code: def test_edge_cases_directed_edge_swap():
      # Tests cases when swaps are impossible, either too few edges exist, or self loops/cycles are unavoidable
      # TODO: Rewrite function to explicitly check for impossible swaps and raise error
      e = (
          "Maximum number of swap attempts \\(11\\) exceeded "
          "before desired swaps achieved \\(\\d\\)."
      )
      graph = nx.DiGraph([(0, 0), (0, 1), (1, 0), (2, 3), (3, 2)])
      with pytest.raises(nx.NetworkXAlgorithmError, match=e):
          nx.directed_edge_swap(graph, nswap=1, max_tries=10, seed=1)
  
imports: import pytest
  import networkx
label_desc: Use image node_id 2 for calling a global function with example usage: test_edge_cases_directed_edge_swap() without return types