code: def test_center_crop(self):
      img = np.random.uniform(size=(3, 48, 32))
  
      out, param = center_crop(img, (24, 16), return_param=True)
      y_slice = param["y_slice"]
      x_slice = param["x_slice"]
  
      np.testing.assert_equal(out, img[:, y_slice, x_slice])
      self.assertEqual(y_slice, slice(12, 36))
      self.assertEqual(x_slice, slice(8, 24))
  
imports: import unittest
  import numpy
  from chainer import testing
  from chainercv.transforms import center_crop
label_desc: Use image node_id 1 for calling the TestCenterCrop obj's underlying member method code with example usage: obj.test_center_crop() without return types