code: def testIntersectionManyEdgemap(self):
      gs = [
          Graph.Formula("A-B"),
          Graph.Formula("A-B,C-D"),
      ]
      gs[0].es[0]["attr"] = "set"
      gs[1].es[1]["attr"] = "set_too"
      g = intersection(gs)
      self.assertTrue(g.es["attr"] == ["set"])
  
imports: import unittest
  from igraph import Graph, disjoint_union, intersection, union
label_desc: Use image node_id 22 for calling the OperatorTests obj's underlying member method code with example usage: obj.testIntersectionManyEdgemap() without return types