Noissue - Remove unused variable in unit test

test/filterStorage_readwrite.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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 "use strict";
 
 const {createSandbox, unexpectedError} = require("./_common");
 
 let Filter = null;
 let FilterNotifier = null;
 let FilterStorage = null;
 let IO = null;
 let Prefs = null;
-let Subscription = null;
 let ExternalSubscription = null;
 let dataFile = null;
 
 exports.setUp = function(callback)
 {
   let sandboxedRequire = createSandbox();
   (
     {Filter} = sandboxedRequire("../lib/filterClasses"),
     {FilterNotifier} = sandboxedRequire("../lib/filterNotifier"),
     {FilterStorage} = sandboxedRequire("../lib/filterStorage"),
     {IO} = sandboxedRequire("./stub-modules/io"),
     {Prefs} = sandboxedRequire("./stub-modules/prefs"),
-    {Subscription, ExternalSubscription} = sandboxedRequire("../lib/subscriptionClasses")
+    {ExternalSubscription} = sandboxedRequire("../lib/subscriptionClasses")
   );
 
   Prefs.patternsfile = "patterns.ini";
   dataFile = IO.resolveFilePath(Prefs.patternsfile);
 
   FilterStorage.addFilter(Filter.fromText("foobar"));
   callback();
 };
 
 let testData = new Promise((resolve, reject) =>
@@ skipping 273 matching lines @@
     return FilterStorage.restoreBackup(1);
   }).then(() =>
   {
     test.equal(FilterStorage.subscriptions.length, 1, "Subscription count after restoring backup");
     return loadFilters();
   }).then(() =>
   {
     test.equal(FilterStorage.subscriptions.length, 1, "Subscription count after reloading");
   }).catch(unexpectedError.bind(test)).then(() => test.done());
 };