diff -r 000000000000 -r 6474c204b198 ipc/testshell/tests/test_ipcshell.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/testshell/tests/test_ipcshell.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,28 @@
+function callback(result) {
+  do_check_eq(result, Ci.nsIXULRuntime.PROCESS_TYPE_CONTENT);
+  do_test_finished();
+}
+
+function run_test() {
+  do_test_pending();
+
+  do_check_eq(runtime.processType, Ci.nsIXULRuntime.PROCESS_TYPE_DEFAULT);
+
+  sendCommand("load('test_ipcshell_child.js');");
+
+  sendCommand("runtime.processType;", callback);
+
+  [ [ "C", "D" ], [ "D", "C" ], [ "\u010C", "D" ], [ "D", "\u010C" ] ].forEach(
+    function (pair) {
+      do_test_pending();
+      var cmp = pair[0].localeCompare(pair[1]);
+      sendCommand(
+          "'"+ pair[0] +"'.localeCompare('"+ pair[1] +"');",
+          function (result) {
+              do_check_eq(cmp, result);
+              do_test_finished(); 
+          });
+    })
+}
+load('test_ipcshell_child.js');
+