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.
NewMaintained
Automatic
◆QA & Test Engineering pack
Last verified 8/29/2026
What it changes
Passed 0 of 25 test cases with the skill, and 25 of 25 without it.
Without skill100%
With skill0%
0 fixed16 passed either way8 still failing1 broke
Pass-rate lift
-100 pp
Tokens
+1%
Agent turns
0%
Response time
-6%
Model gemini-3.6-flashMeasured 8/29/2026v116 of 25 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
What's inside
The instructions your model reads when the skill loads.
SKILL.md35 linessingle file
JavaScript Testing Patterns
Comprehensive guide for implementing robust testing strategies in JavaScript/TypeScript applications using modern testing frameworks and best practices.
Use this skill when
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
Do not use this skill when
The task is unrelated to javascript testing patterns
You need a different domain or tool outside this scope
Instructions
Clarify goals, constraints, and required inputs.
Apply relevant best practices and validate outcomes.
Provide actionable steps and verification.
If detailed examples are required, open resources/implementation-playbook.md.
Resources
resources/implementation-playbook.md for detailed patterns and examples.