Bug 1312948: Regression test. r=nbp

MozReview-Commit-ID: 3r4nNCflwYw
Signed-off-by: Emilio Cobos Álvarez <ecoal95@gmail.com>

js/src/tests/ecma_5/Array/frozen-dict-mode-length.js

@@ -0,0 +1,18 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ * Author: Emilio Cobos Álvarez <ecoal95@gmail.com>
+ */
+var BUGNUMBER = 1312948;
+var summary = "Freezing a dictionary mode object with a length property should make Object.isFrozen report true";
+
+print(BUGNUMBER + ": " + summary);
+
+/* Convert to dictionary mode */
+delete Array.prototype.slice;
+
+Object.freeze(Array.prototype);
+assertEq(Object.isFrozen(Array.prototype), true);
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);