public async Task SaveDataItem_NumericDataSide_ShouldNotFind()
{
IActionResult result = await _controller.SaveDataItemAsync(TestConstants.DiffId, "1", TestConstants.DataItemRequestA);
await _diffService.DidNotReceiveWithAnyArgs().SaveDataItemAsync(Arg.Any <int>(), Arg.Any <DiffItemSide>(), Arg.Any <string>());
Assert.IsType <NotFoundResult>(result);
}