public void AddAccount()
        {
            BankTeller teller       = new BankTeller(db);
            string     customerName = "Test Account";

            // Add Account
            int accountNumber = teller.AddAccount(customerName);

            // Verify
            Assert.True(accountNumber > -1);

            // Remove Account as part of clean-up
            teller.RemoveAccount(customerName);
            accountNumber = teller.GetAccountNumber(customerName);
            Assert.Equal(-1, accountNumber);
        }