code: def test_mul(self):
      self.assertEqual(1j * int(20), complex(0, 20))
      self.assertEqual(1j * int(-1), complex(0, -1))
      self.assertRaises(OverflowError, operator.mul, 1j, 10**1000)
      self.assertRaises(TypeError, operator.mul, 1j, None)
      self.assertRaises(TypeError, operator.mul, None, 1j)
  
imports: import unittest
  import sys
  from test import support
  from test.test_grammar import VALID_UNDERSCORE_LITERALS, INVALID_UNDERSCORE_LITERALS
  from random import random
  from math import atan2, isnan, copysign
  import operator
label_desc: Use image node_id 14 for calling the ComplexTest obj's underlying member method code with example usage: obj.test_mul() without return types