Add optional customer.orders() support with tests

Author: Paulinakhew

shopify/resources/customer.py

@@ -1,6 +1,7 @@
 from ..base import ShopifyResource
 from shopify import mixins
 from .customer_invite import CustomerInvite
+from .order import Order
 
 
 class Customer(ShopifyResource, mixins.Metafields):
@@ -24,3 +25,6 @@ def search(cls, **kwargs):
     def send_invite(self, customer_invite=CustomerInvite()):
         resource = self.post("send_invite", customer_invite.encode())
         return CustomerInvite(Customer.format.decode(resource.body))
+
+    def orders(self):
+        return Order.find(customer_id=self.id)

test/customer_test.py

@@ -53,3 +53,12 @@ def test_send_invite_with_params(self):
         self.assertEqual(customer_invite, json.loads(self.http.request.data.decode("utf-8")))
         self.assertIsInstance(customer_invite_response, shopify.CustomerInvite)
         self.assertEqual(customer_invite['customer_invite']['to'], customer_invite_response.to)
+
+    def test_get_customer_orders(self):
+        self.fake('customers/207119551', method='GET', body=self.load_fixture('customer'))
+        customer = shopify.Customer.find(207119551)
+        self.fake('customers/207119551/orders', method='GET', body=self.load_fixture('orders'))
+        orders = customer.orders()
+        self.assertIsInstance(orders[0], shopify.Order)
+        self.assertEqual(450789469, orders[0].id)
+        self.assertEqual(207119551, orders[0].customer.id)