text: import unittest
  
  from .. import zanza
  
  
  class ZanzaTests(unittest.TestCase):
  
      def test_empty_string(self):
          """Zanza with empty string.
          """
  
          with self.assertRaises(ValueError):
              zanza("")
  
      def test_ok(self):
          """Zanza with valid input.
          """
  
          res = zanza("foobarbaz")
          expected = [[1, 0, 2], 9, 0, -13, -1, 17, -16, -1, 25]
          self.assertEqual(res, expected)
  