public void PotionsShouldAddHitPoints()
 {
     var playerCharacter = new PlayerCharacter();
     var currentHitPoints = playerCharacter.HitPoints;
     const int potion = 5;
     playerCharacter.TakePotion(potion).ShouldBe(currentHitPoints + potion);
     playerCharacter.HitPoints.ShouldBe(currentHitPoints + potion);
 }