Noissue - Fix icon error when running unit tests

lib/icon.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 39 matching lines @@
 
 function setIcon(page, notificationType, opacity, frames)
 {
   opacity = opacity || 0;
   let whitelisted = !!whitelistedState.get(page);
 
   if (!notificationType || !frames)
   {
     if (opacity > 0.5)
     {
-      page.browserAction.setIcon("icons/abp-$size-notification-" +
+      page.browserAction.setIcon("/icons/abp-$size-notification-" +
                                  notificationType + ".png");
     }
     else
     {
-      page.browserAction.setIcon("icons/abp-$size" +
+      page.browserAction.setIcon("/icons/abp-$size" +
                                  (whitelisted ? "-whitelisted" : "") + ".png");
     }
   }
   else
   {
     chrome.browserAction.setIcon({
       tabId: page.id,
       imageData: frames["" + opacity + whitelisted]
     });
   }
@@ skipping 152 matching lines @@
           clearInterval(interval);
           resolve();
           return;
         }
 
         animateIcon(type, frames);
       }, 10000);
     });
   });
 };