test: add test case for fetch-event integration

Author: vados-cosmonic

test/cases/fetch-event-server/source.js

@@ -0,0 +1,7 @@
+addEventListener("fetch", (event) =>
+  event.respondWith(
+    (async () => {
+      return new Response("Hello World");
+    })(),
+  ),
+);

test/cases/fetch-event-server/test.js

@@ -0,0 +1,22 @@
+import { strictEqual } from 'node:assert';
+
+import { HTTPServer } from '@bytecodealliance/preview2-shim/http';
+
+import { getRandomPort } from '../../util.js';
+
+export const enableFeatures = ['http', 'fetch-event'];
+export const worldName = 'test3';
+
+export async function test(instance) {
+  const server = new HTTPServer(instance.incomingHandler);
+  let port = await getRandomPort();
+  server.listen(port);
+
+  try {
+    const resp = await fetch(`http://localhost:${port}`);
+    const text = await resp.text();
+    strictEqual(text, 'Hello world!');
+  } finally {
+    server.stop();
+  }
+}