code: def testIntegerFilteringFind(self):
      self.assertEqual(self.g.vs.find(3).index, 3)
      self.assertEqual(self.g.vs.select(2, 3, 4, 2).find(3).index, 2)
      self.assertRaises(IndexError, self.g.vs.find, 17)
  
imports: import unittest
  from igraph import Graph, Vertex, VertexSeq
  from .utils import is_pypy
label_desc: Use image node_id 12 for calling the VertexSeqTests obj's underlying member method code with example usage: obj.testIntegerFilteringFind() without return types