javascript-testing-patterns SKILL.md skillA
javascript-testing-patterns from wshobson/agents is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add wshobson/agents/javascript-testing-patterns@git:20260326.db33dbcPins git:20260326.db33dbc in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- wshobson/agents
- Path
plugins/javascript-typescript/skills/javascript-testing-patterns/SKILL.md- Versions recorded
- 4
- Latest version
- git:20260326.db33dbc, committed Mar 26, 2026
- First version recorded
- Oct 17, 2025
- Size
- 14,629 bytes
- Repository stars
- 42,320
- 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 wshobson/agents/javascript-testing-patterns@sha256:d99e1d7344ca7b87The line at the top of this page pins the label git:20260326.db33dbc, 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_67ty5pishxexddv2)
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Versions
The registry has recorded 4 versions of this file, between Oct 17, 2025 and Mar 26, 2026, about one every 53 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260326.db33dbc latest | 2026-03-26 | db33dbc | 14,629 B | A | view · diff |
| git:20260307.47a5dbc | 2026-03-07 | 47a5dbc | 25,741 B | A | view · diff |
| git:20260119.5684887 | 2026-01-19 | 5684887 | 25,964 B | A | view · diff |
| git:20251017.65e5cb0 | 2025-10-17 | 65e5cb0 | 26,058 B | A | view |
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 (14629 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
wshobson/agents · 42,320 stars · license MIT · pushed 2026-11-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_67ty5pishxexddv2 GET https://markdownregistry.com/api/v1/resolve?ref=wshobson/agents/javascript-testing-patterns GET https://markdownregistry.com/api/v1/blob/d99e1d7344ca7b87395c7e49f6c635ea67fe16d57f4698d72c78d405020f5782
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.
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