def test_4(self):
first_word = "Levenshtien"
second_word = "Frankenstein"
result = d_l_distance(first_word, second_word)
expected = 7
self.assertEqual(expected, result)
def test_0_empty(self):
first_word = ""
second_word = ""
result = d_l_distance(first_word, second_word)
expected = 0
self.assertEqual(expected, result)
def test_3(self):
first_word = "ab"
second_word = "aabs"
result = d_l_distance(first_word, second_word)
expected = 2
self.assertEqual(expected, result)
