hamming: updated tests to v2.2.0

Updated hamming test cases to v2.2.0. Fixes exercism#1621

exercises/hamming/hamming_test.py

@@ -3,47 +3,23 @@
 import hamming
 
 
-# Tests adapted from `problem-specifications//canonical-data.json` @ v2.1.1
+# Tests adapted from `problem-specifications//canonical-data.json` @ v2.2.0
 
 class HammingTest(unittest.TestCase):
 
     def test_empty_strands(self):
         self.assertEqual(hamming.distance("", ""), 0)
 
-    def test_identical_strands(self):
+    def test_single_letter_identical_strands(self):
         self.assertEqual(hamming.distance("A", "A"), 0)
+
+    def test_single_letter_different_strands(self):
+        self.assertEqual(hamming.distance("G", "T"), 1)
 
     def test_long_identical_strands(self):
-        self.assertEqual(hamming.distance("GGACTGA", "GGACTGA"), 0)
-
-    def test_complete_distance_in_single_nucleotide_strands(self):
-        self.assertEqual(hamming.distance("A", "G"), 1)
-
-    def test_complete_distance_in_small_strands(self):
-        self.assertEqual(hamming.distance("AG", "CT"), 2)
-
-    def test_small_distance_in_small_strands(self):
-        self.assertEqual(hamming.distance("AT", "CT"), 1)
-
-    def test_small_distance(self):
-        self.assertEqual(hamming.distance("GGACG", "GGTCG"), 1)
-
-    def test_small_distance_in_long_strands(self):
-        self.assertEqual(hamming.distance("ACCAGGG", "ACTATGG"), 2)
-
-    def test_non_unique_character_in_first_strand(self):
-        self.assertEqual(hamming.distance("AAG", "AAA"), 1)
-
-    def test_non_unique_character_in_second_strand(self):
-        self.assertEqual(hamming.distance("AAA", "AAG"), 1)
-
-    def test_same_nucleotides_in_different_positions(self):
-        self.assertEqual(hamming.distance("TAG", "GAT"), 2)
-
-    def test_large_distance(self):
-        self.assertEqual(hamming.distance("GATACA", "GCATAA"), 4)
-
-    def test_large_distance_in_off_by_one_strand(self):
+        self.assertEqual(hamming.distance("GGACTGAAATCTG", "GGACTGAAATCTG"), 0)
+
+    def test_long_different_strands(self):
         self.assertEqual(hamming.distance("GGACGGATTCTG", "AGGACGGATTCT"), 9)
 
     def test_disallow_first_strand_longer(self):