docstr: ...Test that an attribute that has not been set cannot be got and
  has correct error message
docstr_tok: ["...","Test","that","an","attribute","that","has","not","been","set","can","not","be","got","and","has","correct","error","message"]
code: def test_cannot_access_unset(self):
      """...Test that an attribute that has not been set cannot be got and
      has correct error message
      """
  
      def f():
          return self.a0.update_time
  
      self.assertRaisesRegex(
          AttributeError,
          "'A0' object has no attribute 'update_time'",
          f,
      )
  
imports: import sys
  import unittest
  from tick.base import Base
  from tick.base.build.base import A0
label_desc: Use image node_id 8 for calling the Test obj's underlying member method code with example usage: obj.test_cannot_access_unset() and returns: self