Method test_read_non_blocking

Lib/test/test_io/test_textio.py:1413–1426

(self)

    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
    def test_read_non_blocking(self):
        import os
        r, w = os.pipe()
        try:
            os.set_blocking(r, False)
            with self.io.open(r, 'rt') as textfile:
                r = None
                # Nothing has been written so a non-blocking read raises a BlockingIOError exception.
                with self.assertRaises(BlockingIOError):
                    textfile.read()
        finally:
            if r is not None:
                os.close(r)
            os.close(w)


class MemviewBytesIO(io.BytesIO):