1 files changed, 12 insertions, 0 deletions
diff --git a/js/xpconnect/tests/chrome/file_expandosharing.jsm b/js/xpconnect/tests/chrome/file_expandosharing.jsm
new file mode 100644
index 0000000000..f680ae20a9
--- /dev/null
+++ b/js/xpconnect/tests/chrome/file_expandosharing.jsm
@@ -0,0 +1,12 @@
+var EXPORTED_SYMBOLS = ["checkFromJSM"];
+
+function checkFromJSM(target, is_op) {
+  is_op(target.numProp, 42, "Number expando works");
+  is_op(target.strProp, "foo", "String expando works");
+  // If is_op is todo_is, target.objProp will be undefined.
+  try {
+    is_op(target.objProp.bar, "baz", "Object expando works");
+  } catch (e) {
+    is_op(0, 1, "No object expando");
+  }
+}