Adding ease-of-use methods to HttpRequest.

tests/html/xhr_test.dart

 // Copyright (c) 2012, 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 XHRTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:html';
 import 'dart:json' as json;
 
+void fail(message) {
+  guardAsync(() {
+    expect(false, isTrue, reason: message);
+  });
+}
+
 main() {
   useHtmlIndividualConfiguration();
   var url = "/tests/html/xhr_cross_origin_data.txt";
 
   void validate200Response(xhr) {
     expect(xhr.status, equals(200));
     var data = json.parse(xhr.response);
     expect(data, contains('feed'));
     expect(data['feed'], contains('entry'));
     expect(data, isMap);
@@ skipping 59 matching lines @@
       }));
     });
 
     test('XHR.getWithCredentials file', () {
       new HttpRequest.getWithCredentials(url, expectAsync1((xhr) {
         expect(xhr.readyState, equals(HttpRequest.DONE));
         validate200Response(xhr);
       }));
     });
 
+    test('XHR.getString file', () {
+      HttpRequest.getString(url).then(expectAsync1((str) {}));
+    });
+
+    test('XHR.getString No file', () {
+      HttpRequest.getString('NonExistingFile').then(
+        (_) { fail('Succeeded for non-existing file.'); },
+        onError: expectAsync1((e) {
+          validate404(e.error.target);
+        }));
+    });
+
+    test('XHR.request', () {
+      if (ArrayBuffer.supported) {
+        HttpRequest.request(url, responseType: 'ArrayBuffer').then(
+          expectAsync1((xhr) {
+            validate200Response(xhr);
+            var arrayBuffer = xhr.response;
+            expect(arrayBuffer, new isInstanceOf<ArrayBuffer>());
+            expect(arrayBuffer, isNotNull);
+          }));
+      }
+    });
+
     test('HttpRequestProgressEvent', () {
       var expectation = HttpRequestProgressEvent.supported ?
           returnsNormally : throws;
       expect(() {
         var event = new Event.eventType('XMLHttpRequestProgressEvent', '');
         expect(event is HttpRequestProgressEvent, isTrue);
       }, expectation);
     });
   });
 }