code: def test_read_multiline_adjlist_1(self):
      # Unit test for https://networkx.lanl.gov/trac/ticket/252
      s = b"""# comment line
  1 2
  # comment line
  2
  3
  """
      bytesIO = io.BytesIO(s)
      G = nx.read_multiline_adjlist(bytesIO)
      adj = {"1": {"3": {}, "2": {}}, "3": {"1": {}}, "2": {"1": {}}}
      assert graphs_equal(G, nx.Graph(adj))
  
imports: import io
  import pytest
  import networkx
  from networkx.utils import edges_equal, graphs_equal, nodes_equal
label_desc: Use image node_id 2 for calling the TestAdjlist obj's underlying member method code with example usage: obj.test_read_multiline_adjlist_1() without return types