Method test_property_name

Lib/test/test_property.py:204–255

(self)

        self.assertAlmostEqual(gettotalrefcount() - refs_before, 0, delta=10)

    def test_property_name(self):
        def getter(self):
            return 42

        def setter(self, value):
            pass

        class A:
            @property
            def foo(self):
                return 1

            @foo.setter
            def oof(self, value):
                pass

            bar = property(getter)
            baz = property(None, setter)

        self.assertEqual(A.foo.__name__, 'foo')
        self.assertEqual(A.oof.__name__, 'oof')
        self.assertEqual(A.bar.__name__, 'bar')
        self.assertEqual(A.baz.__name__, 'baz')

        A.quux = property(getter)
        self.assertEqual(A.quux.__name__, 'getter')
        A.quux.__name__ = 'myquux'
        self.assertEqual(A.quux.__name__, 'myquux')
        self.assertEqual(A.bar.__name__, 'bar')  # not affected
        A.quux.__name__ = None
        self.assertIsNone(A.quux.__name__)

        with self.assertRaisesRegex(
            AttributeError, "'property' object has no attribute '__name__'"
        ):
            property(None, setter).__name__

        with self.assertRaisesRegex(
            AttributeError, "'property' object has no attribute '__name__'"
        ):
            property(1).__name__

        class Err:
            def __getattr__(self, attr):
                raise RuntimeError('fail')

        p = property(Err())
        with self.assertRaisesRegex(RuntimeError, 'fail'):
            p.__name__

        p.__name__ = 'not_fail'
        self.assertEqual(p.__name__, 'not_fail')

    def test_property_set_name_incorrect_args(self):
        p = property()