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";
+  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";
+  }
+  if (!compareBytes(streamBytes, bytes)) {

[Søren Gjesse, 2015/08/07 13:51:16]

ditto.

+    throw "Inconsistent reading of bytes: $bytes / $streamBytes";
+  }
+
+  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);
+  server.forEach((request) async {
+    await request.drain();
+    var response = request.response;

[Ivan Posva, 2015/08/10 05:39:56]

Don't you want to verify that the request is made for the correct resource? The
way it is written currently it would not fail if the request was made to fetch a
file named "txt.elpmas".

[Lasse Reichstein Nielsen, 2015/08/10 10:40:09]

Good idea.

+    response.write(sampleText);
+    response.close();
+  });
+  return server;
+}