Vitest Fundamentals: Tests, Matchers & Setup. Vitest is a fast, Vite-native testing framework for JavaScript/TypeScript. It offers a Jest-compatible API while reusing Vite's build pipeline (esbuild) for near-instant test…
ReadVitest Advanced: Mocking, Timers & Test Isolation. Mocking Functions & Modules. import { vi, test, expect } from 'vitest' // vi.fn() -- a trackable stand-in function const mockCallback = vi.fn() mockCallback('hello') exp…
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