public void FieldAsAReference()
        {
            var feet = new FeetHolder();

            feet.NumberOfFeet = 4;
            var mutantDog = new ActualDog(feet);

            feet.NumberOfFeet = 5;

            Assert.AreEqual(5, mutantDog.Feet.NumberOfFeet);
        }
 public ActualDog(FeetHolder feet) : base(feet)
 {
 }
 public Dog(FeetHolder feet)
 {
     Feet = feet;
 }