code: def test_clustering(self):
      actual = get_visible_items(turicreate.clustering)
      expected = ["kmeans", "dbscan"]
      check_visible_modules(actual, expected)
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import turicreate
label_desc: Use image node_id 4 for calling the ModuleVisibilityTests obj's underlying member method code with example usage: obj.test_clustering() without return types