code: def test_resolve_at_schedule_expression_timezone(
      input_dt, expected_dt
  ):
      schedule = PipelineSchedule(at=input_dt)
      assert schedule.resolve_schedule_expression() == expected_dt
  
imports: from __future__ import absolute_import
  from datetime import datetime
  import pytest
  import pytz
  from mock.mock import ANY
  from sagemaker.workflow.parameters import ParameterInteger, ParameterFloat, ParameterBoolean
  from sagemaker import Session
  from sagemaker.workflow import ParameterString
  from sagemaker.workflow._event_bridge_client_helper import EXECUTION_TIME_PIPELINE_PARAMETER_FORMAT
  from sagemaker.workflow.pipeline import Pipeline
  from mock import Mock, patch
  from sagemaker.workflow.triggers import PipelineSchedule, validate_default_parameters_for_schedules
  from tests.unit.sagemaker.workflow.helpers import CustomStep
label_desc: Use image node_id 5 for calling a global function with example usage: test_resolve_at_schedule_expression_timezone(input_dt, expected_dt) without return types