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Implementation Details in Tech Management

Learn about Implementation Details in this comprehensive Tech Management tutorial. Brittle tests.

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1The Anti-Pattern

A junior writes a test that checks if component.state.count === 1. This is testing an 'implementation detail'. If you refactor to use hooks instead of classes, the test breaks even if the app still works perfectly. Mid-levels test BEHAVIOR: expect(screen.getByText('1')).toBeInTheDocument(). Behavior-driven tests survive refactors.