code: def test_field(self) -> None:
      class Foo(HasProps):
          col = bcpd.HatchPatternSpec("colorfield")
  
      desc = Foo.__dict__["col"]
  
      f = Foo()
      assert f.col == "colorfield"
      assert desc.get_value(f) == Field("colorfield")
  
      f.col = "myfield"
      assert f.col == "myfield"
      assert desc.get_value(f) == Field("myfield")
  
      f.col = "dot"
      assert f.col == "dot"
      assert desc.get_value(f) == Value("dot")
  
      f.col = "/"
      assert f.col == "/"
      assert desc.get_value(f) == Value("/")
  
imports: from __future__ import annotations
  import pytest
  import datetime
  import warnings
  from copy import copy
  import numpy
  import pandas
  from bokeh.core.has_props import HasProps, Local
  from bokeh.core.property.vectorization import Field, Value, field, value
  from tests.support.util.api import verify_all
  import bokeh.core.property.dataspec
label_desc: Use image node_id 1 for calling the Test_HatchPatternSpec obj's underlying member method code with example usage: obj.test_field() without return types