code: def test_backbones():
      backbones = PointCloudSegmentation.available_backbones()
      assert backbones == [
          "randlanet",
          "randlanet_s3dis",
          "randlanet_semantic_kitti",
          "randlanet_toronto3d",
      ]
  
file_path: lightning-flash/tests/pointcloud/segmentation/test_model.py
imports: import pytest
  import torch
  from flash.core.utilities.imports import _TOPIC_POINTCLOUD_AVAILABLE
  from flash.pointcloud.segmentation import PointCloudSegmentation
  from tests.helpers.task_tester import TaskTester
label_desc: Use image node_id 1 for calling a global function with example usage: test_backbones() without return types