code: def test_serialize(self, session):
      import_error = [
          ImportError(
              filename="Lorem_ipsum.py",
              stacktrace="Lorem ipsum",
              timestamp=timezone.parse(self.timestamp, timezone="UTC"),
          )
          for i in range(2)
      ]
      session.add_all(import_error)
      session.commit()
      query = session.query(ImportError)
      query_list = query.all()
      serialized_data = import_error_collection_schema.dump(
          ImportErrorCollection(
              import_errors=query_list, total_entries=2
          )
      )
      # To maintain consistency in the key sequence across the db in tests
      serialized_data["import_errors"][0]["import_error_id"] = 1
      serialized_data["import_errors"][1]["import_error_id"] = 2
      assert {
          "import_errors": [
              {
                  "filename": "Lorem_ipsum.py",
                  "import_error_id": 1,
                  "stack_trace": "Lorem ipsum",
                  "timestamp": "2020-06-10T12:02:44+00:00",
              },
              {
                  "filename": "Lorem_ipsum.py",
                  "import_error_id": 2,
                  "stack_trace": "Lorem ipsum",
                  "timestamp": "2020-06-10T12:02:44+00:00",
              },
          ],
          "total_entries": 2,
      } == serialized_data
  
file_path: airflow/tests/api_connexion/schemas/test_error_schema.py
imports: from __future__ import annotations
  import pytest
  from airflow.api_connexion.schemas.error_schema import ImportErrorCollection, import_error_collection_schema, import_error_schema
  from airflow.models.errors import ImportError
  from airflow.utils import timezone
  from airflow.utils.session import provide_session
  from tests.test_utils.db import clear_db_import_errors
label_desc: Use image node_id 1 for calling the TestErrorCollectionSchema obj's underlying member method code with example usage: obj.test_serialize(session) without return types