change integration-testing.mdx to unstable startworker

Author: emily-shen

src/content/docs/workers/testing/index.mdx

@@ -17,7 +17,6 @@ The Workers platform has a variety of ways to test your applications, depending
 
 However, if you don't use Vitest, both [Miniflare's API](/workers/testing/miniflare/writing-tests) and the [`unstable_startWorker()`](/workers/wrangler/api/#unstable_startworker) API provide options for testing your Worker in any testing framework.
 
-| Feature                                                                  | [Vitest integration](/workers/testing/vitest-integration) | [`unstable_startWorker()`](/workers/wrangler/api/#unstable_startworker) | [Miniflare's API](/workers/testing/miniflare) |
 | ------------------------------------------------------------------------ | --------------------------------------------------------- | ----------------------------------------------------------------------- | --------------------------------------------- |
 | Unit testing                                                             | ✅                                                        | ❌                                                                      | ❌                                            |
 | Integration testing                                                      | ✅                                                        | ✅                                                                      | ✅                                            |
@@ -30,5 +29,6 @@ However, if you don't use Vitest, both [Miniflare's API](/workers/testing/minif
 | Run Durable Object alarms immediately                                    | ✅                                                        | ❌                                                                      | ❌                                            |
 | List Durable Objects                                                     | ✅                                                        | ❌                                                                      | ❌                                            |
 | Testing service Workers                                                  | ❌                                                        | ✅                                                                      | ✅                                            |
+| Feature                                                                  | [Vitest integration](/workers/testing/vitest-integration) | [`unstable_startWorker()`](/workers/testing/unstable_startworker/) | [Miniflare's API](/workers/testing/miniflare/writing-tests/) |
 
 <Render file="testing-pages-functions" product="workers" />

src/content/docs/workers/testing/integration-testing.mdx

@@ -2,7 +2,7 @@
 title: Miniflare
 pcx_content_type: navigation
 sidebar:
-  order: 15
+  order: 16
 head:
   - tag: title
     content: miniflare

src/content/docs/workers/testing/miniflare/index.mdx

@@ -7,14 +7,14 @@ head: []
 description: Write integration tests against Workers using Miniflare.
 ---
 
-:::note
-For most users, Cloudflare recommends using the Workers Vitest integration for testing Workers and [Pages Functions](/pages/functions/) projects. [Vitest](https://vitest.dev/) is a popular JavaScript testing framework featuring a very fast watch mode, Jest compatibility, and out-of-the-box support for TypeScript.
-:::
-
 import { TabItem, Tabs, Details } from "~/components";
 
 import { FileTree } from "@astrojs/starlight/components";
 
+:::note
+For most users, Cloudflare recommends using the Workers Vitest integration. If you have been using test environments from Miniflare, refer to the [Migrate from Miniflare 2 guide](/workers/testing/vitest-integration/migration-guides/migrate-from-miniflare-2/).
+:::
+
 This guide will show you how to set up [Miniflare](/workers/testing/miniflare) to test your Workers. Miniflare is a low-level API that allows you to fully control how your Workers are run and tested.
 
 To use Miniflare, make sure you've installed the latest version of Miniflare v3:

src/content/docs/workers/testing/miniflare/writing-tests.mdx

@@ -0,0 +1,49 @@
+---
+title: Wrangler's unstable_startWorker()
+pcx_content_type: concept
+sidebar:
+  order: 17
+head: []
+description: Write integration tests using Wrangler's `unstable_startWorker()` API
+---
+
+import { Render } from "~/components";
+import { LinkButton } from "@astrojs/starlight/components";
+
+:::note
+For most users, Cloudflare recommends using the Workers Vitest integration. If you have been using `unstable_dev()`, refer to the [Migrate from `unstable_dev()` guide](/workers/testing/vitest-integration/migration-guides/migrate-from-unstable-dev/).
+:::
+
+:::caution
+`unstable_startWorker()` is an experimental API subject to breaking changes.
+:::
+
+If you do not want to use Vitest, consider using [Wrangler's `unstable_startWorker()` API](/workers/wrangler/api/#unstable_startworker). This API exposes the internals of Wrangler's dev server, and allows you to customise how it runs. Compared to using [Miniflare directly](/workers/testing/miniflare/writing-tests/) for testing, you can pass in a Wrangler configuration file, and it will automatically load the configuration for you.
+
+This example uses `node:test`, but should apply to any testing framework:
+
+    ```ts
+    import assert from "node:assert";
+    import test, { after, before, describe } from "node:test";
+    import { unstable_startWorker } from "wrangler";
+
+    describe("worker", () => {
+    	let worker;
+
+    	before(async () => {
+    		worker = await unstable_startWorker({ config: "wrangler.json" });
+    	});
+
+    	test("hello world", async () => {
+    		assert.strictEqual(
+    			await (await worker.fetch("http://example.com")).text(),
+    			"Hello world",
+    		);
+    	});
+
+    	after(async () => {
+    		await worker.dispose();
+    	});
+    });
+
+    ```