def METHOD_NAME():
    m = mmap.mmap(-1, 9)
    for i in range(0, 9):
        m[i] = i
    m[4] = b'\n'[0]
    assert m.readline() == b'\x00\x01\x02\x03\n'
    assert m.readline() == b'\x05\x06\x07\x08'
    m = mmap.mmap(-1, 1024 + 3)
    m[1024] = b'\n'[0]
    m[1025] = b'a'[0]
    m[1026] = b'b'[0]
    assert m.readline() == (b'\x00' * 1024) + b'\n'
    assert m.readline() == b'ab'