Add resource tests.

tests/corelib/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;
+}