diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/String/15.5.4.7.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/String/15.5.4.7.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+var BUGNUMBER = 612838;
+var summary = "String.prototype.indexOf with empty searchString";
+
+print(BUGNUMBER + ": " + summary);
+
+assertEq("123".indexOf("", -1), 0);
+assertEq("123".indexOf("", 0), 0);
+assertEq("123".indexOf("", 1), 1);
+assertEq("123".indexOf("", 3), 3);
+assertEq("123".indexOf("", 4), 3);
+assertEq("123".indexOf("", 12345), 3);
+
+reportCompare(true, true);
+
+print("All tests passed!");