Add test for splitted config files

src/common/config/pastDefaultPreferences.js

@@ -1,10 +1,11 @@
 const defaultPreferences = require('./defaultPreferences');
 
 const pastDefaultPreferences = {
-  1: defaultPreferences,
   0: {
     url: ''
   }
 };
 
+pastDefaultPreferences[`${defaultPreferences.version}`] = defaultPreferences;
+
 module.exports = pastDefaultPreferences;