def METHOD_NAME():
    chemfiles_io = ChemfilesPicklable(XYZ)
    chemfiles_io_pickled = pickle.loads(pickle.dumps(chemfiles_io))
    #  frame has to be first saved to get the right position value.
    #  As opposed to `chemfiles_io.read().positions)
    frame = chemfiles_io.read()
    frame_pickled = chemfiles_io_pickled.read()
    assert_equal(frame.positions[:],
                 frame_pickled.positions[:])