jest

借助 Jest 实现单元测试、集成测试与快照测试。适用场景：在使用 Jest 编写或运行测试时触发。

SKILL.md

--- frontmatter

name: jest
description: "Unit, integration, and snapshot testing with Jest. Trigger: When writing or running tests with Jest."
compatibility: "javascript"
license: "Apache 2.0"
metadata:
  version: "1.0"
  skills:
    - conventions
    - typescript
    - javascript
  dependencies:
    jest: ">=29.0.0 <30.0.0"
  allowed-tools:
    - documentation-reader
    - web-search

Jest Skill

When to Use

•Unit, integration, or snapshot testing
•Testing JS/TS codebases
•Mocking dependencies

Critical Patterns

•Use describe/it for structure
•Use beforeEach/afterEach for setup/teardown
•Prefer jest.mock for isolation

Decision Tree

•Unit or integration? → Structure tests accordingly
•Need mocks? → Use jest.mock
•Async code? → Use async/await in tests

Edge Cases

•Mocking ES modules
•Flaky async tests
•Snapshot drift