Add test_create_application_credit() function

Author: Paulinakhew

test/application_credit_test.py

@@ -1,15 +1,39 @@
 import shopify
+import json
 from test.test_helper import TestCase
 from pyactiveresource.activeresource import ActiveResource
 
 class ApplicationCreditTest(TestCase):
     def test_get_application_credit(self):
-        self.fake("application_credits/445365009", method='GET', body=self.load_fixture('application_credit'))
+        self.fake('application_credits/445365009', method='GET', body=self.load_fixture('application_credit'), code=200)
         application_credit = shopify.ApplicationCredit.find(445365009)
         self.assertEqual('5.00', application_credit.amount)
 
     def test_get_all_application_credits(self):
-        self.fake("application_credits", method='GET', body=self.load_fixture('application_credits'))
+        self.fake('application_credits', method='GET', body=self.load_fixture('application_credits'), code=200)
         application_credits = shopify.ApplicationCredit.find()
         self.assertEqual(1, len(application_credits))
         self.assertEqual(445365009, application_credits[0].id)
+
+    def test_create_application_credit(self):
+        self.fake(
+            'application_credits',
+            method='POST',
+            body=self.load_fixture('application_credit'),
+            headers={'Content-type': 'application/json'},
+            code=201
+        )
+
+        application_credit = shopify.ApplicationCredit.create({
+            'description': 'application credit for refund',
+            'amount': 5.0
+        })
+
+        expected_body = {
+            "application_credit": {
+                "description": "application credit for refund",
+                "amount": 5.0
+            }
+        }
+
+        self.assertEqual(expected_body, json.loads(self.http.request.data.decode("utf-8")))