code: def test_dont_mask_non_attribute_error(self):
      class I:
          pass
  
      class C(object):
          def getbases(self):
              raise RuntimeError
  
          __bases__ = property(getbases)
  
      self.assertRaises(RuntimeError, isinstance, I(), C())
  
imports: import unittest
  import typing
  from test import support
label_desc: Use image node_id 3 for calling the TestIsInstanceExceptions obj's underlying member method code with example usage: obj.test_dont_mask_non_attribute_error() without return types