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Vitest integration

For most users, Cloudflare recommends using the Workers Vitest integration for testing Workers and Pages Functions projects. Vitest ↗ is a popular JavaScript testing framework featuring a very fast watch mode, Jest compatibility, and out-of-the-box support for TypeScript. In this integration, Cloudflare provides a custom pool that allows your Vitest tests to run inside the Workers runtime.

The Workers Vitest integration:

Supports both unit tests and integration tests.
Provides direct access to Workers runtime APIs and bindings.
Implements isolated per-test-file storage.
Runs tests fully-locally using Miniflare ↗.
Leverages Vitest's hot-module reloading for near instant reruns.
Supports projects with multiple Workers.

Write your first test