public async Task IdOfNonExistentShipper_DeleteShipperOrder_ReturnNotFound()
        {
            const int shipperId = -1;
            const int orderId   = 4;

            var exception = await Assert.ThrowsAsync <ProblemDetailsException>(() =>
                                                                               _shipperController.DeleteShipperOrder(shipperId, orderId));

            Assert.Equal(StatusCodes.Status404NotFound, exception.Details.Status);
            Assert.Contains("shipper", exception.Details.Title, StringComparison.OrdinalIgnoreCase);
        }