Add some sweet XML classes.

client/tests/client/html/frog_DocumentFragmentTests.dart

Index: client/tests/client/html/frog_DocumentFragmentTests.dart
diff --git a/client/tests/client/html/frog_DocumentFragmentTests.dart b/client/tests/client/html/frog_DocumentFragmentTests.dart
new file mode 100644
index 0000000000000000000000000000000000000000..fa6c4bd1dd578d363fa3714597343dbd6f2d8ccc
--- /dev/null
+++ b/client/tests/client/html/frog_DocumentFragmentTests.dart
@@ -0,0 +1,12 @@
+// 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.
+
+testDocumentFragment() {
+  group('constructors', () {
+    test('.xml parses input as XML', () {
+      final fragment = new DocumentFragment.xml('<a>foo</a>');
+      Expect.isTrue(fragment.elements.first is XMLElement);
+    });
+  });
+}