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Testify

Category: Engineering  ·  Sub-category: testing  ·  Last updated:
lang:pythontype:integration
Stand up a project's tests and prove they're worth anything. Where /start-project writes docs/TESTING.md (the intent, meaning the bar, the layers, the runner) but doesn't touch code, testify does the doing. It detects the stack, wires the runner, writes real tests across the layers (unit, integration + happy-path, e2e for UI), and then VERIFIES them by breaking the code on purpose. A test that stays green on broken code is theater. Runs in two modes, `full` (all layers + automated mutation testing + property tests) and `light` (the happy-path floor, meaning does it boot and respond, verified by hand-mutation, no automated gate). Reconciles docs/TESTING.md with what it actually built. Trigger on "/testify", "set up testing", "add tests to this project", "this project has no tests", "wire up the test suite", "write tests for this", "just make sure it runs".
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From the source SKILL.md

The repo's other doors write about the project. /start-project surveys the stack and writes docs/TESTING.md, the intent behind a suite: the bar, the layers, the runner, where tests live. But it explicitly stops there; it doesn't write a line of test code. Testify is the door that does the testing. It wires the runner, writes the actual tests, and (the part that matters) proves they assert something by breaking the code and watching them fail. Then it reconciles docs/TESTING.md with what it really built.

What this skill does

Testify is a community-contributed Claude Code skill in the testing sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/testify/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Testify Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 211,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/testify
curl -L https://claudskills.com/skills/testify/SKILL.md \
  -o ~/.claude/skills/testify/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/testify/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/testify/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\testify\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Testify Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/testify/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Testify skill do?
Stand up a project's tests and prove they're worth anything. Where /start-project writes docs/TESTING.md (the intent, meaning the bar, the layers, the runner) but doesn't touch code, testify does the doing. It detects the stack, wires the runner, writes real tests across the layers (unit, integration + happy-path, e2e for UI), and then VERIFIES them by breaking the code on purpose. A test that stays green on broken code is theater. Runs in two modes, `full` (all layers + automated mutation testing + property tests) and `light` (the happy-path floor, meaning does it boot and respond, verified by hand-mutation, no automated gate). Reconciles docs/TESTING.md with what it actually built. Trigger on "/testify", "set up testing", "add tests to this project", "this project has no tests", "wire up the test suite", "write tests for this", "just make sure it runs".
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Testify skill?
Use Testify when your Claude Code task falls under the Engineering category — specifically in the testing area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Testify" or describe the task and let Claude pick). Browse related skills at /category/engineering/.
What is a Claude Code skill and how does the Testify skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Testify is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
NirDiamant. (2026). Testify [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/testify/
BibTeX
@misc{testify-2026,
  author    = {NirDiamant},
  title     = {Testify [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/testify/}
}

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Browse all Engineering skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Engineering skills → Top 100 skills
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