Method test_buffered_readinto_mixin

Lib/test/test_io/test_general.py:697–708

(self)

                self.open(os_helper.TESTFN, 'w', encoding="utf-8", newline='invalid')

    def test_buffered_readinto_mixin(self):
        # Test the implementation provided by BufferedIOBase
        class Stream(self.BufferedIOBase):
            def read(self, size):
                return b"12345"
            read1 = read
        stream = Stream()
        for method in ("readinto", "readinto1"):
            with self.subTest(method):
                buffer = byteslike(5)
                self.assertEqual(getattr(stream, method)(buffer), 5)
                self.assertEqual(bytes(buffer), b"12345")

    def test_fspath_support(self):
        def check_path_succeeds(path):