code: def test_directed(self, method):
      G = nx.DiGraph()
      pytest.raises(
          nx.NetworkXNotImplemented,
          nx.algebraic_connectivity,
          G,
          method=method,
      )
      pytest.raises(
          nx.NetworkXNotImplemented, nx.fiedler_vector, G, method=method
      )
  
imports: from math import sqrt
  import pytest
  import networkx
label_desc: Use image node_id 1 for calling the TestAlgebraicConnectivity obj's underlying member method code with example usage: obj.test_directed(method) without return types