# jest

> Use this tool when you need to run JavaScript or TypeScript unit and integration tests. It provides built-in assertion libraries, mocking capabilities, snapshot testing, and code coverage reporting with zero configuration.

Canonical page: https://skillsregistry.net/skills/jest  
JSON: https://api.skillsregistry.net/v1/skills/jest

## Description

JavaScript testing framework with built-in assertions, mocking, and code coverage. Zero-config for most projects.

## Trust

- **Trust score (0–1):** 0.30
- **Verification tier:** unverified
- **Last scanned:** 2026-09-02

## Facts

- **Version:** 29.0.0
- **Skill type:** atomic
- **Execution layer:** worker
- **Runtime environment:** api
- **Category:** other
- **Tags:** testing, javascript, typescript, unit-testing, coverage
- **Updated:** 2026-09-02

## Source

- **Source listing:** MCP Registry

## Use it

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "jest"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/jest` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/jest/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt