[codestyle] add type hint to fixture, indicating it is a function that we need to call

collector/tests.py

@@ -1,3 +1,4 @@
+from typing import Callable
 import pytest
 from django.test import Client
 from django.urls import reverse
@@ -41,7 +42,7 @@ def test_entering_same_name_twice_does_not_change_database_entry(data, session:
     ],
 )
 def test_enter_endpoint_accepts_only_post_requests(
-    client: Client, http_method: str, expected_status: int, random_name
+    client: Client, http_method: str, expected_status: int, random_name: Callable[[int], str]
 ):
     request_method = getattr(client, http_method.lower())