old_contents: import unittest
  from .. import util
  
  
  class TestUtil(unittest.TestCase):
      def test_adder(self):
          self.assertEqual(util.adder(3, 5), 8)
  
      def test_adder2(self):
          self.assertEqual(util.adder(-3, -5), -8)
  
new_contents: import unittest
  from cmdlinetool import util
  
  
  class TestUtil(unittest.TestCase):
      def test_adder(self):
          self.assertEqual(util.adder(3, 5), 8)
  
      def test_adder2(self):
          self.assertEqual(util.adder(-3, -5), -8)
  
subject: Update test_util.py