Cross frame access tests

client/tests/client/dom/CrossFrameTest.dart

Index: client/tests/client/dom/CrossFrameTest.dart
diff --git a/client/tests/client/dom/CrossFrameTest.dart b/client/tests/client/dom/CrossFrameTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..ee5e99b1c2b94781d6306ba2dd8d4a71b2c4ae60
--- /dev/null
+++ b/client/tests/client/dom/CrossFrameTest.dart
@@ -0,0 +1,27 @@
+#library('CrossFrameTest');
+#import('../../../testing/unittest/unittest.dart');
+#import('dart:dom');
+
+main() {
+  forLayoutTests();
+
+  test('contentWindow', () {
+      final iframe = document.createElement('iframe');
+      document.body.appendChild(iframe);
+      final frameWindow = iframe.contentWindow;
+
+      // Test this field to ensure a valid Dart wrapper.
+      Expect.isNull(frameWindow.dartObjectLocalStorage);
+
+      // Ensure that the frame's document is inaccessible via window.
+      Expect.throws(() => frameWindow.document);
+    });
+
+  test('contentDocument', () {
+      final iframe = document.createElement('iframe');
+      document.body.appendChild(iframe);
+
+      // Ensure that the frame's document is inaccessible.
+      Expect.throws(() => iframe.contentDocument);
+    });
+}