old_contents: import unittest
  
  from chrys.utils import best_color_contrast
  
  
  class BestColorContrastTests(unittest.TestCase):
  
      def test_black_on_red(self):
          self.assertEqual(best_color_contrast('#f00000', ['#000000', '#ffffff']), '#000000')
  
new_contents: import unittest
  
  from chrys.utils import best_color_contrast
  
  
  class BestColorContrastTests(unittest.TestCase):
  
      def test_black_on_red(self):
          self.assertEqual(best_color_contrast('#ff0000', ['#000000', '#ffffff']), '#000000')
  
subject: Fix test data