landmine.cs

public async Task<OrderViewModel> Handle(GetOrderDetails request, CancellationToken cancellationToken)
{
    var order = await _orderRepository.GetByIdAsync(request.OrderId, cancellationToken);

    if (order == null)
    {
        throw new Exception("This is a land mine.");
    }

    return new OrderViewModel
    {
        OrderDate = order.OrderDate,
        OrderItems = order.OrderItems.Select(oi => new OrderItemViewModel
        {
            PictureUrl = oi.ItemOrdered.PictureUri,
            ProductId = oi.ItemOrdered.CatalogItemId,
            ProductName = oi.ItemOrdered.ProductName,
            UnitPrice = oi.UnitPrice,
            Units = oi.Units
        }).ToList(),
        OrderNumber = order.Id,
        ShippingAddress = order.ShipToAddress,
        Total = order.Total()
    };
}