code: def test_get_node_attributes():
      graphs = [
          nx.Graph(),
          nx.DiGraph(),
          nx.MultiGraph(),
          nx.MultiDiGraph(),
      ]
      for G in graphs:
          G = nx.path_graph(3, create_using=G)
          attr = "hello"
          vals = 100
          nx.set_node_attributes(G, vals, attr)
          attrs = nx.get_node_attributes(G, attr)
          assert attrs[0] == vals
          assert attrs[1] == vals
          assert attrs[2] == vals
          default_val = 1
          G.add_node(4)
          attrs = nx.get_node_attributes(G, attr, default=default_val)
          assert attrs[4] == default_val
  
imports: import random
  import pytest
  import networkx
  from networkx.utils import edges_equal, nodes_equal
label_desc: Use image node_id 7 for calling a global function with example usage: test_get_node_attributes() without return types