backend-vitest

Configure Vitest for TypeScript and JavaScript unit tests.

13|2|Updated Aug 9, 2025
One-click install
npx skills add https://github.com/petbrains/mvp-builder --skill backend-vitest
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: backend-vitest
Source: https://github.com/petbrains/mvp-builder/tree/main/.claude/skills/backend-vitest
Command: npx skills add https://github.com/petbrains/mvp-builder --skill backend-vitest

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill eliminates slow, cumbersome testing setups by providing a Vite-powered testing framework that's 10-20x faster than Jest, with zero-config TypeScript support and Jest-compatible API for tRPC procedures, Zod schemas, and utilities.

Core Features & Use Cases

  • Zero-Config TypeScript: Native ESM support with automatic path alias resolution.
  • tRPC Testing: Mock context factories and complete testing patterns for tRPC routers and procedures.
  • Use Case: Imagine testing a user management API with tRPC. This Skill provides mock Prisma clients, authentication context simulation, and complete test patterns for success/error cases—making test writing faster and execution instantaneous.

Quick Start

Use the backend-vitest skill to set up testing for a tRPC user router with tests for create, read, update, and delete operations using mocked database calls.

Frequently Asked Questions about backend-vitest

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

FAQPage Schema
How do I set up fast unit testing for a TypeScript backend?

Unit testing for TypeScript backends uses Vitest, a Vite-powered framework 10-20x faster than Jest with zero-config TypeScript support, native ESM, and Jest-compatible API. It runs instantly in watch mode and integrates seamlessly with tRPC, Zod schemas, and utilities.

Can I test tRPC procedures with mocked database calls?

Yes. Vitest provides mock context factories and complete test patterns for tRPC routers and procedures, including mocked Prisma clients and authentication context simulation, enabling fast CRUD operation testing without database calls.

Does Vitest support TypeScript without configuration?

Vitest offers zero-config TypeScript support with native ESM, automatic path alias resolution, and instant watch mode. It requires no setup for TypeScript projects and maintains Jest-compatible API for existing test patterns.

What's the best way to test Zod schemas and utilities in TypeScript?

Vitest's Jest-compatible API and configurable mocks enable straightforward testing of Zod schemas and utility functions. Combined with zero-config TypeScript and instant feedback in watch mode, it accelerates validation and unit test coverage.

How do I configure code coverage and mocks in Vitest?

Vitest configuration supports customizable coverage reporting and mock setup. Define coverage thresholds and mock strategies in vitest.config.ts to track test completeness across tRPC procedures, Zod schemas, and React components.

Can I use Vitest for React component testing in a Vite project?

Yes. Vitest integrates with Vite-based workflows to test React components alongside backend code. Its Jest-compatible API and configurable coverage work for both component and utility testing in a single test suite.