Does this skill help with TDD?

Yes, it encourages the TDD cycle of writing a failing test first, which naturally prevents many anti-patterns like production code pollution and unnecessary mocking.

What are testing anti-patterns?

Testing anti-patterns are common mistakes such as testing that a mock exists instead of verifying real behavior, adding test-only methods to production code, or using incomplete mocks that mask structural errors.

How does this skill improve my test suite?

It provides Claude with a set of 'Gate Functions'—logical checkpoints that force the AI to justify every mock and prevent the addition of brittle assertions that cause tests to fail for the wrong reasons.

Why is mocking behavior considered an anti-pattern?

Testing mock behavior verifies that the mock works, not the code. This leads to tests that pass even when the real component is broken and fail whenever the mock implementation is updated.

Testing Anti-Patterns Guard

Name: Testing Anti-Patterns Guard
Author: seanGSISG

byseanGSISG

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보안 및 테스팅

Prevents fragile tests and production code pollution by enforcing strict best practices for mocking and Test-Driven Development.

The Testing Anti-Patterns skill equips Claude with a rigorous framework for identifying and avoiding common software testing mistakes. By implementing 'Iron Laws' and 'Gate Functions,' the skill ensures that tests verify real application behavior rather than the behavior of mocks. It prevents the pollution of production code with test-only methods, stops the creation of incomplete mock data structures, and promotes a healthy Test-Driven Development (TDD) cycle. This skill is essential for maintaining a clean, maintainable codebase where tests provide genuine confidence in system stability.

주요 기능

01Enforces Iron Laws to stop testing mock behavior and production code pollution

02Identifies red flags like overly complex mock setups and tests that fail without mocks

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04Prevents the creation of test-only methods in production classes

05Ensures mock responses mirror complete, real-world API data structures

06Uses Gate Functions to validate the necessity and scope of mocks before implementation

사용 사례

01Implementing new features using strict TDD to ensure code quality from the start

02Auditing production classes to move test-specific logic into dedicated utility files

03Refactoring fragile test suites that rely on implementation details rather than behavior

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add seangsisg/crispy-claude testing-anti-patterns

For use in Claude.ai and ChatGPT

Download Skill