code: def test_init(self):
      op = StepFunctionStartExecutionOperator(
          task_id=self.TASK_ID,
          state_machine_arn=STATE_MACHINE_ARN,
          name=NAME,
          state_machine_input=INPUT,
          aws_conn_id=AWS_CONN_ID,
          region_name=REGION_NAME,
          verify=False,
          botocore_config={"read_timeout": 42},
      )
      assert op.state_machine_arn == STATE_MACHINE_ARN
      assert op.state_machine_arn == STATE_MACHINE_ARN
      assert op.name == NAME
      assert op.input == INPUT
      assert op.hook.aws_conn_id == AWS_CONN_ID
      assert op.hook._region_name == REGION_NAME
      assert op.hook._verify is False
      assert op.hook._config is not None
      assert op.hook._config.read_timeout == 42
  
      op = StepFunctionStartExecutionOperator(
          task_id=self.TASK_ID, state_machine_arn=STATE_MACHINE_ARN
      )
      assert op.hook.aws_conn_id == "aws_default"
      assert op.hook._region_name is None
      assert op.hook._verify is None
      assert op.hook._config is None
  
file_path: airflow/tests/providers/amazon/aws/operators/test_step_function.py
imports: from __future__ import annotations
  from unittest import mock
  import pytest
  from airflow.exceptions import AirflowException, TaskDeferred
  from airflow.providers.amazon.aws.operators.step_function import StepFunctionGetExecutionOutputOperator, StepFunctionStartExecutionOperator
label_desc: Use image node_id 2 for calling the TestStepFunctionStartExecutionOperator obj's underlying member method code with example usage: obj.test_init() without return types