diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/Date/toISOString.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/Date/toISOString.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+function throwsRangeError(t) {
+    try {
+        var date = new Date();
+        date.setTime(t);
+        var r = date.toISOString();
+        throw new Error("toISOString didn't throw, instead returned " + r);
+    } catch (err) {
+        assertEq(err instanceof RangeError, true, 'wrong error: ' + err);
+        return;
+    }
+    assertEq(0, 1, 'not good, nyan, nyan');
+}
+
+throwsRangeError(Infinity);
+throwsRangeError(-Infinity);
+throwsRangeError(NaN);
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);