def METHOD_NAME():
    iter_unreader = IterUnreader((b'ab', b'cd', b'ef'))
    assert iter_unreader.chunk() == b'ab'
    assert iter_unreader.chunk() == b'cd'
    assert iter_unreader.chunk() == b'ef'
    assert iter_unreader.chunk() == b''
    assert iter_unreader.chunk() == b''