/// <summary>
/// Builds a new house in the yard
/// </summary>
/// <returns>The newly-built house</returns>
public House BuildHouse()
{
if (HouseIsInYard())
{
throw new BuildingCodeException("You can't build a second house in this yard.");
}
House house = new House();
Transfer(house).To(this);
return house;
}
/// <summary>
/// Allows a wandering dog to wander into a particular house
/// </summary>
/// <param name="house">The house into which the dog will wander</param>
public void WanderInto(House house)
{
CheckMovementRules();
house.Transfer(this).To(house);
}