Method test_get_protocol_members

Lib/test/test_typing.py:4427–4467

(self)

        Foo()  # Previously triggered RecursionError

    def test_get_protocol_members(self):
        with self.assertRaisesRegex(TypeError, "not a Protocol"):
            get_protocol_members(object)
        with self.assertRaisesRegex(TypeError, "not a Protocol"):
            get_protocol_members(object())
        with self.assertRaisesRegex(TypeError, "not a Protocol"):
            get_protocol_members(Protocol)
        with self.assertRaisesRegex(TypeError, "not a Protocol"):
            get_protocol_members(Generic)

        class P(Protocol):
            a: int
            def b(self) -> str: ...
            @property
            def c(self) -> int: ...

        self.assertEqual(get_protocol_members(P), {'a', 'b', 'c'})
        self.assertIsInstance(get_protocol_members(P), frozenset)
        self.assertIsNot(get_protocol_members(P), P.__protocol_attrs__)

        class Concrete:
            a: int
            def b(self) -> str: return "capybara"
            @property
            def c(self) -> int: return 5

        with self.assertRaisesRegex(TypeError, "not a Protocol"):
            get_protocol_members(Concrete)
        with self.assertRaisesRegex(TypeError, "not a Protocol"):
            get_protocol_members(Concrete())

        class ConcreteInherit(P):
            a: int = 42
            def b(self) -> str: return "capybara"
            @property
            def c(self) -> int: return 5

        with self.assertRaisesRegex(TypeError, "not a Protocol"):
            get_protocol_members(ConcreteInherit)
        with self.assertRaisesRegex(TypeError, "not a Protocol"):
            get_protocol_members(ConcreteInherit())

    def test_is_protocol(self):
        self.assertTrue(is_protocol(Proto))