docstr: Test check selection from vertica into temporary file and
  after that bulk inserting into mysql
code: def test_select_bulk_insert_transfer(self, *args):
      """
      Test check selection from vertica into temporary file and
      after that bulk inserting into mysql
      """
      task = VerticaToMySqlOperator(
          task_id="test_task_id",
          sql="select a, b, c",
          mysql_table="test_table",
          vertica_conn_id="test_vertica_conn_id",
          mysql_conn_id="test_mysql_conn_id",
          params={},
          bulk_load=True,
          dag=self.dag,
      )
      task.execute(None)
  
file_path: airflow/tests/providers/mysql/transfers/test_vertica_to_mysql.py
imports: from __future__ import annotations
  import datetime
  from unittest import mock
  import pytest
  from airflow.models.dag import DAG
label_desc: Use image node_id 3 for calling the TestVerticaToMySqlTransfer obj's underlying member method code with example usage: obj.test_select_bulk_insert_transfer() without return types