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);
}