Testing

The Workers platform has a variety of ways to test your applications, depending on your requirements. We recommend using the Vitest integration, which allows for unit testing individual functions within your Worker. 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.

Write your first test

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	❌	✅	✅

Pages Functions

The content described on this page is also applicable to Pages Functions. Pages Functions are Cloudflare Workers and can be thought of synonymously with Workers in this context.