docstr: Test variable_delete command
docstr_tok: ["Test","variable_delete","command"]
code: def test_variables_delete(self):
      """Test variable_delete command"""
      variable_command.variables_set(
          self.parser.parse_args(["variables", "set", "foo", "bar"])
      )
      variable_command.variables_delete(
          self.parser.parse_args(["variables", "delete", "foo"])
      )
      with pytest.raises(KeyError):
          Variable.get("foo")
  
imports: from __future__ import annotations
  import os
  from contextlib import redirect_stdout
  from io import StringIO
  import pytest
  from sqlalchemy import select
  from airflow import models
  from airflow.cli import cli_parser
  from airflow.cli.commands import variable_command
  from airflow.models import Variable
  from airflow.utils.session import create_session
  from tests.test_utils.db import clear_db_variables
label_desc: Use image node_id 11 for calling the TestCliVariables obj's underlying member method code with example usage: obj.test_variables_delete() without return types