Issue #3593 - Make isolate a fully internal member of the engine

test/AppInfoJsObject.cpp

 /*
  * 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
  * 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/>.
  */
 
 #include <AdblockPlus.h>
 #include <gtest/gtest.h>
 
 TEST(AppInfoJsObjectTest, AllProperties)
 {
   AdblockPlus::AppInfo appInfo;
   appInfo.version = "1";
   appInfo.name = "3";
   appInfo.application = "4";
   appInfo.applicationVersion = "5";
   appInfo.locale = "2";
   appInfo.developmentBuild = true;
-  AdblockPlus::JsEnginePtr jsEngine(AdblockPlus::JsEngine::New(appInfo));
+  auto jsEngine = AdblockPlus::JsEngine::New(appInfo);
   ASSERT_EQ("1", jsEngine->Evaluate("_appInfo.version")->AsString());
   ASSERT_EQ("3", jsEngine->Evaluate("_appInfo.name")->AsString());
   ASSERT_EQ("4", jsEngine->Evaluate("_appInfo.application")->AsString());
   ASSERT_EQ("5", jsEngine->Evaluate("_appInfo.applicationVersion")->AsString());
   ASSERT_EQ("2", jsEngine->Evaluate("_appInfo.locale")->AsString());
   ASSERT_TRUE(jsEngine->Evaluate("_appInfo.developmentBuild")->AsBool());
+  ASSERT_EQ(1, jsEngine.use_count());
+  jsEngine.reset();
 }
 
 TEST(AppInfoJsObjectTest, DefaultPropertyValues)
 {
   AdblockPlus::AppInfo appInfo;
-  AdblockPlus::JsEnginePtr jsEngine(AdblockPlus::JsEngine::New(appInfo));
+  auto jsEngine = AdblockPlus::JsEngine::New(appInfo);
   ASSERT_EQ("", jsEngine->Evaluate("_appInfo.version")->AsString());
   ASSERT_EQ("", jsEngine->Evaluate("_appInfo.name")->AsString());
   ASSERT_EQ("", jsEngine->Evaluate("_appInfo.application")->AsString());
   ASSERT_EQ("", jsEngine->Evaluate("_appInfo.applicationVersion")->AsString());
   ASSERT_EQ("", jsEngine->Evaluate("_appInfo.locale")->AsString());
   ASSERT_FALSE(jsEngine->Evaluate("_appInfo.developmentBuild")->AsBool());
+  ASSERT_EQ(1, jsEngine.use_count());
+  jsEngine.reset();
 }