def test_case_6(self):
word1 = 'dinitrophenylhydrazine'
word2 = 'benzalphenylhydrazone'
e = EditDistance()
result = e.calculateNumberOfChanges(word1, word2)
self.assertEqual(result, 7)
def test_case_1(self):
word1 = 'abcd'
word2 = 'abdd'
e = EditDistance()
result = e.calculateNumberOfChanges(word1, word2)
self.assertEqual(result, 1)
def test_case_5(self):
word1 = 'intention'
word2 = 'execution'
e = EditDistance()
result = e.calculateNumberOfChanges(word1, word2)
self.assertEqual(result, 5)