public void Give_error_when_second_time_added_same_product()
{
var mock = new Mock <IManagerDal>();
mock.Setup(t => t.IsExist(It.IsAny <Expression <Func <int, bool> > >())).Returns(true);
MoqManager moqManager = new MoqManager(mock.Object);
moqManager.Add(It.IsAny <int>());
}
