C# 控制台项目 - NUnit 检查验证消息

Question

我有这个工作方法，我想为它编写 NUnit 测试用例方法。这是一个控制台项目，这意味着错误消息将通过 Console.WriteLine 方法打印，我在 Utility class 中使用 PrintMessage 方法来执行此操作。第二个参数是用布尔值控制Console.Color（红色表示错误信息）。

public void PlaceDeposit(BankAccount account, decimal _transaction_amt)
    {   
        if (_transaction_amt <= 0)
            Utility.PrintMessage("Amount needs to be more than zero. Try again.", false);
        else if (_transaction_amt % 10 != 0)
            Utility.PrintMessage($"Key in the deposit amount only with multiply of 10. Try again.", false);
        else if (!PreviewBankNotesCount(_transaction_amt))
            Utility.PrintMessage($"You have cancelled your action.", false);
        else
        {
            // Bind transaction_amt to Transaction object
            // Add transaction record - Start
            var transaction = new Transaction()
            {
                AccountID = account.Id,
                BankAccountNoTo = account.AccountNumber,
                TransactionType = TransactionType.Deposit,
                TransactionAmount = _transaction_amt,
                TransactionDate = DateTime.Now
            };

            repoTransaction.InsertTransaction(transaction);
            // Add transaction record - End


            account.Balance = account.Balance + _transaction_amt;


            ctx.SaveChanges();

            Utility.PrintMessage($"You have successfully deposited {Utility.FormatAmount(_transaction_amt)}", true);
        }
    }

我创建了另一个 NUnit 测试项目来测试上面的方法，但我遇到了断言。我应该将上述方法修改为 return 字符串（方法输出消息）以创建 NUnit 测试用例，还是应该着手更改我的原始方法？

[TestFixture]
public class TestATMCustomer
{
    [TestCase]
    public void PlaceDeposit()
    {
        // Arrange
        BankAccount bankAccount = new BankAccount() {
              FullName = "John", AccountNumber=333111, CardNumber = 123, PinCode = 111111, Balance = 2300.00m, isLocked = false                 
        };

        decimal transactionAmount = 120;

        var atmCustomer = new MeybankATM();

        // Act

        // Act and Assert
        Assert.AreEqual(atmCustomer.PlaceDeposit(bankAccount, transactionAmount));
    }
}

已更新测试用例，但 MeybankATM 构造函数中存在错误

    // Arrange - Start
        var mock = new MockMessagePrinter();

        MeybankATM atmCustomer = new MeybankATM(new RepoBankAccount(), new RepoTransaction(), mock);


        BankAccount bankAccount = new BankAccount()
        {
            FullName = "John",
            AccountNumber = 333111,
            CardNumber = 123,
            PinCode = 111111,
            Balance = 2000.00m,
            isLocked = false
        };

        decimal transactionAmount = 0;

        // Arrange - End

        // Act
        atmCustomer.PlaceDeposit(bankAccount, transactionAmount);

        // Assert            
        var expectedMessage = "Amount needs to be more than zero. Try again.";
        Assert.AreEqual(expectedMessage, mock.Message);

Answer 1

class Program
{
    static void Main(string[] args)
    {
        var mock = new MockMessagePrinter();
        ATMCustomer atmCustomer = new ATMCustomer(mock, new RepoTransaction());
        atmCustomer.PlaceDeposit(new BankAccount(), 0);
        Console.WriteLine(mock.Message == "Amount needs to be more than zero. Try again.");
        Console.ReadLine();
    }
}

public class ATMCustomer
{
    private readonly IMessagePrinter _msgPrinter;
    private readonly IRepoTransaction _repoTransaction;

    public ATMCustomer(IMessagePrinter msgPrinter, IRepoTransaction repoTransaction)
    {
        _msgPrinter = msgPrinter;
        _repoTransaction = repoTransaction;
    }
    public void PlaceDeposit(BankAccount account, decimal _transaction_amt)
    {
        if (_transaction_amt <= 0)
            _msgPrinter.PrintMessage("Amount needs to be more than zero. Try again.", false);
        else if (_transaction_amt % 10 != 0)
            _msgPrinter.PrintMessage($"Key in the deposit amount only with multiply of 10. Try again.", false);
        else if (!PreviewBankNotesCount(_transaction_amt))
            _msgPrinter.PrintMessage($"You have cancelled your action.", false);
        else
        {
            // Bind transaction_amt to Transaction object
            // Add transaction record - Start
            var transaction = new Transaction()
            {
                AccountID = account.Id,
                BankAccountNoTo = account.AccountNumber,
                TransactionType = TransactionType.Deposit,
                TransactionAmount = _transaction_amt,
                TransactionDate = DateTime.Now
            };

            _repoTransaction.InsertTransaction(transaction);
            // Add transaction record - End


            account.Balance = account.Balance + _transaction_amt;


            //ctx.SaveChanges();

            //_msgPrinter.PrintMessage($"You have successfully deposited {Utility.FormatAmount(_transaction_amt)}", true);
        }
    }

    private bool PreviewBankNotesCount(decimal transactionAmt)
    {
        throw new NotImplementedException();
    }
}

public class MockMessagePrinter : IMessagePrinter
{
    private string _message;

    public string Message => _message;

    public void PrintMessage(string message, bool idontKnow)
    {
        _message = message;
    }
}

public interface IRepoTransaction
{
    void InsertTransaction(Transaction transaction);
}

public class RepoTransaction : IRepoTransaction
{
    public void InsertTransaction(Transaction transaction)
    {
        throw new NotImplementedException();
    }
}

public interface IMessagePrinter
{
    void PrintMessage(string message, bool iDontKnow);
}

public class BankAccount
{
    public decimal Balance { get; set; }
    public string AccountNumber { get; set; }
    public int Id { get; set; }
}

public class Transaction
{
    public int AccountID { get; set; }
    public string BankAccountNoTo { get; set; }
    public TransactionType TransactionType { get; set; }
    public decimal TransactionAmount { get; set; }
    public DateTime TransactionDate { get; set; }
}

public enum TransactionType
{
    Deposit
}

我已经复制了你的代码并修改了一些：

我重构了您的代码以使用 IMessagePrinter 而不是 Utility，这样我就可以注入一个模拟对象来检查传递给 PrintMessage 方法的内容
我没有使用 NUnit - 我只是使用控制台项目作为示例
我假设使用了数据类型/类，但这并不重要

希望对您有所帮助

为 NUnit 编辑：

public class TestAtmCustomer
{
    [Test]
    public void Should_ShowZeroErrorMessage_OnPlaceDeposit_When_AmountIsZero()
    {
        var mock = new MockMessagePrinter();
        ATMCustomer atmCustomer = new ATMCustomer(mock, new RepoTransaction());
        atmCustomer.PlaceDeposit(new BankAccount(), 0);

        var expectedMessage = "Amount needs to be more than zero. Try again.";
        Assert.AreEqual(expectedMessage, mock.Message);
    }
}

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