diff -r 000000000000 -r 6474c204b198 layout/tools/layout-debug/tests/unit/test_componentsRegistered.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/tools/layout-debug/tests/unit/test_componentsRegistered.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+function run_test() {
+    do_check_true("@mozilla.org/layout-debug/regressiontester;1" in
+		  Components.classes);
+    do_check_true("@mozilla.org/layout-debug/layout-debuggingtools;1" in
+		  Components.classes);
+    do_check_true("@mozilla.org/commandlinehandler/general-startup;1?type=layoutdebug" in
+		  Components.classes);    
+}
\ No newline at end of file