1 files changed, 30 insertions, 0 deletions
diff --git a/js/src/tests/non262/object/preventExtensions-idempotent.js b/js/src/tests/non262/object/preventExtensions-idempotent.js
new file mode 100644
index 0000000000..c0b16d890f
--- /dev/null
+++ b/js/src/tests/non262/object/preventExtensions-idempotent.js
@@ -0,0 +1,30 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Contributor:
+ *   Jeff Walden <jwalden+code@mit.edu>
+ */
+
+var gTestfile = 'preventExtensions-idempotent.js';
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 599459;
+var summary = 'Object.preventExtensions should be idempotent';
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+var obj = {};
+assertEq(Object.preventExtensions(obj), obj);
+assertEq(Object.isExtensible(obj), false);
+assertEq(Object.preventExtensions(obj), obj);
+assertEq(Object.isExtensible(obj), false);
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("All tests passed!");