Testing Anti-Patterns Guard

About

This skill serves as a rigorous guardian for software testing quality, specifically designed to eliminate fragile and misleading test patterns. It enforces 'The Iron Laws' of testing—preventing the verification of mock behavior, stopping the pollution of production code with test-only methods, and ensuring developers fully understand dependencies before mocking. By integrating gate functions into the workflow, it guides Claude to write more resilient, behavior-focused tests that align with strict TDD principles, ultimately improving code maintainability and reducing false-positive test results.

Key Features

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• Prevents production code pollution from test-only methods
• Enforces Iron Laws against testing mock behavior
• Validates dependency understanding before mocking
• Ensures complete mock data structures to mirror real APIs
• Promotes Test-Driven Development (TDD) best practices

Use Cases

• Refactoring legacy test suites to reduce brittleness and false positives
• Implementing new features while maintaining strict TDD standards
• Reviewing and improving mock implementations in complex unit tests