class_docstr: Unit tests for the approximate minimum weighted vertex cover
  function,
  :func:`~networkx.algorithms.approximation.vertex_cover.min_weighted_vertex_cover`.
code: def test_unweighted_undirected(self):
      # create a simple star graph
      size = 50
      sg = nx.star_graph(size)
      cover = min_weighted_vertex_cover(sg)
      assert 1 == len(cover)
      assert is_cover(sg, cover)
  
file_path: networkx/networkx/algorithms/approximation/tests/test_vertex_cover.py
imports: import networkx
  from networkx.algorithms.approximation import min_weighted_vertex_cover
label_desc: Use image node_id 2 for calling the TestMWVC obj's underlying member method code with example usage: obj.test_unweighted_undirected() without return types