Added the ability to get purchase orders as pdf

CoreTests/Integration/Pdf/Get.cs

@@ -20,6 +20,12 @@ public void can_get_credit_note_as_pdf()
             AssertOk(PdfEndpointType.CreditNotes, new CreditNotes.Create().Given_a_creditnote().Id);
         }
 
+        [Test]
+        public void can_get_purchase_order_as_pdf()
+        {
+            AssertOk(PdfEndpointType.PurchaseOrders, new PurchaseOrders.Create().Given_a_purchase_order().Id);
+        }
+
         [Test]
         public void invoice_gives_404_when_not_found()
         {
@@ -32,6 +38,12 @@ public void credit_note_gives_404_when_not_found()
             Assert.Throws<NotFoundException>(() => Api.PdfFiles.Get(PdfEndpointType.CreditNotes, Guid.NewGuid()));
         }
 
+        [Test]
+        public void purchase_order_gives_404_when_not_found()
+        {
+            Assert.Throws<NotFoundException>(() => Api.PdfFiles.Get(PdfEndpointType.PurchaseOrders, Guid.NewGuid()));
+        }
+
         private void AssertOk(PdfEndpointType type, Guid id)
         {
             var pdf = Api.PdfFiles.Get(type, id);

CoreTests/Integration/PurchaseOrders/Create.cs

@@ -58,5 +58,27 @@ private Guid ContactId
                 return Api.Contacts.Find().First().Id;
             }
         }
+
+        public PurchaseOrder Given_a_purchase_order()
+        {
+            return Api.PurchaseOrders.Create(
+                new PurchaseOrder
+                {
+                    Status = PurchaseOrderStatus.Authorised,
+                    Date = DateTime.Today,
+                    Contact = new Contact { Id = ContactId },
+                    LineItems = new List<LineItem>()
+                    {
+                        new LineItem
+                        {
+                            Description = "An item I want to purchase",
+                            UnitAmount = 1,
+                            Quantity = 1,
+
+                        }
+                    }
+                }
+            );
+        }
     }
 }

Xero.Api/Core/Model/Types/PdfEndpointType.cs

@@ -3,6 +3,7 @@
     public enum PdfEndpointType
     {
         CreditNotes,
-        Invoices        
+        Invoices,
+        PurchaseOrders
     }
 }