Zulip integration returns more detailed error messages

hc/api/tests/test_notify.py

@@ -826,3 +826,20 @@ class NotifyTestCase(BaseTestCase):
         args, kwargs = mock_post.call_args
         payload = kwargs["data"]
         self.assertIn("DOWN", payload["topic"])
+
+    @patch("hc.api.transports.requests.request")
+    def test_zulip_returns_error(self, mock_post):
+        definition = {
+            "bot_email": "bot@example.org",
+            "api_key": "fake-key",
+            "mtype": "stream",
+            "to": "general",
+        }
+        self._setup_data("zulip", json.dumps(definition))
+        mock_post.return_value.status_code = 403
+        mock_post.return_value.json.return_value = {"msg": "Nice try"}
+
+        self.channel.notify(self.check)
+
+        n = Notification.objects.first()
+        self.assertEqual(n.error, 'Received status code 403 with a message: "Nice try"')

hc/api/transports.py

@@ -558,15 +558,16 @@ class MsTeams(HttpTransport):
 
 class Zulip(HttpTransport):
     @classmethod
-    def get_error(cls, r):
+    def get_error(cls, response):
         try:
-            doc = r.json()
-            if "msg" in doc:
-                return doc["msg"]
+            m = response.json().get("msg")
+            if m:
+                code = response.status_code
+                return f'Received status code {code} with a message: "{m}"'
         except ValueError:
             pass
 
-        return super().get_error(r)
+        return super().get_error(response)
 
     def notify(self, check):
         _, domain = self.channel.zulip_bot_email.split("@")