# Axiom Testing

Use when writing ANY test, debugging flaky tests, making tests faster, or choosing...

- Repository: https://github.com/CharlesWiltgen/Axiom (1242 stars)
- Category: Design
- License: MIT
- Last updated: 2026-10-31
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add CharlesWiltgen/Axiom --skill axiom-testing -g -a claude-code -y`
Codex: `npx skills add CharlesWiltgen/Axiom --skill axiom-testing -g -a codex -y`
Cursor: `npx skills add CharlesWiltgen/Axiom --skill axiom-testing -g -a cursor -y`
Gemini CLI: `npx skills add CharlesWiltgen/Axiom --skill axiom-testing -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add CharlesWiltgen/Axiom`

## Description

Use when writing ANY test, debugging flaky tests, making tests faster, or choosing Swift Testing vs XCTest. Covers unit tests, UI tests, async testing, test architecture.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Testing

**You MUST use this skill for ANY testing-related question, including writing tests, debugging test failures, making tests faster, or choosing between testing approaches.**

**Bundled tools on Claude Code:** if `command -v <tool>` finds nothing (hooks off or `--bare`), use `<plugin-root>/tools/<tool>` in place of the bare name; `<plugin-root>` is two levels above this skill's `Base directory for this skill:` path.

<!-- AXIOM_AUDITOR_INLINE_BEGIN, auto-maintained by scripts/build-inlined-auditors.ts; do not hand-edit -->
> **Can't launch Axiom agents?** Where this router sends you to an agent, follow its procedure inline. Over MCP, `axiom_get_agent` returns it; elsewhere, read its file below, which needs only file search and read.
>
> Available here: `skills/test-failure-analyzer.md`, `skills/testing-auditor.md`.
>
> For any other agent, over MCP `axiom_get_agent` returns it too; run its xclog, xcsym and xcprof steps with the `axiom_xclog_*`, `axiom_xcsym_*` and `axiom_xcprof_*` tools. Elsewhere, search Axiom's skills for `skills/<agent>.md`; if there is none, do that work yourself with this suite's skills, using any Axiom tool on your `PATH`.
<!-- AXIOM_AUDITOR_INLINE_END -->

## Quick Reference

The rest: https://github.com/CharlesWiltgen/Axiom/blob/HEAD/.claude-plugin/plugins/axiom/skills/axiom-testing/SKILL.md