Individual skill
testing-web
Use when writing or fixing frontend unit, component or custom-hook tests with Vitest or Jest plus Testing Library — rendering a component in jsdom, testing a hook in isolation, choosing between sync and async queries, silencing act warnings, mocking fetch, or migrating a Jest suite to Vitest. NOT real-browser multi-page journeys (that is `e2e-testing`), NOT pytest suites (that is `testing-py`), NOT accessibility auditing (that is `accessibility`).
skills/testing-web/SKILL.md
Source commit d9d6bb338f66cc1e23998585e580a0ea45bbcb82
What was checked
- Matches the observed repository HEAD
- Yes
- Scanner rules are current
- Yes
- Repository scan complete
- No
- Skill scan complete
- No
- Observed behavior
- Network or broad shell
- Last checked
- Nov 10, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
Install this skill
Choose an agent in your Stack or copy a command below. Commands fetch the pinned commit and copy only this skill directory. Existing destinations are refused. Copying a command does not install anything.
An install command is unavailable: current rules, complete repository and skill scans, an eligible behavior level and a permitted license are required.
Repository context
- Repository stars (not skill ratings)
- 578
- Repository last updated
- Nov 9, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- agent-skills Repository topic
- agentic-ai Repository topic
- ai-agents Repository topic
- ai-coding Repository topic
- claude-code Repository topic
- cli Repository topic
- cline Repository topic
- codex Repository topic
- coding-assistant Repository topic
- cursor Repository topic
- testing Declared skill tag
- frontend Declared skill tag
- vitest Declared skill tag
- jest Declared skill tag
- testing-library Declared skill tag
- react Declared skill tag
- hooks Declared skill tag
- component-testing Declared skill tag
- jsdom Declared skill tag
- testing Derived category
- writing Derived category
- engineering Derived category
- engineering-web Derived category
Files and excerpt
File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.
Browse files
SKILL.mdcore · 13,299 bytesSKILL.mdcore · 13,299 bytesSKILL.mdcore · 13,299 bytesSKILL.mdcore · 13,299 bytesevals/README.mddoc · 907 bytesevals/cases.yamlasset · 3,735 bytesreferences/jest-setup.mddoc · 3,022 bytesreferences/recipes.mddoc · 3,780 bytesscripts/verify.shruns · 4,125 bytes
Read excerpt
# testing-web — fast, trustworthy component and hook tests
A frontend test is only worth keeping if it survives a refactor and fails for the right reason.
The way to get there is boring and non-negotiable: render the thing, query it the way a user finds
it, drive it with real events, and assert on what the user can see. Everything in this skill bends
toward that. Tests that reach into `className`, `state`, props, or instance methods pass while the UI
is broken and break while the UI is fine — delete that instinct.
## What this owns / what it doesn't
This skill owns unit, component, and custom-hook tests that run in a simulated DOM (jsdom) or Vitest
Browser Mode at component granularity. The moment scope crosses a boundary, switch skills:
- Real browser driving a whole app, page navigation, multi-page login-to-dashboard journeys -> [`../e2e-testing/SKILL.md`](../e2e-testing/SKILL.md).