code: def testAllSequence(self):
      self.assertTrue(len(self.g.vs) == 10)
      self.assertTrue(self.g.vs["test"] == list(range(10)))
  
imports: import unittest
  from igraph import Graph, Vertex, VertexSeq
  from .utils import is_pypy
label_desc: Use image node_id 7 for calling the VertexSeqTests obj's underlying member method code with example usage: obj.testAllSequence() without return types