Updated testrunner:

utils/tests/testrunner/http_client_tests/http_client_test.dart

+// Copyright (c) 2013, 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.
+
+library testrunner_test;
+
+import 'dart:async';
+import 'dart:io';
+import 'dart:uri';
+import 'package:unittest/unittest.dart';
+
+main() {
+  var get = (String what, int code, String text) {
+    var c = new Completer();
+    HttpClient client = new HttpClient();
+    client.getUrl(new Uri.fromString("http://127.0.0.1:3456/$what"))
+    .then((HttpClientRequest request) {
+      // Prepare the request then call close on it to send it.
+      return request.close();
+    })
+    .then((HttpClientResponse response) {
+      // Process the response.
+      expect(response.statusCode, code);
+      var sb = new StringBuffer();
+      response.transform(new StringDecoder())
+       .listen((data) {
+         sb.write(data);
+      }, onDone: () {
+        expect(sb.toString(), text);
+        c.complete();
+      });
+    });
+    return c.future;
+  };
+  test('test1', () {
+    return get('test.txt', 200, "Hello world!\n");
+  });
+  test('test2', () {
+    return get('fail.txt', 404, "");
+  });
+}
+