Unit Testing & TDD · question
Question 2 of 91
What are the characteristics of a good unit test?
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Good unit tests follow the FIRST principles:
- Fast: Run quickly (milliseconds)
- Independent: Don't depend on other tests or external systems
- Repeatable: Produce consistent results
- Self-validating: Clear pass/fail result
- Timely: Written alongside production code
Additional characteristics:
- Readable: Clear names and structure
- Focused: Test one specific behavior
- Isolated: Use mocks/stubs for dependencies
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