code: def test_two_nodes_multigraph(self, method):
      pytest.importorskip("scipy")
      G = nx.MultiGraph()
      G.add_edge(0, 0, spam=1e8)
      G.add_edge(0, 1, spam=1)
      G.add_edge(0, 1, spam=-2)
      A = -3 * nx.laplacian_matrix(G, weight="spam")
      assert nx.algebraic_connectivity(
          G, weight="spam", tol=1e-12, method=method
      ) == pytest.approx(6, abs=1e-7)
      x = nx.fiedler_vector(G, weight="spam", tol=1e-12, method=method)
      check_eigenvector(A, 6, x)
  
imports: from math import sqrt
  import pytest
  import networkx
label_desc: Use image node_id 6 for calling the TestAlgebraicConnectivity obj's underlying member method code with example usage: obj.test_two_nodes_multigraph(method) without return types