code: def test_directed_edges_linestyle_default():
      """Test default linestyle for edges drawn with FancyArrowPatches."""
      G = nx.path_graph(
          4, create_using=nx.DiGraph
      )  # Graph with 3 edges
      pos = {n: (n, n) for n in range(len(G))}
  
      # edge with default style
      drawn_edges = nx.draw_networkx_edges(G, pos)
      assert len(drawn_edges) == 3
      for fap in drawn_edges:
          assert fap.get_linestyle() == "solid"
  
imports: import itertools
  import os
  import warnings
  import pytest
  import networkx
label_desc: Use image node_id 17 for calling a global function with example usage: test_directed_edges_linestyle_default() without return types