[io/socket] Test of being able to read big chunks from a socket

Follow-up to https://dart-review.googlesource.com/c/sdk/+/369243 where
without that CL (i.e. after
https://dart-review.googlesource.com/c/sdk/+/369141 but before the fix)
the test will hang. With the CL the test finishes as it should.

Change-Id: I7b37be1c515a3666a8040d1790b55ff99b68a1be
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/369463
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>

tests/standalone/io/socket_big_chunk_test.dart

@@ -0,0 +1,43 @@
+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import "dart:io";
+import "dart:typed_data";
+
+import "package:async_helper/async_helper.dart";
+import "package:expect/expect.dart";
+
+Future<void> main() async {
+  asyncStart();
+
+  Uint8List data = new Uint8List(100 * 1024 * 1024);
+  final HttpServer server = await HttpServer.bind('127.0.0.1', 0);
+  print("Listening on 127.0.0.1:${server.port}");
+
+  server.listen((HttpRequest request) {
+    print("Handling request...");
+    final HttpResponse response = request.response;
+    response.add(data);
+    response.close();
+  });
+
+  HttpClient client = new HttpClient();
+  HttpClientRequest clientResult =
+      await client.get('127.0.0.1', server.port, 'foo');
+  HttpClientResponse response = await clientResult.close();
+  print("Client result closed");
+  int totalLength = 0;
+  await for (List<int> data in response) {
+    totalLength += data.length;
+    print("Got chunk of size ${data.length}. "
+        "Total received is now $totalLength.");
+  }
+  print("Client done.");
+  Expect.equals(data.length, totalLength);
+
+  client.close();
+  await server.close();
+
+  asyncEnd();
+}