Mono + C# + NUnit

.gitignore

.DS_Store
*.dll
*.xml

bank-compiler.sh

#!/bin/sh

dmcs -t:library \
     -r:nunit.framework.dll \
     bank.cs \
     bank_test.cs

bank-test.sh

#!/bin/sh

nunit-console bank.dll

bank.cs

namespace bank
{
    using System;
    
    public class Account
    {
        private float balance;
        public void Deposit(float amount)
        {
            balance+=amount;
        }

        public void Withdraw(float amount)
        {
            balance-=amount;
        }

        public void TransferFunds(Account destination, float amount)
        {
            if (amount > balance)
            {
                throw new InvalidOperationException("Insufficient balance to transfer " + amount);
            }
    
            Withdraw(amount);
            destination.Deposit(amount);
        }

        public float Balance
        {
            get { return balance; }
        }
    }
}

bank_test.cs

namespace bank
{
    using System;
    using NUnit.Framework;

    [TestFixture]
    public class AccountTest
    {
        [Test]
        public void ShouldTransferFunds()
        {
            Account source = new Account();
            source.Deposit(200.00F);

            Account destination = new Account();
            destination.Deposit(150.00F);

            source.TransferFunds(destination, 100.00F);

            Assert.AreEqual(250.00F, destination.Balance, "Destination account should have 250.00");
            Assert.AreEqual(100.00F, source.Balance, "Source account should have 250.00");
        }

        [Test]
        public void ShouldTransferFundsOnlyWhenHaveBalance()
        {
            Account source = new Account();
            source.Deposit(200.00F);

            Account destination = new Account();
            destination.Deposit(150.00F);

            source.TransferFunds(destination, 100.00F);
            
            Assert.AreEqual(250.00F, destination.Balance, "Destination account should have 250.00");
            Assert.IsInstanceOfType(typeof(InvalidOperationException), Eval(() => source.TransferFunds(destination, 300.00F)),
                            "Source have a insufficient balance to transfer 300.00");
        }
        
        public delegate void ThrowsDelegate();
        
        private Exception Eval(ThrowsDelegate code)
        {
            try
            {
                code();
                return null;
            }
            catch (Exception e)
            {
                return e;
            }
        }
    }
}