Testing Anti-Patterns Guard

About

This skill acts as an automated mentor for Claude Code, ensuring that test suites remain robust and maintainable. It enforces 'Iron Laws' that prevent developers from testing mock behavior rather than real logic, polluting production code with test-only methods, and creating incomplete mocks that lead to silent failures. By integrating gate functions into the development workflow, it encourages a strict TDD approach that identifies architectural flaws early and ensures tests provide real value rather than false confidence.

Key Features

• Blocks test-only methods from entering production classes to maintain separation of concerns
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• Prevents assertions on mock elements to ensure real component behavior is verified
• Promotes strict TDD cycles to ensure implementation follows test requirements
• Validates mock completeness against real API structures to avoid downstream errors
• Enforces dependency analysis before mocking to prevent broken test logic

Use Cases

• Refactoring brittle test suites that fail due to implementation details rather than logic errors
• Guiding junior developers in writing meaningful tests that avoid common mocking pitfalls
• Enforcing clean code standards during the transition from unit to integration testing