public void RemoveAnimal_ShelterEmpty()
        {
            var shelter = new ShelterRepository(1);
            Cat cat     = new Cat {
                Name = "cat", AgeInHumanYears = 2
            };

            shelter.RemoveAnimal(cat);
        }
        public void RemoveAnimal_AnimalEmpty()
        {
            var shelter = new ShelterRepository(1);
            Cat cat     = null;

            shelter.AddAnimal(cat);

            shelter.RemoveAnimal(cat);
        }
        public void RemoveAnimalTest()
        {
            var shelter = new ShelterRepository(1);
            Cat cat     = new Cat {
                Name = "cat", AgeInHumanYears = 2
            };
            Dog dog = new Dog {
                Name = "dog1", AgeInHumanYears = 2, Price = 22.99
            };

            shelter.AddAnimal(cat);
            shelter.RemoveAnimal(dog);
        }