code: def test_subscriber_methods():
      # Test that PythonSubscriber satisfies the contract expected by the underlying Scala trait
      # it implements (MlflowAutologEventSubscriber)
      subscriber = PythonSubscriber()
      subscriber.ping()
      # Assert repl ID is stable & different between subscribers
      assert subscriber.replId() == subscriber.replId()
      assert PythonSubscriber().replId() != subscriber.replId()
  
file_path: mlflow/tests/spark/autologging/datasource/test_spark_datasource_autologging_unit.py
imports: from unittest import mock
  import pytest
  import mlflow
  import mlflow.spark
  from mlflow._spark_autologging import PythonSubscriber, _get_current_listener
  from mlflow.exceptions import MlflowException
  from tests.spark.autologging.utils import _get_or_create_spark_session
label_desc: Use image node_id 4 for calling a global function with example usage: test_subscriber_methods() without return types