Issue #3593, #1197- fix isolate management

test/BaseJsTest.h

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 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 120 matching lines @@
 
 class LazyLogSystem : public AdblockPlus::LogSystem
 {
 public:
   void operator()(LogLevel logLevel, const std::string& message,
           const std::string& source)
   {
   }
 };
 
+AdblockPlus::JsEnginePtr createJsEngine(const AdblockPlus::AppInfo& appInfo = AdblockPlus::AppInfo());
+
 class BaseJsTest : public ::testing::Test
 {
 protected:
   AdblockPlus::JsEnginePtr jsEngine;
 
   virtual void SetUp()
   {
-    jsEngine = AdblockPlus::JsEngine::New();
+    jsEngine = createJsEngine();
     jsEngine->SetLogSystem(AdblockPlus::LogSystemPtr(new ThrowingLogSystem));
     jsEngine->SetFileSystem(AdblockPlus::FileSystemPtr(new ThrowingFileSystem));
     jsEngine->SetWebRequest(AdblockPlus::WebRequestPtr(new ThrowingWebRequest));
   }
 };
 
+
 #endif