public void can_save_order()
{
var purchaseOrder = new PurchaseOrder
{
Date = DateTime.Now,
Number = "N1"
};
modifyOrderModel.Persist(purchaseOrder);
Assert.That(purchaseOrder, Is.Not.Null);
Assert.That(purchaseOrder.Id > 0);
}
void view_SaveButtonPressed(object sender, EventArgs e)
{
currentOrder.ClearLines();
currentOrder.AddLines(View.OrderLines);
modifyOrderModel.Persist(currentOrder);
}