Issue #4826 - Use latch to replace thread-sleeping in tests

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
  * 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/>.
  */
 
 #ifndef MOCKS_H
 #define MOCKS_H
 
 #include <condition_variable>
 #include <mutex>
 #include <thread>
 
 #include <AdblockPlus.h>
+#include "../src/JsEngineInternal.h"
 #include <gtest/gtest.h>
 
 class ThrowingLogSystem : public AdblockPlus::LogSystem
 {
 public:
   void operator()(LogLevel logLevel, const std::string& message,
         const std::string& source)
   {
     throw std::runtime_error("Unexpected error: " + message);
   }
@@ skipping 138 matching lines @@
   {
   }
 };
 
 AdblockPlus::JsEnginePtr CreateJsEngine(const AdblockPlus::AppInfo& appInfo = AdblockPlus::AppInfo());
 
 class BaseJsTest : public ::testing::Test
 {
 protected:
   AdblockPlus::JsEnginePtr jsEngine;
+  JsEngineInternal* engine;
   virtual void SetUp();
   virtual void TearDown();
 };
 
 #endif