Javascript Testing Patterns

1---
2name: javascript-testing-patterns
3description: 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.
4---
5 
6# JavaScript Testing Patterns
7 
8Comprehensive guide for implementing robust testing strategies in JavaScript/TypeScript applications using modern testing frameworks and best practices.
9 
10## Use this skill when
11 
12- Setting up test infrastructure for new projects
13- Writing unit tests for functions and classes
14- Creating integration tests for APIs and services
15- Implementing end-to-end tests for user flows
16- Mocking external dependencies and APIs
17- Testing React, Vue, or other frontend components
18- Implementing test-driven development (TDD)
19- Setting up continuous testing in CI/CD pipelines
20 
21## Do not use this skill when
22 
23- The task is unrelated to javascript testing patterns
24- You need a different domain or tool outside this scope
25 
26## Instructions
27 
28- Clarify goals, constraints, and required inputs.
29- Apply relevant best practices and validate outcomes.
30- Provide actionable steps and verification.
31- If detailed examples are required, open `resources/implementation-playbook.md`.
32 
33## Resources
34 
35- `resources/implementation-playbook.md` for detailed patterns and examples.
36