Writing Tests

Use this skill when the user asks to add tests to existing code, improve test coverage, or write tests for a specific file or module.

Steps

1. Detect the test setup — check what's already configured:

   # Check package.json for test runner
   cat package.json | grep -E "jest|vitest|mocha|playwright|cypress"
   

   Look for config files: vitest.config.ts, jest.config.ts, playwright.config.ts, .mocharc.*. Check for existing test files to understand the project's test patterns and conventions.

2. If no test runner exists — set one up:

   npm install -D vitest @testing-library/react @testing-library/jest-dom