Adding test for XHR responseType 'blob'

tests/html/xhr_test.dart

Index: tests/html/xhr_test.dart
diff --git a/tests/html/xhr_test.dart b/tests/html/xhr_test.dart
index ed3bd83f8f8c9badddce1473596b1cb75c9bb3d8..8276b49962f0e7ce900614b93a54561a414b4cca 100644
--- a/tests/html/xhr_test.dart
+++ b/tests/html/xhr_test.dart
@@ -142,7 +142,7 @@ main() {
         }));
     });
 
-    test('XHR.request responseType', () {
+    test('XHR.request responseType arraybuffer', () {
       if (ArrayBuffer.supported) {
         HttpRequest.request(url, responseType: 'arraybuffer').then(
           expectAsync1((xhr) {
@@ -154,6 +154,18 @@ main() {
       }
     });
 
+    test('XHR.request responseType blob', () {
+      if (ArrayBuffer.supported) {
+        return HttpRequest.request(url, responseType: 'blob').then(
+          (xhr) {
+            expect(xhr.status, equals(200));
+            var blob = xhr.response;
+            expect(blob is Blob, isTrue);
+            expect(blob, isNotNull);

[Anton Muhin, 2013/03/14 10:05:01]

I think isNotNull check either go first, or be dropped altogether.

+          });
+      }
+    });
+
     test('HttpRequestProgressEvent', () {
       var expectation = HttpRequestProgressEvent.supported ?
           returnsNormally : throws;