public virtual void Initialize()
 {
     if (Cold)
     {
         _sandbox   = new ColdStartSandbox();
         _testClass = _sandbox.CreateInstance <ColdStartEnabledTests>();
     }
     else
     {
         _testClass = new ColdStartEnabledTests();
     }
 }
        public virtual void Initialize()
        {
            if (Cold)
            {
#if NET461
                _sandbox   = new ColdStartSandbox();
                _testClass = _sandbox.CreateInstance <T>();
#endif
            }
            else
            {
                _testClass = new T();
            }
        }