code: def test_num_colors(self):
      G = nx.Graph()
      G.add_edges_from([(0, 1), (0, 2), (0, 3)])
      pytest.raises(
          nx.NetworkXAlgorithmError, nx.coloring.equitable_color, G, 2
      )
  
imports: import itertools
  import pytest
  import networkx
label_desc: Use image node_id 9 for calling the TestColoring obj's underlying member method code with example usage: obj.test_num_colors() without return types