Mars Rover - Implementing Rover Part 1

default.cs

default(Direction); // North
default(int); // 0
default(Coordinate); // null

ModifiedCoordinate.cs

public struct Coordinate
{
  public int X {get; set;}
  public int Y {get; set;}
}

ModifiedDirection.cs

public Direction
{
  South, North, East, West
}

RoverWithDefaultPart1.cs

public class Rover
{
  public Direction Orientation {get; set;}
  public Coordinate Location {get; set;}
  
  public Rover()
  {
    Orientation = Direction.North;
  }
}

RoverWithDefaultPart2.cs

public class Rover
{
  public Direction Orientation {get; set;}
  public Coordinate Location {get; set;}
  
  public Rover()
  {
    Orientation = Direction.North;
    Location = new Coordinate(){X=0, Y=0};
  }
}

Structs.cs

public struct Date
{
  public int Month {get; set;}
  public int Day {get; set;}
  public int Year {get; set;}
}

public class Order
{
  public Date TransactionDate {get; set;}
  public decimal Total {get; set;}
}

var order = new Order{Total=9.99m}; // at this point, Order will have a Date of 0/00/0000
order.TransactionDate = new Date{Month=6, Day=22, Year=2020}; // Order has a new date!
order.TransactionDate.Day = 23 // Fail to compile => Cannot modify the return value of `TransactionDate`
                                                  // because it is not a variable

WhenCreating.cs

using NUnit;

namespace MarsRover.UnitTests.RoverTests
{
  [TestFixture]
  public class WhenCreating
  {
    [Test]
    public void ThenTheRoverIsFacingNorth()
    {
      // Arrange and Act
      var rover = new Rover();
      
      // Assert
      Assert.AreEqual(Direction.North, rover.Orientation);
    }
    
    [Test]
    public void ThenTheRoverIsAt00()
    {
      // Arrange and Act
      var rover = new Rover();
      
      var expectedLocation = new Coordinate{X=0, Y=0};
      Assert.AreEqual(expectedLocation, rover.Location); 
    }
  }
}