vitest-skill

name	vitest-skill
description	Generates Vitest tests in JavaScript/TypeScript with Vite-native speed. Jest-compatible API with ESM support and HMR. Use when user mentions "Vitest", "vi.mock", "vitest.config". Triggers on: "Vitest", "vi.mock", "vi.fn", "Vite test", "vitest config".
risk	unknown
source	https://github.com/LambdaTest/agent-skills/tree/main/vitest-skill
source_repo	LambdaTest/agent-skills
source_type	community
date_added	2026-07-01T00:00:00.000Z
license	MIT
license_source	https://github.com/LambdaTest/agent-skills/blob/main/LICENSE

Vitest Testing Skill

When to Use

Use this skill when you need generates Vitest tests in JavaScript/TypeScript with Vite-native speed. Jest-compatible API with ESM support and HMR. Use when user mentions "Vitest", "vi.mock", "vitest.config". Triggers on: "Vitest", "vi.mock", "vi.fn", "Vite test", "vitest config".

Core Patterns

Basic Test

import { describe, it, expect, vi, beforeEach } from 'vitest';
import { Calculator } from './calculator';

describe('Calculator', () => {
  let calc: Calculator;
  beforeEach(() => { calc = new Calculator(); });

  it('adds two numbers', () => {
    expect(calc.add(2, 3)).toBe(5);
  });

  it('throws on divide by zero', () => {
    expect(() => calc.divide(10, 0)).toThrow();
  });
});

Mocking (vi instead of jest)

import { vi } from 'vitest';

// Mock module
vi.mock('./database', () => ({
  getUser: vi.().({ :  }),
  : vi.().(),
}));


 mockFn = vi.();
mockFn.();
mockFn.({ :  });


 spy = vi.(, ).( {});
(spy).();
spy.();


vi.();
vi.();
vi.();
vi.();