code: def test_read_label(self):
      if self.dtype == np.int32:
          img = read_label(self.file)
      else:
          img = read_label(self.file, dtype=self.dtype)
  
      self.assertEqual(img.shape, self.size)
      self.assertEqual(img.dtype, self.dtype)
  
      if self.format in {"bmp", "png"}:
          np.testing.assert_equal(img, self.img.astype(self.dtype))
  
file_path: chainercv/tests/utils_tests/image_tests/test_read_label.py
imports: import numpy
  import tempfile
  import unittest
  from chainer import testing
  from chainercv.utils import read_label
  from chainercv.utils import write_image
label_desc: Use image node_id 2 for calling the TestReadLabel obj's underlying member method code with example usage: obj.test_read_label() without return types