Fixes #1 -- add webhook tests + mock

Author: FPurchess

tests/__init__.py

@@ -0,0 +1,20 @@
+FAKE_ALERT_TEST_SUBSCRIPTION_CREATED = {
+    "alert_id": 1,
+    "alert_name": "subscription_created",
+    "cancel_url": "https://checkout.paddle.com/subscription/cancel?user=1&subscription=2&hash=aaaaaa",
+    "update_url": "https://checkout.paddle.com/subscription/update?user=5&subscription=4&hash=aaaaaa",
+    "checkout_id": 1,
+    "currency": "EUR",
+    "email": "gardner.wuckert@example.org",
+    "event_time": "2020-01-13 19:19:18",
+    "marketing_consent": 1,
+    "next_bill_date": "2020-01-30",
+    "passthrough": "",
+    "quantity": 1,
+    "source": "",
+    "status": "active",
+    "subscription_id": 1,
+    "subscription_plan_id": 1,
+    "unit_price": 0,
+    "user_id": 1,
+}

tests/test_webhooks.py

@@ -0,0 +1,28 @@
+from copy import deepcopy
+from unittest import mock
+
+from django.urls import reverse
+from django.test import TestCase, Client
+
+from . import FAKE_ALERT_TEST_SUBSCRIPTION_CREATED
+
+
+class TestWebhook(TestCase):
+    def _send_alert(self, data):
+        return Client().post(reverse("djpaddle:webhook"), data)
+
+    @mock.patch("djpaddle.views.is_valid_webhook", return_value=True)
+    def test_webhook_is_valid_alert(self, is_valid_webhook):
+        valid_alert = deepcopy(FAKE_ALERT_TEST_SUBSCRIPTION_CREATED)
+        valid_alert["p_signature"] = "valid-signature"
+
+        resp = self._send_alert(valid_alert)
+        self.assertTrue(is_valid_webhook.called)
+        self.assertEqual(resp.status_code, 200)
+
+    def test_webhook_is_invalid_signature(self):
+        invalid_alert = deepcopy(FAKE_ALERT_TEST_SUBSCRIPTION_CREATED)
+        invalid_alert["p_signature"] = "invalid-signature"
+
+        resp = self._send_alert(invalid_alert)
+        self.assertEqual(resp.status_code, 400)