1 files changed, 31 insertions, 0 deletions
diff --git a/js/xpconnect/tests/unit/test_deepFreezeClone.js b/js/xpconnect/tests/unit/test_deepFreezeClone.js
new file mode 100644
index 0000000000..949b85f551
--- /dev/null
+++ b/js/xpconnect/tests/unit/test_deepFreezeClone.js
@@ -0,0 +1,31 @@
+function checkThrows(f, rgxp) { try { f(); do_check_false(); } catch (e) { Assert.ok(rgxp.test(e)); } }
+
+var o = { foo: 42, bar : { tick: 'tock' } };
+function checkClone(clone, frozen) {
+  var waived = Cu.waiveXrays(clone);
+  function touchFoo() { "use strict"; waived.foo = 12; Assert.equal(waived.foo, 12); }
+  function touchBar() { "use strict"; waived.bar.tick = 'tack'; Assert.equal(waived.bar.tick, 'tack'); }
+  function addProp() { "use strict"; waived.newProp = 100; Assert.equal(waived.newProp, 100); }
+  if (!frozen) {
+    touchFoo();
+    touchBar();
+    addProp();
+  } else {
+    checkThrows(touchFoo, /read-only/);
+    checkThrows(touchBar, /read-only/);
+    checkThrows(addProp, /extensible/);
+  }
+
+  var desc = Object.getOwnPropertyDescriptor(waived, 'foo');
+  Assert.equal(desc.writable, !frozen);
+  Assert.equal(desc.configurable, !frozen);
+  desc = Object.getOwnPropertyDescriptor(waived.bar, 'tick');
+  Assert.equal(desc.writable, !frozen);
+  Assert.equal(desc.configurable, !frozen);
+}
+
+function run_test() {
+  var sb = new Cu.Sandbox(null);
+  checkClone(Cu.waiveXrays(Cu.cloneInto(o, sb)), false);
+  checkClone(Cu.cloneInto(o, sb, { deepFreeze: true }), true);
+}