fix: add cron test client and case

codeforlife/tests/__init__.py

@@ -0,0 +1 @@
+from .cron import CronTestCase, CronTestClient

codeforlife/tests/cron.py

@@ -0,0 +1,28 @@
+from rest_framework.test import APIClient, APITestCase
+
+
+class CronTestClient(APIClient):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs, HTTP_X_APPENGINE_CRON="true")
+
+    def generic(
+        self,
+        method,
+        path,
+        data="",
+        content_type="application/octet-stream",
+        secure=False,
+        **extra,
+    ):
+        wsgi_response = super().generic(
+            method, path, data, content_type, secure, **extra
+        )
+        assert (
+            200 <= wsgi_response.status_code < 300
+        ), f"Response has error status code: {wsgi_response.status_code}"
+
+        return wsgi_response
+
+
+class CronTestCase(APITestCase):
+    client_class = CronTestClient