code: def test_init(self):
      assert self.emr_containers.aws_conn_id == "aws_default"
      assert self.emr_containers.virtual_cluster_id == "vc1234"
  
file_path: airflow/tests/providers/amazon/aws/hooks/test_emr_containers.py
imports: from __future__ import annotations
  from unittest import mock
  import pytest
  from airflow.providers.amazon.aws.hooks.emr import EmrContainerHook
label_desc: Use image node_id 2 for calling the TestEmrContainerHook obj's underlying member method code with example usage: obj.test_init() without return types