| import unittest |
| from idlelib.Delegator import Delegator |
| |
| class DelegatorTest(unittest.TestCase): |
| |
| 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()) |
| |
| if __name__ == '__main__': |
| unittest.main(verbosity=2, exit=2) |
