code: def testCreation(self):
      self.assertTrue(len(VertexSeq(self.g)) == 10)
      self.assertTrue(len(VertexSeq(self.g, 2)) == 1)
      self.assertTrue(len(VertexSeq(self.g, [1, 2, 3])) == 3)
      self.assertTrue(VertexSeq(self.g, [1, 2, 3]).indices == [1, 2, 3])
      self.assertRaises(ValueError, VertexSeq, self.g, 12)
      self.assertRaises(ValueError, VertexSeq, self.g, [12])
      self.assertTrue(self.g.vs.graph == self.g)
  
imports: import unittest
  from igraph import Graph, Vertex, VertexSeq
  from .utils import is_pypy
label_desc: Use image node_id 2 for calling the VertexSeqTests obj's underlying member method code with example usage: obj.testCreation() without return types