public async Task AddItem_Single_Conflict()
        {
            var filePath    = UTHelpers.Up();
            var ds          = new DataStore(filePath);
            var apiSettings = Options.Create(new ApiSettings());

            var controller = new DynamicController(ds, apiSettings);

            var item = new { value = "hello" };

            var result = await controller.AddNewItem("configuration", JToken.FromObject(item));

            Assert.IsType <ConflictResult>(result);

            UTHelpers.Down(filePath);
        }