code: def test_cli_connections_import_should_overwrite_existing_connections(
      self, mock_exists, mock_parse_secret_file, session=None
  ):
      mock_exists.return_value = True
  
      # Add a pre-existing connection "new3"
      merge_conn(
          Connection(
              conn_id="new3",
              conn_type="mysql",
              description="original description",
              host="mysql",
              login="root",
              password="password",
              schema="airflow",
          ),
          session=session,
      )
  
      # Sample connections to import, including a collision with "new3"
      expected_connections = {
          "new2": {
              "conn_type": "postgres",
              "description": "new2 description",
              "host": "host",
              "login": "airflow",
              "password": "password",
              "port": 5432,
              "schema": "airflow",
              "extra": "test",
          },
          "new3": {
              "conn_type": "mysql",
              "description": "updated description",
              "host": "host",
              "login": "airflow",
              "password": "new password",
              "port": 3306,
              "schema": "airflow",
              "extra": "test",
          },
      }
  
      # We're not testing the behavior of _parse_secret_file, assume it successfully reads JSON, YAML or env
      mock_parse_secret_file.return_value = expected_connections
  
      with redirect_stdout(StringIO()) as stdout:
          connection_command.connections_import(
              self.parser.parse_args(
                  [
                      "connections",
                      "import",
                      "sample.json",
                      "--overwrite",
                  ]
              )
          )
  
          assert (
              "Could not import connection new3: connection already exists."
              not in stdout.getvalue()
          )
  
      # Verify that the imported connections match the expected, sample connections
      current_conns = session.query(Connection).all()
  
      comparable_attrs = [
          "conn_id",
          "conn_type",
          "description",
          "host",
          "login",
          "password",
          "port",
          "schema",
          "extra",
      ]
  
      current_conns_as_dicts = {
          current_conn.conn_id: {
              attr: getattr(current_conn, attr)
              for attr in comparable_attrs
          }
          for current_conn in current_conns
      }
      assert (
          current_conns_as_dicts["new2"] == expected_connections["new2"]
      )
  
      # The existing connection should have been overwritten
      assert (
          current_conns_as_dicts["new3"] == expected_connections["new3"]
      )
  
imports: from __future__ import annotations
  import json
  import os
  import re
  import shlex
  import warnings
  from contextlib import redirect_stdout
  from io import StringIO
  from unittest import mock
  import pytest
  from airflow.cli import cli_config, cli_parser
  from airflow.cli.commands import connection_command
  from airflow.exceptions import AirflowException
  from airflow.models import Connection
  from airflow.utils.db import merge_conn
  from airflow.utils.session import create_session, provide_session
  from tests.test_utils.db import clear_db_connections
label_desc: Use image node_id 6 for calling the TestCliImportConnections obj's underlying member method code with example usage: obj.test_cli_connections_import_should_overwrite_existing_connections(mock_exists, mock_parse_secret_file, session) without return types