When should I use mocking according to these principles?

Mocks should be used for external dependencies like APIs and databases, slow operations, or unpredictable behaviors to keep tests fast and isolated.

What level of code coverage does this skill recommend?

It suggests a minimum of 80% code coverage for production environments, focusing specifically on critical business logic and paths.

What is the AAA pattern mentioned in the skill?

AAA stands for Arrange-Act-Assert, a pattern that structures tests into three clear phases to improve readability and maintenance.

How does this skill assist with Test-Driven Development (TDD)?

It provides a structured Red-Green-Refactor workflow to help you write failing tests first, implement minimal code, and refactor for quality.

Is this skill specific to a particular programming language?

No, the principles are language-agnostic and can be applied to any environment, including JavaScript, Python, Go, Java, and more.

Testing Principles

Name: Testing Principles
Author: Tahir-yamin

byTahir-yamin

•

Security & Testing

Implements language-agnostic testing standards and TDD workflows to ensure high-quality, reliable, and maintainable software.

This skill provides a comprehensive framework for writing high-quality code across any programming language by enforcing industry-standard testing principles. It guides users through the Red-Green-Refactor TDD cycle, defines clear boundaries between unit, integration, and E2E tests via the test pyramid, and establishes rigorous quality standards like the AAA (Arrange-Act-Assert) pattern and 80% code coverage. Whether you are building a new feature or refactoring legacy code, this skill ensures your test suite remains fast, deterministic, and effective at catching regressions.

Key Features

01Rigorous quality standards for coverage and test isolation

023 GitHub stars

03Best practices for mocking and test double implementation

04Language-agnostic test design patterns including AAA

05Clear classification for Unit, Integration, and E2E testing

06Standardized TDD workflow guidance (Red-Green-Refactor)

Use Cases

01Establishing standardized testing strategies for cross-functional teams

02Refactoring legacy code with characterization tests

03Implementing Test-Driven Development for new features

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add tahir-yamin/dev-engineering-playbook testing-principles

For use in Claude.ai and ChatGPT

Download Skill