code: def test_class_cause_nonexception_result(self):
      class ConstructsNone(BaseException):
          @classmethod
          def __new__(*args, **kwargs):
              return None
  
      try:
          raise IndexError from ConstructsNone
      except TypeError as e:
          self.assertIn(
              "should have returned an instance of BaseException",
              str(e),
          )
      except IndexError:
          self.fail("Wrong kind of exception raised")
      else:
          self.fail("No exception raised")
  
imports: from test import support
  import sys
  import types
  import unittest
label_desc: Use image node_id 4 for calling the TestCause obj's underlying member method code with example usage: obj.test_class_cause_nonexception_result() and returns: None