code: def testBiadjacencyError(self):
      msg = "arguments weighted and multiple can not co-exist"
      with self.assertRaises(ValueError) as e:
          Graph.Biadjacency(
              [[0, 1, 1], [1, 2, 0]], multiple=True, weighted=True
          )
      self.assertIn(msg, e.exception.args)
  
      with self.assertRaises(ValueError) as e:
          Graph.Biadjacency(
              [[0, 1, 1], [1, 2, 0]], multiple=True, weighted="string"
          )
      self.assertIn(msg, e.exception.args)
  
      with self.assertRaises(ValueError) as e:
          Graph.Biadjacency(
              [[0, 1, 1], [1, 2, 0]], multiple=True, weighted=""
          )
      self.assertIn(msg, e.exception.args)
  
file_path: python-igraph/tests/test_bipartite.py
imports: import unittest
  from igraph import Graph
label_desc: Use image node_id 4 for calling the BipartiteTests obj's underlying member method code with example usage: obj.testBiadjacencyError() without return types