Method test_readinto

Lib/test/test_io/test_bufferedio.py:1074–1085

(self)

        self.assertEqual(pair.read1(), b"def")

    def test_readinto(self):
        for method in ("readinto", "readinto1"):
            with self.subTest(method):
                pair = self.tp(self.BytesIO(b"abcdef"), self.MockRawIO())

                data = byteslike(b'\0' * 5)
                self.assertEqual(getattr(pair, method)(data), 5)
                self.assertEqual(bytes(data), b"abcde")

        # gh-138720: C BufferedRWPair would destruct in a bad order resulting in
        # an unraisable exception.
        support.gc_collect()

    def test_write(self):
        w = self.MockRawIO()