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Vitest integration · Cloudflare Workers docs
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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 storage.
  • Runs tests fully-locally using Miniflare ↗.
  • Leverages Vitest's hot-module reloading for near instant reruns.
  • Provides a declarative interface for mocking outbound requests.
  • Supports projects with multiple Workers.

Write your first test