diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/strict/15.5.5.1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/strict/15.5.5.1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+function str() {
+  return new String("foo");
+}
+
+assertEq(testLenientAndStrict('var s = str(); s.length = 1; s.length',
+                              returns(3), raisesException(TypeError)),
+         true);
+assertEq(testLenientAndStrict('var s = str(); delete s.length',
+                              returns(false), raisesException(TypeError)),
+         true);
+
+assertEq(testLenientAndStrict('"foo".length = 1',
+                              returns(1), raisesException(TypeError)),
+         true);
+assertEq(testLenientAndStrict('delete "foo".length',
+                              returns(false), raisesException(TypeError)),
+         true);
+
+reportCompare(true, true);