public void BalanceShouldReturn100WhenBankAccountIdIs1()
        {
            // Arrange
            var logic = new BDD_Demo_Lib.BankAccountLogic(_context);

            // Act
            decimal balance = logic.GetBalance(1);

            // Assert
            balance.Should().Be(100);
        }
        public void BalanceShouldReturnExceptionWhenBankAccountIdNotFound()
        {
            // Arrange
            var logic = new BDD_Demo_Lib.BankAccountLogic(_context);

            // Act
            Action act = () => logic.GetBalance(4);

            // Assert
            act.Should().Throw <System.NullReferenceException>();
        }