Method test_fileno

Lib/test/test_io.py:1270–1274

(self)

        repr(buf)  # Should still work

    def test_fileno(self):
        rawio = self.MockRawIO()
        bufio = self.tp(rawio)

        self.assertEqual(42, bufio.fileno())

    def test_invalid_args(self):
        rawio = self.MockRawIO()