Write Tests Skill

When writing tests, follow this structured process. Good tests verify behavior, catch regressions, and serve as living documentation.

1. Discovery — Understand What to Test

Before writing any tests, analyze the code:

Detect Testing Setup

# Detect framework and config
cat package.json 2>/dev/null | grep -E "jest|vitest|mocha|ava|playwright|cypress|testing-library"
cat jest.config.* vitest.config.* 2>/dev/null | head -30
cat pyproject.toml 2>/dev/null | grep -A 20 "\[tool.pytest"
cat pytest.ini conftest.py 2>/dev/null | head -20
cat .rspec spec/spec_helper.rb 2>/dev/null | head -20
cat phpunit.xml 2>/dev/null | head -20

# Find existing test examples to match patterns