code: def testStringFilteringFind(self):
      self.assertEqual(self.g.vs.find("D").index, 3)
      self.assertEqual(self.g.vs.select(2, 3, 4, 2).find("C").index, 2)
      self.assertRaises(
          ValueError, self.g.vs.select(2, 3, 4, 2).find, "F"
      )
      self.assertRaises(ValueError, self.g.vs.find, "NoSuchName")
  
imports: import unittest
  from igraph import Graph, Vertex, VertexSeq
  from .utils import is_pypy
label_desc: Use image node_id 14 for calling the VertexSeqTests obj's underlying member method code with example usage: obj.testStringFilteringFind() without return types