# Workers - Run integration tests against your Worker's production build

Publisher-attributed story with a reviewed brief or permitted publisher paragraph. The original publisher is responsible for the linked reporting.

- Publisher: Cloudflare Developers
- Category: Cloud
- Original publication time: 2026-07-27T00:00:00Z
- First observed by NexusTechWire: 2026-10-01T15:54:33Z
- Original source: https://developers.cloudflare.com/changelog/post/2026-07-21-integration-test-harness/
- NexusTechWire record: https://nexustechwire.com/news/news-46a6c4018d502dba4a6c

## From the publisher

Wrangler now provides createTestHarness(), an API for running integration tests against Workers built with Wrangler or the Cloudflare Vite plugin from any Node.js test runner. The test harness starts a local Worker server with helpers for dispatching requests, resetting storage, and inspecting runtime logs.

Source license: [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/). Publisher excerpt shortened and converted to plain text. Original source license applies.

Read the full original: [Cloudflare Developers](https://developers.cloudflare.com/changelog/post/2026-07-21-integration-test-harness/)

This record does not reproduce the complete article or represent independent confirmation of every source claim.