tdd-vitest-typescript

Guide Test-Driven Development workflows with Vitest and TypeScript.

1|Updated Nov 26, 2025
One-click install
npx skills add https://github.com/Emz1998/nexly-notes --skill tdd-vitest-typescript
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: tdd-vitest-typescript
Source: https://github.com/Emz1998/nexly-notes/tree/main/archive/tdd
Command: npx skills add https://github.com/Emz1998/nexly-notes --skill tdd-vitest-typescript

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill guides developers through Test-Driven Development (TDD) workflows, ensuring robust, well-tested code from the start. It simplifies the process of writing tests before code, following the Red-Green-Refactor cycle, and setting up Vitest with TypeScript for type-safe, reliable applications.

Core Features & Use Cases

  • TDD Workflow Guidance: Systematically applies the Red-Green-Refactor cycle for new features and bug fixes.
  • Vitest & TypeScript Setup: Provides configurations, file organization, and patterns for type-safe testing environments.
  • Advanced Testing Patterns: Covers mocking, asynchronous code testing, error handling, and integration testing strategies.
  • Use Case: When starting a new feature, use this skill to write a failing test, then implement the minimal code to pass it, and finally refactor, ensuring every piece of code is covered by tests and adheres to TDD principles.

Quick Start

Help me set up a new Vitest and TypeScript project for TDD, including example calculator.ts and calculator.test.ts files.

Frequently Asked Questions about tdd-vitest-typescript

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

FAQPage Schema
How do I start writing tests before code using the Red-Green-Refactor cycle?

The Red-Green-Refactor cycle is TDD's core pattern: write a failing test (red), implement minimal code to pass it (green), then refactor for quality. This Skill guides you through each phase systematically, helping you apply the cycle to new features and bug fixes in TypeScript projects.

How do I set up Vitest with TypeScript for test-driven development?

Set up Vitest with TypeScript by configuring vitest.config.ts, tsconfig.json, and organizing test files alongside source code. This Skill provides ready-to-use configurations, file structure patterns, and example test scaffolds to establish a type-safe testing environment immediately.

Can I use Vitest for both unit and integration testing?

Yes, Vitest handles both unit and integration testing in TypeScript projects. This Skill covers patterns for mocking, asynchronous code, error handling, and integration strategies, so you can apply TDD principles across different test scopes.

What's the best way to structure tests and source code for TDD in TypeScript?

Co-locate test files with source code using consistent naming (calculator.ts and calculator.test.ts). This Skill provides file organization patterns, test scaffolding templates, and workflow descriptions that enforce TDD discipline while keeping code and tests together for maintainability.

How do I test asynchronous code and handle mocking in Vitest?

Vitest provides built-in mocking and async/await support for TypeScript. This Skill covers advanced patterns for testing promises, async functions, mocked dependencies, and error scenarios, enabling comprehensive test coverage within TDD workflows.