diff -r 000000000000 -r 6474c204b198 js/xpconnect/tests/unit/test_sandbox_atob.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/xpconnect/tests/unit/test_sandbox_atob.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+function run_test() {
+  var Cu = Components.utils;
+  sb = new Cu.Sandbox('http://www.example.com',
+                      { wantGlobalProperties: ["atob", "btoa"] });
+  sb.do_check_eq = do_check_eq;
+  Cu.evalInSandbox('var dummy = "Dummy test.";' +
+                   'do_check_eq(dummy, atob(btoa(dummy)));' +
+                   'do_check_eq(btoa("budapest"), "YnVkYXBlc3Q=");',
+                   sb);
+}