def METHOD_NAME(gui: Gui, helpers):
    accessor = _ArrayDictDataAccessor()
    ret_data = accessor.get_data(gui, "x", an_array, {"start": 0, "end": -1}, _DataFormat.JSON)
    assert ret_data
    value = ret_data["value"]
    assert value
    assert value["rowcount"] == 3
    data = value["data"]
    assert len(data) == 3