code: def test_mydel(self):
      # test a simple use scenario
  
      # initialize
      mydel = Delegator(int)
      self.assertIs(mydel.delegate, int)
      self.assertEqual(mydel._Delegator__cache, set())
  
      # add an attribute:
      self.assertRaises(AttributeError, mydel.__getattr__, "xyz")
      bl = mydel.bit_length
      self.assertIs(bl, int.bit_length)
      self.assertIs(mydel.__dict__["bit_length"], int.bit_length)
      self.assertEqual(mydel._Delegator__cache, {"bit_length"})
  
      # add a second attribute
      mydel.numerator
      self.assertEqual(
          mydel._Delegator__cache, {"bit_length", "numerator"}
      )
  
      # delete the second (which, however, leaves it in the name cache)
      del mydel.numerator
      self.assertNotIn("numerator", mydel.__dict__)
      self.assertIn("numerator", mydel._Delegator__cache)
  
      # reset by calling .setdelegate, which calls .resetcache
      mydel.setdelegate(float)
      self.assertIs(mydel.delegate, float)
      self.assertNotIn("bit_length", mydel.__dict__)
      self.assertEqual(mydel._Delegator__cache, set())
  
imports: import unittest
  from idlelib.Delegator import Delegator
label_desc: Use image node_id 1 for calling the DelegatorTest obj's underlying member method code with example usage: obj.test_mydel() without return types