new_contents: import unittest
  from plumbum.cmd import true
  
  
  class TestPathToList(unittest.TestCase):
      def test_path_to_list(self):
          from benchbuild.utils.path import path_to_list
          p = path_to_list("a:b")
          self.assertEqual(p, ["a", "b"])
  
          p = path_to_list("a")
          self.assertEqual(p, ["a"])
  
          p = path_to_list("")
          self.assertEqual(p, [])
  
      def test_list_to_path(self):
          from benchbuild.utils.path import list_to_path
          p = list_to_path(["a", "b"])
          self.assertEqual(p, "a:b")
  
          p = list_to_path(["a"])
          self.assertEqual(p, "a")
  
          p = list_to_path([""])
          self.assertEqual(p, "")
  
subject: add tests