1 files changed, 17 insertions, 0 deletions
diff --git a/dom/base/test/test_window_proto.html b/dom/base/test/test_window_proto.html
new file mode 100644
index 000000000..944f953bc
--- /dev/null
+++ b/dom/base/test/test_window_proto.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test for ...</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+test(function() {
+  assert_throws(new TypeError, function() {
+    Object.setPrototypeOf(window, Object.create(window));
+  }, "Setting prototype via setPrototypeOf");
+
+  assert_throws(new TypeError, function() {
+    window.__proto__ = Object.create(window);
+  }, "Setting prototype via __proto__");
+}, "Setting the prototype of a window to something that has the window on its proto chain should throw");
+</script>