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write-tests

Write unit, integration, and end-to-end tests with Vitest, Testing Library, and Playwright.

Updated Aug 23, 2026
Search Tags:#unit tests#vitest#testing#integration testing#e2e#playwright#testing-library
One-click install
npx skills add https://github.com/4asaanAI/Claude-patches --skill write-tests-4asaanai
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: write-tests
Source: https://github.com/4asaanAI/Claude-patches/tree/main/framework-foundry/Claude%20Plugins/layaa-ai/skills/write-tests
Command: npx skills add https://github.com/4asaanAI/Claude-patches --skill write-tests-4asaanai

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Writing comprehensive, reliable tests is time-consuming and error-prone, and many teams lack consistent patterns for unit, integration, and end-to-end testing. This Skill provides clear guidelines and best practices to quickly produce tests that catch regressions and validate expected behavior.

Core Features & Use Cases

  • Test Strategy Guidance: Identify what to test (functions, components, endpoints, workflows) and how to prioritize happy paths, edge cases, and error scenarios.
  • Tooling Alignment: Matches Layaa AI test setup by recommending Vitest for unit tests, Testing Library for component interaction tests, and Playwright for E2E flows.
  • Safe Testing Practices: Emphasizes mocking external dependencies (Supabase, LLM calls) to avoid hitting real APIs and keeps tests focused with descriptive names and single-concept assertions.
  • Use Case: Convert a newly written UI component into a suite of tests that validate user interactions, edge-case inputs, and visual regressions in CI.

Quick Start

Write unit tests for the calculateDiscount function covering the standard discount case, boundary values, and an invalid input error case.

Frequently Asked Questions about write-tests

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I write unit tests that cover edge cases and error handling?▼

Writing unit tests for edge cases involves validating standard happy paths, boundary values, and invalid input error scenarios. This approach ensures your functions handle unexpected scenarios safely and prevents future regressions across your codebase.

How do I generate E2E tests for full workflows using Playwright?▼

Generating E2E tests with Playwright involves defining full user workflows from start to finish. You validate expected behavior across frontend components and backend API endpoints by mocking external dependencies rather than calling real APIs.

Can I use Testing Library to test frontend component interactions in Vitest?▼

Yes, you can use Testing Library with Vitest to validate frontend component interactions. This combination allows you to test user interactions, edge-case inputs, and visual regressions by focusing on component behavior rather than internal implementation details.

What is the best way to mock external dependencies like Supabase in integration testing?▼

The best way to mock external dependencies in integration testing is to intercept API calls and simulate responses. This practice keeps tests focused, avoids hitting real APIs, and ensures reliable validation of backend functions and endpoints.

Does automated testing work for validating both UI components and backend functions?▼

Yes, automated testing works for validating both UI components and backend functions. You apply unit tests to backend logic and component interaction tests to UI elements, ensuring complete coverage of expected behavior and error handling across the stack.

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