diff -r 000000000000 -r 6474c204b198 browser/components/customizableui/test/browser_992747_toggle_noncustomizable_toolbar.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/customizableui/test/browser_992747_toggle_noncustomizable_toolbar.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const TOOLBARID = "test-noncustomizable-toolbar-for-toggling";
+function test() {
+  let tb = document.createElementNS(kNSXUL, "toolbar");
+  tb.id = TOOLBARID;
+  gNavToolbox.appendChild(tb);
+  try {
+    CustomizableUI.setToolbarVisibility(TOOLBARID, false);
+  } catch (ex) {
+    ok(false, "Should not throw exceptions trying to set toolbar visibility.");
+  }
+  is(tb.getAttribute("collapsed"), "true", "Toolbar should be collapsed");
+  try {
+    CustomizableUI.setToolbarVisibility(TOOLBARID, true);
+  } catch (ex) {
+    ok(false, "Should not throw exceptions trying to set toolbar visibility.");
+  }
+  is(tb.getAttribute("collapsed"), "false", "Toolbar should be uncollapsed");
+  tb.remove();
+};
+