class_docstr: A setting that displays a path name
  
  text - text to display to right
  value - initial value
  wildcard - wildcard to filter files in browse dialog
code: def test_valid(self, pipeline):
      if not os.path.isfile(self.value):
          raise ValidationError(
              "Can't find file, %s" % self.value, self
          )
  
imports: import os.path
  from .._text import Text
  from ..._validation_error import ValidationError
label_desc: Use image node_id 2 for calling the Pathname obj's underlying member method code with example usage: obj.test_valid(pipeline) without return types