code: def test_user_index_method(self):
      bignum = 2 * sys.maxsize
      smallnum = 42
  
      # User-defined class with an __index__ method
      class I:
          def __init__(self, n):
              self.n = int(n)
  
          def __index__(self):
              return self.n
  
      self.assertEqual(list(range(I(bignum), I(bignum + 1))), [bignum])
      self.assertEqual(
          list(range(I(smallnum), I(smallnum + 1))), [smallnum]
      )
  
      # User-defined class with a failing __index__ method
      class IX:
          def __index__(self):
              raise RuntimeError
  
      self.assertRaises(RuntimeError, range, IX())
  
      # User-defined class with an invalid __index__ method
      class IN:
          def __index__(self):
              return "not a number"
  
      self.assertRaises(TypeError, range, IN())
  
      # Test use of user-defined classes in slice indices.
      self.assertEqual(range(10)[: I(5)], range(5))
  
      with self.assertRaises(RuntimeError):
          range(0, 10)[: IX()]
  
      with self.assertRaises(TypeError):
          range(0, 10)[: IN()]
  
imports: import unittest
  import sys
  import pickle
  import itertools
  from test.support import ALWAYS_EQ
label_desc: Use image node_id 8 for calling the RangeTest obj's underlying member method code with example usage: obj.test_user_index_method() and returns: self, str