vitest
Vitest configuration, mocking, coverage, snapshot testing, and performance.
npx skills add a5c-ai/babysitter --skill vitest --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Vitest Skill Expert assistance for unit and integration testing with Vitest. ## Capabilities - Configure Vitest for projects - Write unit and integration tests - Implement mocking strategies - Configure coverage reporting - Optimize test performance ## Test Patterns ```typescript import { describe, it, expect, vi, beforeEach } from 'vitest'; import { render, screen } from '@testing-library/react'; import { UserService } from './user.service'; describe('UserService', () => { const mockDb = { user: { findMany: vi.fn() } }; beforeEach(() => { vi.clearAllMocks(); }); it('should fetch users', async () => { mockDb.user.findMany.mockResolvedValue([{ id: '1', name: 'John' }]); const service = new UserService(mockDb); const users = await service.findAll(); expect(users).toHaveLength(1); expect(mockDb.user.findMany).toHaveBeenCalledOnce(); }); }); ``` ## Configuration ```typescript // vitest.config.ts export default defineConfig({ test: { globals: true, environment: 'jsdom', coverage: { provider: 'v8', reporter: ['text', 'html'], }, }, }); ``` ## Target Processes - unit-testing - react-testing - tdd-development
- Capabilities
- Test Patterns
- Configuration
- Target Processes
What does the vitest skill do?
Vitest configuration, mocking, coverage, snapshot testing, and performance.
How do I install it?
Run `npx skills add a5c-ai/babysitter --skill vitest --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From a5c-ai/babysitter, a repository with 1,642 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.