code: def suite():
      foreign_suite = unittest.defaultTestLoader.loadTestsFromTestCase(
          ForeignTests
      )
      return unittest.TestSuite([foreign_suite])
  
imports: import gzip
  import io
  import unittest
  import warnings
  from igraph import Graph, InternalError
  from .utils import temporary_file
label_desc: Use image node_id 1 for calling a global function with example usage: suite() and returns: unittest