public async Task GetAll_Cats_Successful()
        {
            var entities = await CatController.GetAll();

            var enumerable = entities as Cat[] ?? entities.ToArray();

            enumerable.Count().Should().Be(Cats.Count);
        }
        public async Task GetAll_Cats_Successful()
        {
            var result = await CatController.GetAll() as OkObjectResult;

            var entities = result.Value as IEnumerable <Cat>;

            entities.Count().Should().Be(TestData.Cats.Count);
        }