class_docstr: Unit tests for the treewidth_min_fill_in function.
code: def test_two_component_graph(self):
      G = nx.Graph()
      G.add_node(1)
      G.add_node(2)
      treewidth, _ = treewidth_min_fill_in(G)
      assert treewidth == 0
  
imports: import itertools
  import networkx
  from networkx.algorithms.approximation import treewidth_min_degree, treewidth_min_fill_in
  from networkx.algorithms.approximation.treewidth import MinDegreeHeuristic, min_fill_in_heuristic
label_desc: Use image node_id 6 for calling the TestTreewidthMinFillIn obj's underlying member method code with example usage: obj.test_two_component_graph() without return types