react-testing SKILL.md skillA
react-testing from affaan-m/ecc is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add affaan-m/ecc/react-testing@git:20260607.4ad5756Pins git:20260607.4ad5756 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- affaan-m/ecc
- Path
.kiro/skills/react-testing/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260607.4ad5756, committed Jun 7, 2026
- Size
- 13,156 bytes
- Repository stars
- 293,827
- License
- MIT
React component testing with React Testing Library, Vitest/Jest, MSW for network mocking, accessibility assertions with axe, and the decision boundary between component tests and Playwright/Cypress end-to-end runs. Use when writing or fixing tests for React components, hooks, or pages.
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 Comprehensive React testing patterns for behavior-focused component tests, custom hook tests, accessibility assertions, and network-level mocking. ## When to Activate - Writing tests for React components, custom hooks, or pages - Adding test coverage to legacy untested components - Migrating from Enzyme or class-component-era patterns to React Testing Library - Setting up Vitest or Jest for a new React project - Mocking HTTP requests in tests - Asserting accessibility violations - Deciding which tests belong in RTL vs Playwright Component Testing vs full E2E ## Core Principle Test what the user sees and does, not implementation details. A test should: - Render the component with the same providers it has in production - Interact with it via accessible queries (role, label) and `userEvent` - Assert visible output and observable side effects (callback fired, request sent) A test should NOT: - Inspect component state, props passed to children, or which hooks were called - Mock React itself or framework hooks - Assert on the number of renders or DOM structure beyond what affects users ## Library Choice | Runner | When | Note | |---|---|---| …
Read the whole file at its exact version.
How to install
mdr add affaan-m/ecc/react-testing@sha256:82ecdce94f7f058eThe line at the top of this page pins the label git:20260607.4ad5756, 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_czyxh5po3k6tcmd7)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Jun 7, 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 (13156 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
affaan-m/ecc · 293,827 stars · license MIT · pushed 2026-10-30 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_czyxh5po3k6tcmd7 GET https://markdownregistry.com/api/v1/resolve?ref=affaan-m/ecc/react-testing GET https://markdownregistry.com/api/v1/blob/82ecdce94f7f058e1e44bcf0cdfa67fd48f15106afec854a54b81c61d6f59771
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.