# Test Writer > Generate comprehensive test coverage for existing code. Use when writing or expanding tests. Use when this capability is needed. - Skill: `tomevault-io/test-writer-3` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/test-writer-3` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/test-writer-3/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/test-writer-3 --- # /write-tests Command Generate comprehensive test coverage for existing code. ## What This Command Does 1. Analyzes code to test 2. Identifies test cases (happy path, edge cases, errors) 3. Generates test code in appropriate framework 4. Includes setup/teardown as needed ## Usage `/write-tests [file or function]` ## Test Generation Approach - Uses existing test framework in project - Follows project test patterns - Includes meaningful test names - Covers edge cases and error conditions - Adds necessary mocks/fixtures ## Best Practices - Review generated tests for accuracy - Adjust assertions as needed - Run tests to verify they pass - Add tests incrementally for large files --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/nimbalyst) — claim your Tome and manage your conversions.