Migrate test block 9 to Dart 2.0

tests/corelib_strong/http_resource_test.dart

-// Copyright (c) 2015, 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";
-
-const sampleText = "Sample text file.";
-
-main() async {
-  var server = await startServer();
-  var uriText = "http://localhost:${server.port}/sample.txt?query#fragment";
-  var resource = new Resource(uriText);
-
-  if (resource.uri != Uri.parse(uriText)) {
-    throw "Incorrect URI: ${resource.uri}";
-  }
-
-  var text = await resource.readAsString();
-  if (text != sampleText) {
-    throw "Incorrect reading of text file: $text";
-  }
-
-  var bytes = await resource.readAsBytes();
-  if (!compareBytes(bytes, sampleText.codeUnits)) {
-    throw "Incorrect reading of bytes: $bytes";
-  }
-
-  var streamBytes = [];
-  await for (var byteSlice in resource.openRead()) {
-    streamBytes.addAll(byteSlice);
-  }
-  if (!compareBytes(streamBytes, sampleText.codeUnits)) {
-    throw "Incorrect reading of bytes: $bytes";
-  }
-
-  await server.close();
-}
-
-/// Checks that [bytes] and [expectedBytes] have the same contents.
-bool compareBytes(bytes, expectedBytes) {
-  if (bytes.length != expectedBytes.length) return false;
-  for (int i = 0; i < expectedBytes.length; i++) {
-    if (bytes[i] != expectedBytes[i]) return false;
-  }
-  return true;
-}
-
-startServer() async {
-  var server = await HttpServer.bind(InternetAddress.LOOPBACK_IP_V4, 0);
-  var expectedUri = new Uri(path: "/sample.txt", query: "query");
-  server.forEach((request) async {
-    await request.drain();
-    var response = request.response;
-    if (request.uri == expectedUri) {
-      response.write(sampleText);
-    } else {
-      response.write("INCORRECT PATH!: ${request.uri}");
-    }
-    response.close();
-  });
-  return server;
-}