javascript-testing-patterns SKILL.md skillA
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javascript-testing-patterns from hermeticormus/libreuiux-claude-code is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add hermeticormus/libreuiux-claude-code/javascript-testing-patterns@git:20251120.288a379Pins git:20251120.288a379 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- hermeticormus/libreuiux-claude-code
- Path
plugins/javascript-typescript/skills/javascript-testing-patterns/SKILL.md- Versions recorded
- 1
- Latest version
- git:20251120.288a379, committed Nov 20, 2025
- Size
- 26,058 bytes
- Repository stars
- 118
- License
- MIT
Implement comprehensive testing strategies using Jest, Vitest, and Testing Library for unit tests, integration tests, and end-to-end testing with mocking, fixtures, and test-driven development. Use when writing JavaScript/TypeScript tests, setting up test infrastructure, or implementing TDD/BDD workflows.
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
# JavaScript Testing Patterns
Comprehensive guide for implementing robust testing strategies in JavaScript/TypeScript applications using modern testing frameworks and best practices.
## When to Use This Skill
- Setting up test infrastructure for new projects
- Writing unit tests for functions and classes
- Creating integration tests for APIs and services
- Implementing end-to-end tests for user flows
- Mocking external dependencies and APIs
- Testing React, Vue, or other frontend components
- Implementing test-driven development (TDD)
- Setting up continuous testing in CI/CD pipelines
## Testing Frameworks
### Jest - Full-Featured Testing Framework
**Setup:**
```typescript
// jest.config.ts
import type { Config } from 'jest';
const config: Config = {
preset: 'ts-jest',
testEnvironment: 'node',
roots: ['<rootDir>/src'],
testMatch: ['**/__tests__/**/*.ts', '**/?(*.)+(spec|test).ts'],
collectCoverageFrom: [
'src/**/*.ts',
'!src/**/*.d.ts',
'!src/**/*.interface.ts',
],
coverageThreshold: {
global: {
branches: 80,
functions: 80,
lines: 80,
statements: 80,
},
},
setupFilesAfterEnv: ['<rootDir>/src/test/setup.ts'],
};
…Read the whole file at its exact version.
How to install
mdr add hermeticormus/libreuiux-claude-code/javascript-testing-patterns@sha256:91bd0860da653c2fThe line at the top of this page pins the label git:20251120.288a379, 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_7ow4xxjuxkri2qyh)
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Versions
The registry has recorded 1 version of this file, committed on Nov 20, 2025.
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 (26058 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
hermeticormus/libreuiux-claude-code · 118 stars · license MIT · pushed 2026-10-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_7ow4xxjuxkri2qyh GET https://markdownregistry.com/api/v1/resolve?ref=hermeticormus/libreuiux-claude-code/javascript-testing-patterns GET https://markdownregistry.com/api/v1/blob/91bd0860da653c2fc796b47be1e1f55c61d4e72ab0aaaf18509cfd2ca3805352
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