Tomemos ejemplos de dos métodos e intentemos crear pruebas unitarias para ellos.

gistfile1.txt

public interface IAccount  
    {  
        double CurrentBallance { get; }
        double Deposit(double amount);  
        double Withdraw(double amount);  
    }  
  
public class Account : IAccount  
    {  
        double _balance;  
        
        public double CurrentBallance { get { return _balance; } }
          
        public double Deposit(double amount)  
        {  
         if (amount > 0)
         {
            _balance += amount;  
            return _balance;  
         }  
        else
         {
            throw new ArgumentException("Invalid Deposit Amount!");
         }
        }
        public Double Withdraw(double amount)  
        {  
            if (amount > 0 && _balance >= amount)  
            {  
                _balance -= amount;  
            }  
            else  
            {  
                throw new ArgumentException("No balance to Withdraw!");  
            }  
  
            return _balance;  
         }