code: def test_pca_lighting(self):
      img = np.random.uniform(size=(3, 48, 32))
  
      out = pca_lighting(img, 0.1)
      self.assertEqual(img.shape, out.shape)
      self.assertEqual(img.dtype, out.dtype)
  
      out = pca_lighting(img, 0)
      self.assertEqual(img.shape, out.shape)
      self.assertEqual(img.dtype, out.dtype)
      np.testing.assert_equal(out, img)
  
imports: import unittest
  import numpy
  from chainer import testing
  from chainercv.transforms import pca_lighting
label_desc: Use image node_id 1 for calling the TestPCALighting obj's underlying member method code with example usage: obj.test_pca_lighting() without return types