public void GetElement_InputExistingId_SubscribeReturned()
        {
            int?SubscribeId = 2;
            var mock        = new Mock <IUnitOfWork>();

            mock.Setup(a => a.Subscribs.GetElement(SubscribeId.Value)).Returns(new Subscribe());
            var service = new SubscribeService(mock.Object);

            var result = service.GetElement(SubscribeId.Value) as SubscribeDTO;

            Assert.IsNotNull(result);
        }