dart2js: fetch http Resources

tests/html/resource_http_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.
+
+library resource_http_test;
+import 'dart:convert';
+import 'package:unittest/html_individual_config.dart';
+import 'package:unittest/unittest.dart';
+
+main() {
+  useHtmlIndividualConfiguration();
+  // Cache blocker is a workaround for:
+  // https://code.google.com/p/dart/issues/detail?id=11834
+  var cacheBlocker = new DateTime.now().millisecondsSinceEpoch;
+  var url = '/root_dart/tests/html/xhr_cross_origin_data.txt?'

[Siggi Cherem (dart-lang), 2015/08/25 00:43:27]

let's use a new data file specific for this test, just to make it easier to
discover/maintain.

[Harry Terkelsen, 2015/08/25 17:45:06]

Done.

+      'cacheBlock=$cacheBlocker';
+
+  void validateResponse(d) {
+    var data = JSON.decode(d);

[Siggi Cherem (dart-lang), 2015/08/25 00:43:27]

then this could be a simple string equality check

[Harry Terkelsen, 2015/08/25 17:45:06]

Done.

+    expect(data, contains('feed'));
+    expect(data['feed'], contains('entry'));
+    expect(data, isMap);
+  }
+
+  group('resource', () {
+    test('readAsString', () {
+      Resource r = new Resource(url);
+      r.readAsString().then(expectAsync((s) {

[Siggi Cherem (dart-lang), 2015/08/25 00:43:27]

either use await or return the future to ensure we pause the test before moving
to the next one

[Harry Terkelsen, 2015/08/25 17:45:06]

Done.

+        validateResponse(s);
+      }));
+    });
+    test('readAsBytes', () {
+      Resource r = new Resource(url);
+      r.readAsBytes().then(expectAsync((b) {

[Siggi Cherem (dart-lang), 2015/08/25 00:43:27]

ditto

[Harry Terkelsen, 2015/08/25 17:45:06]

Done.

+        validateResponse(new String.fromCharCodes(b));
+      }));
+    });
+    test('openRead', () async {
+      Resource r = new Resource(url);
+      var bytes = [];
+      await for (var b in r.openRead()) {
+        bytes.addAll(b);
+      }
+      validateResponse(new String.fromCharCodes(bytes));
+    });
+  });
+}