new_contents: import unittest
  
  from bento.commands.script_utils \
      import \
          nt_quote_arg
  
  class TestMisc(unittest.TestCase):
      def test_nt_quote_arg(self):
          s = nt_quote_arg("foo")
          self.assertEqual(s, "foo")
  
          s = nt_quote_arg(" foo")
          self.assertEqual(s, '" foo"')
  
          s = nt_quote_arg("\ foo")
          self.assertEqual(s, '"\\ foo"')
  
subject: add simple test for nt_quote_args.