public void TestBuyItem()
        {
            _repo.BuyItem(new PurchaseHistory()
            {
                Id              = "TID09",
                ItemId          = "I002",
                BuyerId         = "B001",
                SellerId        = "S001",
                NumberOfItems   = "1",
                DateTime        = DateTime.Now,
                Remarks         = "Nothing",
                TransactionType = "Debit"
            });
            var result = _repo.GetPurchaseHistory("TID09");

            Assert.IsNotNull(result);
        }