From e20c2726df66e92f836a13dcb6af76b248dcd094 Mon Sep 17 00:00:00 2001
From: Robin Ward <robin.ward@gmail.com>
Date: Thu, 12 Nov 2015 10:15:06 -0500
Subject: [PATCH] FIX: Don't use mutationObserver in testing mode. Can hang
 Phantom

---
 app/assets/javascripts/discourse/components/menu-panel.js.es6 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/assets/javascripts/discourse/components/menu-panel.js.es6 b/app/assets/javascripts/discourse/components/menu-panel.js.es6
index d0dfee5970..c35a77923a 100644
--- a/app/assets/javascripts/discourse/components/menu-panel.js.es6
+++ b/app/assets/javascripts/discourse/components/menu-panel.js.es6
@@ -2,7 +2,7 @@ import { default as computed, on, observes } from 'ember-addons/ember-computed-d
 import { headerHeight } from 'discourse/views/header';
 
 const PANEL_BODY_MARGIN = 30;
-const mutationSupport = !!window['MutationObserver'];
+const mutationSupport = !Ember.testing && !!window['MutationObserver'];
 
 export default Ember.Component.extend({
   classNameBindings: [':menu-panel', 'visible::hidden', 'viewMode'],