public async Task Update_SumChangedAndAccountChangedAndCategoryChanged_TypeOfFlowId2()
        {
            var oldItem = new PayingItem()
            {
                Summ = 500, AccountID = 1, Account = new Account()
                {
                    Cash = 1000
                }, CategoryID = 1
            };
            var newItem = new PayingItem()
            {
                Summ     = 600,
                Category = new Category()
                {
                    TypeOfFlowID = 2
                },
                Account = new Account()
                {
                    Cash = 1000
                },
                AccountID  = 2,
                CategoryID = 2
            };
            var newAccount = newItem.Account;
            var oldAccount = oldItem.Account;
            var target     = new PayingItemServiceTrigger(null, _accountService.Object);

            _accountService.Setup(x => x.GetItemAsync(newItem.AccountID)).ReturnsAsync(newAccount);
            _accountService.Setup(x => x.GetItemAsync(oldItem.AccountID)).ReturnsAsync(oldAccount);

            await target.Update(oldItem, newItem);

            Assert.AreEqual(oldAccount.Cash, 1500);
            Assert.AreEqual(newAccount.Cash, 400);
        }
        public async Task Update_NewSummGreaterThanOldSumm_TypeOfFlowId2()
        {
            var oldItem = new PayingItem()
            {
                Summ = 500
            };
            var newItem = new PayingItem()
            {
                Summ     = 600,
                Category = new Category()
                {
                    TypeOfFlowID = 2
                },
                Account = new Account()
                {
                    Cash = 500
                }
            };
            var account = newItem.Account;
            var target  = new PayingItemServiceTrigger(null, _accountService.Object);

            _accountService.Setup(x => x.GetItemAsync(It.IsAny <int>())).ReturnsAsync(account);

            await target.Update(oldItem, newItem);

            Assert.AreEqual(account.Cash, 400);
        }