code: def setUp(self):
      if not hasattr(self, "bbox"):
          self.bbox = np.hstack((self.tl, self.tl + self.hw))
      if not hasattr(self, "size"):
          self.size = None
  
file_path: chainercv/tests/utils_tests/testing_tests/assertions_tests/test_assert_is_bbox.py
imports: import numpy
  import unittest
  from chainercv.utils import assert_is_bbox
  from chainercv.utils import testing
label_desc: Use image node_id 1 for calling the TestAssertIsBbox obj's underlying member method code with example usage: obj.setUp() without return types