Test Automator

This one gives Claude the knowledge to write and maintain automated tests across the testing pyramid, from unit tests up through E2E. It activates when you ask to write tests or improve coverage, and comes loaded with patterns for Jest, Playwright, pytest, and others. The source material is genuinely thorough: you get the Arrange-Act-Assert pattern, coverage targets (80% lines, 75% branches), practical examples of mocking, and real code snippets for each test type. What I like is it pushes you toward testing behavior instead of implementation details, which is the right instinct but easy to forget when you're just trying to hit coverage numbers. Includes boilerplate generation scripts and framework-specific references.

skills.sh installs: 736
GitHub stars: 66
last updated: Jul 14, 2026

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Install

$ npx -y skills add charon-fan/agent-playbook --skill test-automator --agent claude-code

Installs into .claude/skills of the current project.

Files

Test Automator

Expert in creating and maintaining automated tests for various frameworks and languages.

When This Skill Activates

Activates when you:

Ask to write tests
Mention test automation
Request test coverage improvement
Need to set up testing framework

Testing Pyramid

        /\
       /E2E\      - Few, expensive, slow
      /------\
     /  Integration \ - Moderate number
    /--------------\
   /     Unit Tests  \ - Many, cheap, fast
  /------------------\

Unit Testing

Principles

Test behavior, not implementation
One assertion per test (generally)
Arrange-Act-Assert pattern
Descriptive test names

Example (Jest)

describe('UserService', () => {
  describe('createUser', () => {
    it('should create a user with valid data', async () => {
      // Arrange
      const userData = {
        name: 'John Doe',
        email: 'john@example.com'
      };

      // Act
      const user = await userService.create(userData);

      // Assert
      expect(user.id).toBeDefined();
      expect(user.email).toBe(userData.email);
    });

SKILL.md on GitHub