code: def suite():
      random_walk_suite = (
          unittest.defaultTestLoader.loadTestsFromTestCase(
              RandomWalkTests
          )
      )
      return unittest.TestSuite([random_walk_suite])
  
file_path: python-igraph/tests/test_walks.py
imports: import random
  import unittest
  from igraph import Graph, InternalError
label_desc: Use image node_id 1 for calling a global function with example usage: suite() and returns: unittest