diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_5/strict/strict-this-is-not-truthy.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_5/strict/strict-this-is-not-truthy.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+// See bug 630543.
+
+function f() {
+    "use strict";
+    return !this;
+}
+assertEq(f.call(null), true);
+
+reportCompare(0, 0, 'ok');