def test_empty_strings_returns_zero(self):
     a = ""
     b = ""
     result = dissimilarity(a, b)
     self.assertEqual(result, 0)
 def test_two_different_chars_return_two(self):
     a = "a"
     b = "b"
     result = dissimilarity(a, b)
     self.assertEqual(result, 2)
 def test_two_of_differing_lengths(self):
     a = "a"
     b = "aa"
     result = dissimilarity(a, b)
     self.assertEqual(result, 1)
 def test_one_char_returns_one(self):
     a = "a"
     b = ""
     result = dissimilarity(a, b)
     self.assertEqual(result, 1)
 def test_two_similar_chars_give_zero(self):
     a = "a"
     b = "a"
     result = dissimilarity(a, b)
     self.assertEqual(result, 0)
 def test_empty_strings_returns_zero(self):
     a = ""
     b = ""
     result = dissimilarity(a, b)
     self.assertEqual(result, 0)
 def test_two_of_differing_lengths(self):
     a = "a"
     b = "aa"
     result = dissimilarity(a, b)
     self.assertEqual(result, 1)
 def test_two_different_chars_return_two(self):
     a = "a"
     b = "b"
     result = dissimilarity(a, b)
     self.assertEqual(result, 2)
 def test_two_similar_chars_give_zero(self):
     a = "a"
     b = "a"
     result = dissimilarity(a, b)
     self.assertEqual(result, 0)
 def test_one_char_returns_one(self):
     a = "a"
     b = ""
     result = dissimilarity(a, b)
     self.assertEqual(result, 1)