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The TDD Principle That Prevents Fragile Tests: Testing Behavior, Not Implementation
리팩토링 후에도 깨지지 않는 테스트: TDD의 가장 중요한 원칙
Why it matters
Most developers inadvertently couple tests to implementation details, creating fragile test suites that fail during refactoring. By testing behavior and contracts instead of internal implementation, you gain genuine confidence to refactor fearlessly and transform testing into a meaningful quality safeguard.
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TDDBehavior testingTest couplingCode refactoringUnit testing