Method test_ByteString

Lib/test/test_collections.py:1938–1966

(self)

                            nativeseq, seqseq, (letter, start, stop))

    def test_ByteString(self):
        previous_sys_modules = sys.modules.copy()
        self.addCleanup(sys.modules.update, previous_sys_modules)

        for module in "collections", "_collections_abc", "collections.abc":
            sys.modules.pop(module, None)

        with self.assertWarns(DeprecationWarning):
            from collections.abc import ByteString
        for sample in [bytes, bytearray]:
            with self.assertWarns(DeprecationWarning):
                self.assertIsInstance(sample(), ByteString)
            self.assertTrue(issubclass(sample, ByteString))
        for sample in [str, list, tuple]:
            with self.assertWarns(DeprecationWarning):
                self.assertNotIsInstance(sample(), ByteString)
            self.assertFalse(issubclass(sample, ByteString))
        with self.assertWarns(DeprecationWarning):
            self.assertNotIsInstance(memoryview(b""), ByteString)
        self.assertFalse(issubclass(memoryview, ByteString))
        with self.assertWarns(DeprecationWarning):
            self.validate_abstract_methods(ByteString, '__getitem__', '__len__')

        with self.assertWarns(DeprecationWarning):
            class X(ByteString): pass

        with self.assertWarns(DeprecationWarning):
            # No metaclass conflict
            class Z(ByteString, Awaitable): pass

    def test_ByteString_attribute_access(self):
        collections_abc = import_fresh_module(