code: def suite():
      vertex_suite = unittest.defaultTestLoader.loadTestsFromTestCase(
          VertexTests
      )
      vs_suite = unittest.defaultTestLoader.loadTestsFromTestCase(
          VertexSeqTests
      )
      return unittest.TestSuite([vertex_suite, vs_suite])
  
imports: import unittest
  from igraph import Graph, Vertex, VertexSeq
  from .utils import is_pypy
label_desc: Use image node_id 1 for calling a global function with example usage: suite() and returns: unittest