def METHOD_NAME(cls) -> None:
    super().METHOD_NAME()
    cube = new_cube(width=18, height=9, x_res=20, y_res=20)
    cls.fs, cls.root = cls.get_fs_root()
    cls.fs.delete(cls.root, recursive=True)
    dir_path = f'{cls.root}/l1b'
    cls.fs.mkdir(dir_path)
    for i in range(3):
        zarr_path = f'{dir_path}/olci-l1b-2022050{i + 1}.zarr'
        cube.to_zarr(cls.fs.get_mapper(root=zarr_path), mode='w')
    dir_path = f'{cls.root}/l2'
    cls.fs.mkdir(dir_path)
    for i in range(3):
        zarr_path = f'{dir_path}/olci-l2-2022050{i + 1}.zarr'
        cube.to_zarr(cls.fs.get_mapper(root=zarr_path), mode='w')
    dir_path = f'{cls.root}/l3'
    cls.fs.mkdir(dir_path)
    for i in ['2020', '2021']:
        levels_path = f'{dir_path}/olci-l3-{i}.levels'
        cls.fs.mkdir(levels_path)
        for j in range(4):
            zarr_path = f'{levels_path}/{j}.zarr'
            cube.to_zarr(cls.fs.get_mapper(root=zarr_path), mode='w')