Don't expect anything about 404 responseText

dart/tests/html/xhr_test.dart

Index: dart/tests/html/xhr_test.dart
diff --git a/dart/tests/html/xhr_test.dart b/dart/tests/html/xhr_test.dart
index d4755291ae82dad5b31252e73b2afb1d816c52f1..5759222e52866304686dbffa41b1454e8b171b91 100644
--- a/dart/tests/html/xhr_test.dart
+++ b/dart/tests/html/xhr_test.dart
@@ -28,7 +28,10 @@ main() {
 
   void validate404(xhr) {
     expect(xhr.status, equals(404));
-    expect(xhr.responseText, equals(''));
+    // We cannot say much about xhr.responseText, most HTTP servers will

[Emily Fortuna, 2014/05/27 15:55:35]

Don't we know that the response text is always '' since we're using our own dart
test server, though?

[ahe, 2014/05/27 15:59:10]

One might think that, but I just changed it to include a message. Mostly to work
around https://bugzilla.mozilla.org/show_bug.cgi?id=1016313.

+    // include an HTML page explaining the error to a human.
+    String responseText = xhr.responseText;
+    expect(responseText, isNotNull);
   }
 
   group('supported_onProgress', () {