diff --git a/InvenTree/company/fixtures/company.yaml b/InvenTree/company/fixtures/company.yaml
index 7f95b6ec26..e83d886812 100644
--- a/InvenTree/company/fixtures/company.yaml
+++ b/InvenTree/company/fixtures/company.yaml
@@ -1,14 +1,17 @@
 # Sample company data
 
 - model: company.company
+  pk: 1
   fields:
     name: ACME
     description: A Cool Military Enterprise
 - model: company.company
+  pk: 2
   fields:
     name: Appel Computers
     description: Think more differenter
 - model: company.company
+  pk: 3
   fields:
     name: Zerg Corp
     description: We eat the competition
\ No newline at end of file
diff --git a/InvenTree/order/__init__.py b/InvenTree/order/__init__.py
index e69de29bb2..c7ef040fb8 100644
--- a/InvenTree/order/__init__.py
+++ b/InvenTree/order/__init__.py
@@ -0,0 +1,3 @@
+"""
+The Order module is responsible for managing Orders
+"""
\ No newline at end of file
diff --git a/InvenTree/order/fixtures/order.yaml b/InvenTree/order/fixtures/order.yaml
new file mode 100644
index 0000000000..bbf2c47a74
--- /dev/null
+++ b/InvenTree/order/fixtures/order.yaml
@@ -0,0 +1,43 @@
+# PurchaseOrder and PurchaseOrderLineItem objects for testing
+
+# Ordering some screws from ACME
+- model: order.purchaseorder
+  pk: 1
+  fields:
+    reference: 0001
+    description: "Ordering some screws"
+    supplier: 1
+
+# Ordering some screws from Zerg Corp
+- model: order.purchaseorder
+  pk: 2
+  fields:
+    reference: 0002
+    description: "Ordering some more screws"
+    supplier: 3
+
+# Add some line items against PO 0001
+
+# 100 x ACME0001 (M2x4 LPHS)
+- model: order.purchaseorderlineitem
+  fields:
+    order: 1
+    part: 1
+    quantity: 100
+
+# 250 x ACME0002 (M2x4 LPHS)
+# Partially received (50)
+- model: order.purchaseorderlineitem
+  fields:
+    order: 1
+    part: 2
+    quantity: 250
+    received: 50
+
+# 100 x ZERGLPHS (M2x4 LPHS)
+- model: order.purchaseorderlineitem
+  fields:
+    order: 2
+    part: 3
+    quantity: 100
+    
diff --git a/InvenTree/order/tests.py b/InvenTree/order/tests.py
index ce215e567d..116b10e89d 100644
--- a/InvenTree/order/tests.py
+++ b/InvenTree/order/tests.py
@@ -1 +1,33 @@
-# TODO - Implement tests for the order app
+from django.test import TestCase
+
+from part.models import Part
+
+class OrderTest(TestCase):
+    """
+    Tests to ensure that the order models are functioning correctly.
+    """
+
+    fixtures = [
+        'company',
+        'supplier_part',
+        'category',
+        'part',
+        'location',
+        'stock',
+        'order'
+    ]
+
+    def test_on_order(self):
+        """ There should be 3 separate items on order for the M2x4 LPHS part """
+
+        part = Part.objects.get(name='M2x4 LPHS')
+
+        open_orders = []
+
+        for supplier in part.supplier_parts.all():
+            open_orders += supplier.open_orders()
+
+        self.assertEqual(len(open_orders), 3)
+
+        # Test the total on-order quantity
+        self.assertEqual(part.on_order, 400)