old_contents: import unittest
  
  import numpy as np
  
  from chainer import testing
  from chainercv.transforms import random_flip
  
  
  class TestRandomFlip(unittest.TestCase):
  
      def test_random_flip(self):
          img = np.random.uniform(size=(3, 24, 24))
  
          out, flip_h, flip_v = random_flip(img, random_h=True, random_v=True,
                                   return_flip=True)
  
          expected = img
          if flip_h:
              expected = expected[:, :, ::-1]
          if flip_v:
              expected = expected[:, ::-1, :]
          np.testing.assert_equal(out, expected)
  
  
  testing.run_module(__name__, __file__)
  
new_contents: import unittest
  
  import numpy as np
  
  from chainer import testing
  from chainercv.transforms import random_flip
  
  
  class TestRandomFlip(unittest.TestCase):
  
      def test_random_flip(self):
          img = np.random.uniform(size=(3, 24, 24))
  
          out, flip_h, flip_v = random_flip(img, random_h=True, random_v=True,
                                            return_flip=True)
  
          expected = img
          if flip_h:
              expected = expected[:, :, ::-1]
          if flip_v:
              expected = expected[:, ::-1, :]
          np.testing.assert_equal(out, expected)
  
  
  testing.run_module(__name__, __file__)
  
subject: fix flake8