React
React Router v7 uses Vite as its default build tool, which makes Vitest the natural testing choice — it reuses the same Vite config, understands import.meta.env natively, and runs 10–40x faster than Jest on Vite-based projects. This guide covers the full Vitest setup for a React Router
Testing
Vitest runs tests in parallel using worker processes. How those workers are created — and how isolated they are from each other — determines your test suite's speed, stability, and compatibility with native modules. Vitest offers three pool types: threads, forks, and vmThreads. Knowing which to use can cut your
Testing
Vitest's built-in reporters — verbose, dot, tap, junit — cover most cases. But sometimes you need test output in a custom format: a Slack message shaped exactly how your team wants it, a JSON file that feeds your internal dashboard, or a compact CI format that highlights only failures.
Testing
Module Federation was originally a Webpack 5 feature, but @originjs/vite-plugin-federation brought it to the Vite ecosystem. Testing Vite-based federated modules requires a different setup than Webpack — Vitest is the natural testing tool, and the module resolution strategy for federated imports needs specific configuration. This guide covers
Testing
The Vue 3 Composition API changed how we write Vue components — and it changed how we test them. Composables can be tested in isolation, reactive state is explicit and predictable, and <script setup> components are simpler to reason about. But the patterns for testing them effectively aren'
Testing
Pinia is the official state management library for Vue 3, and testing Pinia stores is straightforward once you understand the setup requirements. Unlike Vuex, Pinia stores are regular composables — you can import and call them directly in tests without complex mocking infrastructure. This guide covers testing Pinia stores in isolation,
Testing
Nuxt 3's auto-imports, composables, and server routes require a different testing approach than standard Vue 3. Vitest combined with @nuxt/test-utils provides first-class support for testing in the Nuxt runtime environment — giving you access to auto-imported functions, useNuxtApp(), and SSR utilities without elaborate mocking.
Monorepo
pnpm workspaces give you a fast, disk-efficient monorepo foundation, but the testing story requires deliberate setup. Out of the box, you can run pnpm --filter <package> test to execute tests in a specific package, but that's only the beginning. The real value comes from shared