"Test delegator, coverage 100%." from idlelib.delegator import Delegator import unittest class DelegatorTest(unittest.TestCase): def test_mydel(self): # Test a simple use scenario. # Initialize an int delegator. mydel = Delegator(int) self.assertIs(mydel.delegate, int) self.assertEqual(mydel._Delegator__cache, set()) # Trying to access a non-attribute of int fails. self.assertRaises(AttributeError, mydel.__getattr__, 'xyz') # Add real int attribute 'bit_length' by accessing it. 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 attribute 'numerator'. mydel.numerator self.assertEqual(mydel._Delegator__cache, {'bit_length', 'numerator'}) # Delete 'numerator'. del mydel.numerator self.assertNotIn('numerator', mydel.__dict__) # The current implementation leaves it in the name cache. # self.assertIn('numerator', mydel._Delegator__cache) # However, this is not required and not part of the specification # Change delegate to float, first resetting the attributes. mydel.setdelegate(float) # calls resetcache self.assertNotIn('bit_length', mydel.__dict__) self.assertEqual(mydel._Delegator__cache, set()) self.assertIs(mydel.delegate, float) if __name__ == '__main__': unittest.main(verbosity=2, exit=2)