1  "Test delegator, coverage 100%."
       2  
       3  from idlelib.delegator import Delegator
       4  import unittest
       5  
       6  
       7  class ESC[4;38;5;81mDelegatorTest(ESC[4;38;5;149munittestESC[4;38;5;149m.ESC[4;38;5;149mTestCase):
       8  
       9      def test_mydel(self):
      10          # Test a simple use scenario.
      11  
      12          # Initialize an int delegator.
      13          mydel = Delegator(int)
      14          self.assertIs(mydel.delegate, int)
      15          self.assertEqual(mydel._Delegator__cache, set())
      16          # Trying to access a non-attribute of int fails.
      17          self.assertRaises(AttributeError, mydel.__getattr__, 'xyz')
      18  
      19          # Add real int attribute 'bit_length' by accessing it.
      20          bl = mydel.bit_length
      21          self.assertIs(bl, int.bit_length)
      22          self.assertIs(mydel.__dict__['bit_length'], int.bit_length)
      23          self.assertEqual(mydel._Delegator__cache, {'bit_length'})
      24  
      25          # Add attribute 'numerator'.
      26          mydel.numerator
      27          self.assertEqual(mydel._Delegator__cache, {'bit_length', 'numerator'})
      28  
      29          # Delete 'numerator'.
      30          del mydel.numerator
      31          self.assertNotIn('numerator', mydel.__dict__)
      32          # The current implementation leaves  it in the name cache.
      33          # self.assertIn('numerator', mydel._Delegator__cache)
      34          # However, this is not required and not part of the specification
      35  
      36          # Change delegate to float, first resetting the attributes.
      37          mydel.setdelegate(float)  # calls resetcache
      38          self.assertNotIn('bit_length', mydel.__dict__)
      39          self.assertEqual(mydel._Delegator__cache, set())
      40          self.assertIs(mydel.delegate, float)
      41  
      42  
      43  if __name__ == '__main__':
      44      unittest.main(verbosity=2, exit=2)