code: def test_cron_expression_generator_hourly_returns_expected_value():
      assert CronExpressionGenerator.hourly() == "cron(0 * ? * * *)"
  
imports: from __future__ import absolute_import
  from sagemaker.model_monitor import CronExpressionGenerator
label_desc: Use image node_id 1 for calling a global function with example usage: test_cron_expression_generator_hourly_returns_expected_value() without return types