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Testing Anti-Patterns Guard is a specialized Claude Code skill designed to improve software quality by identifying and preventing common pitfalls in unit and integration testing. It enforces the 'Iron Laws' of testing—ensuring mocks are used for isolation rather than verification—and prevents production code pollution by keeping test-only logic in utility files. By guiding developers through TDD cycles and providing 'Gate Functions' before mocking, it ensures that tests verify real business behavior while maintaining complete, accurate data structures.