old_contents: import unittest
  
  from cupy import testing
  
  
  @testing.gpu
  class TestInsert(unittest.TestCase):
  
      _multiprocess_can_split_ = True
  
      @testing.for_all_dtypes()
      @testing.numpy_cupy_array_equal()
      def test_fill_diagonal_shape1(self, xp, dtype):
          a = testing.shaped_arange((3, 3), xp, dtype)
          xp.fill_diag(a, val=0)
          return a
  
      @testing.for_all_dtypes()
      @testing.numpy_cupy_array_equal()
      def test_fill_diagonal_shape2(self, xp, dtype):
          a = testing.shaped_arange((2, 2, 2), xp, dtype)
          xp.fill_diag(a, val=1)
          return a
  
      @testing.for_all_dtypes()
      @testing.numpy_cupy_array_equal()
      def test_fill_diagonal_wrap1(self, xp, dtype):
          a = testing.shaped_arange((3, 5), xp, dtype)
          xp.fill_diag(a, val=0, wrap=True)
          return a
  
      @testing.for_all_dtypes()
      @testing.numpy_cupy_array_equal()
      def test_fill_diagonal_wrap2(self, xp, dtype):
          a = testing.shaped_arange((5, 3), xp, dtype)
          xp.fill_diag(a, val=0, wrap=True)
          return a
  
new_contents: import unittest
  
  from cupy import testing
  
  
  @testing.gpu
  class TestInsert(unittest.TestCase):
  
      _multiprocess_can_split_ = True
  
      @testing.for_all_dtypes()
      @testing.numpy_cupy_array_equal()
      def test_fill_diagonal_shape1(self, xp, dtype):
          a = testing.shaped_arange((3, 3), xp, dtype)
          xp.fill_diagonal(a, val=0)
          return a
  
      @testing.for_all_dtypes()
      @testing.numpy_cupy_array_equal()
      def test_fill_diagonal_shape2(self, xp, dtype):
          a = testing.shaped_arange((2, 2, 2), xp, dtype)
          xp.fill_diagonal(a, val=1)
          return a
  
      @testing.for_all_dtypes()
      @testing.numpy_cupy_array_equal()
      def test_fill_diagonal_wrap1(self, xp, dtype):
          a = testing.shaped_arange((3, 5), xp, dtype)
          xp.fill_diagonal(a, val=0, wrap=True)
          return a
  
      @testing.for_all_dtypes()
      @testing.numpy_cupy_array_equal()
      def test_fill_diagonal_wrap2(self, xp, dtype):
          a = testing.shaped_arange((5, 3), xp, dtype)
          xp.fill_diagonal(a, val=0, wrap=True)
          return a
  
subject: Fix typo