Testing Strategist

This one teaches Claude the testing pyramid philosophy: 70% unit tests, 20% integration, 10% end-to-end. It pushes five core principles (fast, isolated, repeatable, self-checking, timely) and aims to help you write tests at the right level of abstraction. If you've ever caught yourself writing too many brittle E2E tests or skipping unit tests entirely, this gives Claude a framework to push back and suggest better coverage strategies. It's opinionated in a good way, the kind of testing discipline that prevents "works on my machine" situations. Comes from daffy0208's ai-dev-standards repo, so it's meant to keep standards consistent across a codebase.

GitHub stars: 33
last updated: Aug 21, 2026

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Install

$ npx -y skills add daffy0208/ai-dev-standards --skill 'Testing Strategist' --agent claude-code

Installs into .claude/skills of the current project.

Files

Testing Strategist

Test the right things at the right level - write tests that give you confidence to ship.

Core Principle

The Testing Pyramid: 70% unit tests, 20% integration tests, 10% E2E tests.

Tests should be:

Fast - Run in milliseconds (unit) to seconds (integration) to minutes (E2E)
Isolated - Test one thing at a time
Repeatable - Same input = same output
Self-checking - Pass/fail automatically, no manual verification
Timely - Written alongside code (or before, with TDD)

The Testing Pyramid

           /\
          /  \         E2E Tests (10%)
         /----\        - Slow, brittle, expensive
        /      \       - Test critical user journeys
       /--------\      - Example: "User can complete checkout"
      /          \
     /------------\    Integration Tests (20%)
    /              \   - Medium speed, test components together
   /----------------\  - Example: "API endpoint returns correct data"
  /                  \
 /--------------------\ Unit Tests (70%)
/______________________\ - Fast, isolated, test functions/components
                        - Example: "calculateTotal returns sum"

SKILL.md on GitHub