code: def test_cron_expression_generator_daily_returns_expected_value_when_called_with_no_parameters():
      assert CronExpressionGenerator.daily() == "cron(0 0 ? * * *)"
  
imports: from __future__ import absolute_import
  from sagemaker.model_monitor import CronExpressionGenerator
label_desc: Use image node_id 2 for calling a global function with example usage: test_cron_expression_generator_daily_returns_expected_value_when_called_with_no_parameters() without return types