Fixed WASM runtime v2

Author: seifibrahim32

pkgs/http/test/html/cache_test.dart

@@ -10,15 +10,22 @@ import 'dart:async';
 import 'package:http/browser_client.dart';
 import 'package:http/http.dart' as http;
 import 'package:http/http.dart';
+import 'package:stream_channel/stream_channel.dart';
 import 'package:test/test.dart';
 
 import 'utils.dart';
 
+extension on StreamChannel<dynamic> {
+  /// Handles the Wasm case where the runtime type is actually [double] instead
+  /// of the JS case where its [int].
+  Future<int> get firstAsInt async => ((await stream.first) as num).toInt();
+}
+
 void main() {
   late Uri url;
   setUp(() async {
     final channel = spawnHybridUri(Uri(path: '/test/stub_server.dart'));
-    var port = await (channel.stream.first as num).toInt();
+    var port = await channel.firstAsInt;
     url = echoUrl.replace(port: port);
   });