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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.assertEqual(bl, int.bit_length)
self.assertEqual(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)
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