Add an initial test

tests/mappings/test_order.py

@@ -1,8 +1,24 @@
 from django.test import TestCase
 from oscar.core.loading import get_model
 
+from oscar_odin.mappings import order
+
 Order = get_model("order", "Order")
 
 
 class TestOrder(TestCase):
-    pass
+    fixtures = [
+        "oscar_odin/auth",
+        "oscar_odin/catalogue",
+        "oscar_odin/partner",
+        "oscar_odin/offer",
+        "oscar_odin/address",
+        "oscar_odin/order",
+    ]
+
+    def test_mapping__basic_model_to_resource(self):
+        order_model = Order.objects.first()
+
+        actual = order.order_to_resource(order_model)
+
+        self.assertEqual(order_model.number, actual.number)