code: def test_init_with_follow_sets_bounds_to_none(self) -> None:
      datarange1d = DataRange1d(follow="start")
      assert datarange1d.follow == "start"
      assert datarange1d.bounds is None
  
imports: from __future__ import annotations
  import pytest
  import datetime
  from math import isnan
  from unittest import mock
  from bokeh.core.validation import check_integrity, process_validation_issues
  from _util_models import check_properties_existence
  from bokeh.models import Range1d, DataRange1d, FactorRange
label_desc: Use image node_id 7 for calling the Test_DataRange1d obj's underlying member method code with example usage: obj.test_init_with_follow_sets_bounds_to_none() without return types