code: def test_unrecognized_method(self):
      pytest.importorskip("scipy")
      G = nx.path_graph(4)
      pytest.raises(
          nx.NetworkXError,
          nx.algebraic_connectivity,
          G,
          method="unknown",
      )
      pytest.raises(
          nx.NetworkXError, nx.fiedler_vector, G, method="unknown"
      )
  
imports: from math import sqrt
  import pytest
  import networkx
label_desc: Use image node_id 4 for calling the TestAlgebraicConnectivity obj's underlying member method code with example usage: obj.test_unrecognized_method() without return types