/freelancer)

- [Contract Test](https://www.ask-codey.com/glossary/contract-test): Checks a service still matches its agreed contract.
- [Flaky Test](https://www.ask-codey.com/glossary/flaky-test): A test that passes or fails at random.
- [Locator](https://www.ask-codey.com/glossary/locator): A way to find elements by role, label or text.
- [Playwright](https://www.ask-codey.com/glossary/playwright): A tool for automated end-to-end browser tests.
- [Property-Based Testing](https://www.ask-codey.com/glossary/property-based-testing): Checking a rule against many generated inputs.
- [Test Isolation](https://www.ask-codey.com/glossary/test-isolation): Each test stands alone, independent of others.
- [Testcontainers](https://www.ask-codey.com/glossary/testcontainers-unit-testing): Real databases in throwaway Docker containers for tests.

- Previous level: [Journeyman](https://www.ask-codey.com/glossary/subjects/unit-testing/journeyman)
- Next level: [Master](https://www.ask-codey.com/glossary/subjects/unit-testing/master)

[Every Unit Testing term, by level](https://www.ask-codey.com/glossary/subjects/unit-testing)

Source: https://www.ask-codey.com/glossary/subjects/unit-testing/freelancer