text: # Copyright 2020 - 2021 MONAI Consortium
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #     http://www.apache.org/licenses/LICENSE-2.0
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import unittest
  from typing import TYPE_CHECKING
  from unittest import skipUnless
  
  import numpy as np
  from parameterized import parameterized
  
  from monai.transforms import ToPIL
  from monai.utils import optional_import
  from tests.utils import TEST_NDARRAYS, assert_allclose
  
  if TYPE_CHECKING:
      from PIL.Image import Image as PILImageImage
      from PIL.Image import fromarray as pil_image_fromarray
  
      has_pil = True
  else:
      pil_image_fromarray, has_pil = optional_import("PIL.Image", name="fromarray")
      PILImageImage, _ = optional_import("PIL.Image", name="Image")
  
  im = [[1.0, 2.0], [3.0, 4.0]]
  TESTS = []
  for p in TEST_NDARRAYS:
      TESTS.append([p(im)])
  if has_pil:
      TESTS.append([pil_image_fromarray(np.array(im))])
  
  
  class TestToPIL(unittest.TestCase):
      @parameterized.expand(TESTS)
      @skipUnless(has_pil, "Requires `pillow` package.")
      def test_value(self, test_data):
          result = ToPIL()(test_data)
          self.assertTrue(isinstance(result, PILImageImage))
          assert_allclose(np.array(result), test_data)
  
  
  if __name__ == "__main__":
      unittest.main()
  