public async Task SaveDataItem_LeftData_ShouldSave()
{
IActionResult result = await _controller.SaveDataItemAsync(TestConstants.DiffId, "left", TestConstants.DataItemRequestA);
await _diffService.Received().SaveDataItemAsync(TestConstants.DiffId, DiffItemSide.Left, TestConstants.DataItemRequestA.Data);
Assert.IsType <CreatedResult>(result);
}
