test: add test for manual incoming handler component

Signed-off-by: Victor Adossi <vadossi@cosmonic.com>

Author: vados-cosmonic

test/cases/http-server/source.js

@@ -0,0 +1,27 @@
+import {
+  IncomingRequest,
+  ResponseOutparam,
+  OutgoingBody,
+  OutgoingResponse,
+  Fields,
+} from 'wasi:http/types@0.2.3';
+
+export const incomingHandler = {
+  handle(incomingRequest, responseOutparam) {
+    const outgoingResponse = new OutgoingResponse(new Fields());
+    let outgoingBody = outgoingResponse.body();
+    {
+      let outputStream = outgoingBody.write();
+      outputStream.blockingWriteAndFlush(
+        new Uint8Array(new TextEncoder().encode('Hello world!')),
+      );
+      outputStream[Symbol.dispose]();
+    }
+    outgoingResponse.setStatusCode(200);
+    OutgoingBody.finish(outgoingBody, undefined);
+    ResponseOutparam.set(outgoingResponse, {
+      tag: 'ok',
+      val: outgoingResponse,
+    });
+  },
+};

test/cases/http-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'];
+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();
+  }
+}

test/util.js

@@ -0,0 +1,13 @@
+import { createServer } from 'node:net';
+
+// Utility function for getting a random port
+export async function getRandomPort() {
+  return await new Promise((resolve) => {
+    const server = createServer();
+    server.listen(0, function () {
+      const port = this.address().port;
+      server.on('close', () => resolve(port));
+      server.close();
+    });
+  });
+}

test/wit/test1.wit

@@ -64,3 +64,10 @@ world test2 {
 
   export get-result: func() -> string;
 }
+
+world test3 {
+  import wasi:cli/environment@0.2.3;
+  import wasi:http/types@0.2.3;
+
+  export wasi:http/incoming-handler@0.2.3;
+}