text: import unittest
  
  from nltkma.translate.meteor_score import meteor_score
  
  class TestMETEOR(unittest.TestCase):
      def test_preprocess(self):
          # Using lists instead of strings specifically to demonstrate use of `preprocess`.
          reference = [['this', 'is', 'a', 'test'], ['this', 'is' 'test']]
          candidate = ['this', 'is', 'a', 'test']
  
          # no `preprocess` argument
          self.assertRaises(TypeError, meteor_score, reference, candidate)
  
          # with `preprocess` argument
          score = meteor_score(reference, candidate, preprocess=lambda x: ' '.join(x))
          assert score == 0.9921875
  