new_contents: import unittest
  
  from Utils import log, retrieve_stdout
  
  
  class UtilsTest(unittest.TestCase):
      def test_retrieve_stdout(self):
          with retrieve_stdout() as sio:
              print("test")
              self.assertEqual(sio.getvalue(), "test\n")
  
      def test_log(self):
          with retrieve_stdout() as sio:
              log("test")
              self.assertEqual(sio.getvalue(), " COALA - test\n")
  
  
  if __name__ == '__main__':
      unittest.main(verbosity=2)
  
subject: Add tests for Utils