old_contents: import unittest
  
  import chainer.functions as F
  from chainer import testing
  
  
  @testing.unary_math_function_unittest(F.Square())
  class TestSquare(unittest.TestCase):
      pass
  
  
  testing.run_module(__name__, __file__)
  
new_contents: import unittest
  
  import chainer.functions as F
  from chainer import testing
  
  
  @testing.unary_math_function_unittest(F.square)
  class TestSquare(unittest.TestCase):
      pass
  
  
  testing.run_module(__name__, __file__)
  
subject: fix test