code: def testVertexNameIndexingBug196(self):
      g = Graph()
      a, b = b"a", b"b"
      g.add_vertices([a, b])
      g.add_edges([(a, b)])
      self.assertEqual(g.ecount(), 1)
      self.assertTrue(g.are_connected(a, b))
  
imports: import unittest
  from igraph import Graph
label_desc: Use image node_id 9 for calling the AttributeTests obj's underlying member method code with example usage: obj.testVertexNameIndexingBug196() without return types