def METHOD_NAME(
        self, state_machine_arn, runs, run_status=None, error_code=None):
    expected_params = {'stateMachineArn': state_machine_arn}
    if run_status is not None:
        expected_params['statusFilter'] = run_status
    response = {'executions': [
        {**run, 'stateMachineArn': state_machine_arn,
         'status': run_status if run_status is not None else 'RUNNING',
         'startDate': datetime.now()} for run in runs]}
    self._stub_bifurcator(
        'list_executions', expected_params, response, error_code=error_code)