Fix more linter complaints

Signed-off-by: Denys Fedoryshchenko <denys.f@collabora.com>

Author: nuclearcat

tests/unit_tests/test_events_handler.py

@@ -43,11 +43,13 @@ def test_get_events_filter_by_ids(mock_db_find_by_attributes, test_client):
 
 
 def test_get_events_rejects_both_id_and_ids(test_client):
+    """GET /events rejects requests with both id and ids parameters."""
     resp = test_client.get("events?id=deadbeefdeadbeefdeadbeef&ids=deadbeefdeadbeefdeadbeef")
     assert resp.status_code == 400
 
 
 def test_get_events_rejects_invalid_id(test_client):
+    """GET /events rejects invalid ObjectId format."""
     resp = test_client.get("events?id=not-an-objectid")
     assert resp.status_code == 400
 
@@ -66,6 +68,7 @@ def test_get_events_filter_by_node_id_alias(mock_db_find_by_attributes, test_cli
 
 
 def test_get_events_rejects_node_id_and_data_id(test_client):
+    """GET /events rejects requests with both node_id and data.id parameters."""
     resp = test_client.get(
         "events?node_id=693af4f5fee8383e92b6b0eb&data.id=693af4f5fee8383e92b6b0eb"
     )