Phoenix() private method

private Phoenix ( ) : Task
return Task
        public async Task Phoenix_action_should_display_all_phoenix_in_cache()
        {
            Global.Cache.PhoenixFireCage.Add("item1", Substitute.For<Phoenix>(Substitute.For<_IInvocation>(), new CacheItem { Data = "data", Key = "item1" }));
            Global.Cache.PhoenixFireCage.Add("item2", Substitute.For<Phoenix>(Substitute.For<_IInvocation>(), new CacheItem { Data = new MediaTypeHeaderValue("text/json"), Key = "item2" }));
            Global.Cache.PhoenixFireCage.Add("item5", Substitute.For<Phoenix>(Substitute.For<_IInvocation>(), new CacheItem()));
            Global.Cache.PhoenixFireCage.Add("item6", Substitute.For<Phoenix>(Substitute.For<_IInvocation>(), new CacheItem()));

            var syncStore = Substitute.For<ICacheStore>();
            syncStore.Get(Arg.Any<string>()).Returns(c => new CacheItem
            {
                Key = c.Arg<string>(),
                Data = "data"
            });

            var asyncStore = Substitute.For<IAsyncCacheStore>();
            asyncStore.GetAsync(Arg.Any<string>()).Returns(c =>
            {
                object obj = new WebApiCacheItem
                {
                    Key = c.Arg<string>(),
                    Content = new byte[0]
                };
                return Task.FromResult(obj);
            });

            var provider = Substitute.For<ICacheStoreProvider>();
            provider.GetCacheStore(Arg.Any<int>()).Returns(syncStore);
            provider.GetAsyncCacheStore(Arg.Any<int>()).Returns(asyncStore);
            var controller = new FlatwhiteStatusController(provider);

            // Action
            var result = await controller.Phoenix();
            var jsonResult = (JsonResult<List<FlatwhiteStatusController.CacheItemStatus>>)result;

            // Assert
            Assert.AreEqual(4, jsonResult.Content.Count);
        }