react-testing SKILL.md skillA
react-testing from leahycc/claude-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add leahycc/claude-skills/react-testing@git:20261101.7fd4399Pins git:20261101.7fd4399 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- leahycc/claude-skills
- Path
skills/react-testing/SKILL.md- Versions recorded
- 1
- Latest version
- git:20261101.7fd4399, committed Nov 1, 2026
- Size
- 6,409 bytes
- Repository stars
- 3
- License
- MIT
Writes and reviews React component tests with Vitest 5, React Testing Library 16, user-event 14, jest-dom 7, and MSW 3: query priority and accessible names, asserting absence, user-event setup, findBy and waitFor rules, act warnings, the Vitest fake-timer hang, cleanup without globals, jsdom gaps, custom renders with providers, renderHook, MSW handlers and error paths, vi.mock and next/navigation, and what async Server Components can and cannot do under RTL. Use when writing, fixing, or…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# React testing
Tests that fail when the feature breaks and pass when it works, whatever the internals look like. Find elements the way a user does, act the way a user does, and wait for what a user would see.
**Query by role and name first. If you cannot, the component probably has an accessibility bug.**
**Mock the edges (network, clock, framework), never your own code.**
Versions, source checks, and dates: [SOURCES.md](SOURCES.md).
## Procedure
1. Read the component, its existing tests, `vitest.config.*`, and the setup file. Check the package versions; this skill assumes the stack in SOURCES.md.
2. Pick what the user does and what they should see as a result. That pair is the test.
3. Route by what the test needs, and load only that resource:
```
writing or fixing a test
|
+-- finding an element, asserting present or absent ...... queries.md
|
+-- clicking, typing, tabbing, uploading .................. user-events.md
|
+-- something appears later, a timer, an act warning ...... async.md
|
+-- config, cleanup, providers, hooks, jsdom crashes ...... setup.md
|
…Read the whole file at its exact version.
How to install
mdr add leahycc/claude-skills/react-testing@sha256:454868c1fb4af721The line at the top of this page pins the label git:20261101.7fd4399, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_aqdrif34wfpbuf4a)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Nov 1, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6409 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
leahycc/claude-skills · 3 stars · license MIT · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_aqdrif34wfpbuf4a GET https://markdownregistry.com/api/v1/resolve?ref=leahycc/claude-skills/react-testing GET https://markdownregistry.com/api/v1/blob/454868c1fb4af7217923125cc7f02c2ec40d8e288fdf7e4de539514e2bd2ce11
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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