code: def test_vis_bbox(self):
      ax = vis_bbox(
          self.img,
          self.bbox,
          self.label,
          self.score,
          label_names=self.label_names,
          instance_colors=self.instance_colors,
          sort_by_score=self.sort_by_score,
      )
  
      self.assertIsInstance(ax, matplotlib.axes.Axes)
  
file_path: chainercv/tests/visualizations_tests/test_vis_bbox.py
imports: import unittest
  import numpy
  from chainer import testing
  from chainercv.utils import generate_random_bbox
  from chainercv.visualizations import vis_bbox
label_desc: Use image node_id 2 for calling the TestVisBbox obj's underlying member method code with example usage: obj.test_vis_bbox() without return types