code: def test_cli_connections_import_should_return_error_if_file_format_is_invalid(
      self, mock_exists, filepath
  ):
      mock_exists.return_value = True
      with pytest.raises(
          AirflowException,
          match=(
              "Unsupported file format. The file must have one of the following extensions: "
              ".env .json .yaml .yml"
          ),
      ):
          connection_command.connections_import(
              self.parser.parse_args(
                  ["connections", "import", filepath]
              )
          )
  
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 3 for calling the TestCliImportConnections obj's underlying member method code with example usage: obj.test_cli_connections_import_should_return_error_if_file_format_is_invalid(mock_exists, filepath) without return types