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This skill equips Claude with the principles for creating efficient and maintainable test suites by emphasizing behavior over implementation details. It guides the creation of minimal, focused tests for core business logic, ensuring that critical user journeys are validated without over-testing edge cases. By utilizing strategic mocking for external dependencies and adhering to descriptive naming conventions, it helps maintain high-speed test execution and reduces test brittleness during code refactors across popular frameworks like Jest, RSpec, and pytest.