Testing

The Cloudflare Workers Vitest integration is the recommended way to test your applications, and allows for unit testing individual functions within your Worker or Pages Function.

However, if you don't use Vitest, both Miniflare's API and the unstable_startWorker() API provide options for testing your Worker in any testing framework.

Get started with Vitest

Testing comparison matrix

Feature	Vitest integration	unstable_startWorker()	Miniflare's API
Unit testing	✅	❌	❌
Integration testing	✅	✅	✅
Loading Wrangler configuration files	✅	✅	❌
Use bindings directly in tests	✅	❌	✅
Isolated per-test storage	✅	❌	❌
Outbound request mocking	✅	❌	✅
Multiple Worker support	✅	✅	✅
Direct access to Durable Objects	✅	❌	❌
Run Durable Object alarms immediately	✅	❌	❌
List Durable Objects	✅	❌	❌
Testing service Workers	❌	✅	✅