code: def setUp(self):
      self.link = DummyYOLO()
  
imports: import mock
  import numpy
  import unittest
  import chainer
  from chainer.backends.cuda import to_cpu
  from chainer import testing
  from chainer.testing import attr
  from chainercv.links.model.yolo import YOLOBase
  from chainercv.utils import assert_is_detection_link
  from chainercv.utils import generate_random_bbox
label_desc: Use image node_id 1 for calling the TestYOLOBase obj's underlying member method code with example usage: obj.setUp() without return types