isogram: update tests to version 1.2.0 (#1032)

* isogram: update tests to version 1.2.0 (#1016)

* isogram: Ref problem-specification in test case

exercises/isogram/isogram_test.py

@@ -3,7 +3,7 @@
 from isogram import is_isogram
 
 
-# test cases adapted from `x-common//canonical-data.json` @ version: 1.1.0
+# Tests adapted from `problem-specifications//canonical-data.json` @ v1.2.0
 
 class TestIsogram(unittest.TestCase):
 
@@ -25,15 +25,17 @@ def test_word_with_duplicated_character_in_mixed_case(self):
     def test_hypothetical_isogrammic_word_with_hyphen(self):
         self.assertIs(is_isogram("thumbscrew-japingly"), True)
 
-    def test_isogram_with_duplicated_non_letter_character(self):
-        self.assertIs(is_isogram("Hjelmqvist-Gryb-Zock-Pfund-Wax"), True)
+    def test_isogram_with_duplicated_hyphen(self):
+        self.assertIs(is_isogram("six-year-old"), True)
 
     def test_made_up_name_that_is_an_isogram(self):
         self.assertIs(is_isogram("Emily Jung Schwartzkopf"), True)
 
     def test_duplicated_character_in_the_middle(self):
         self.assertIs(is_isogram("accentor"), False)
 
+    # Additional tests for this track
+
     def test_isogram_with_duplicated_letter_and_nonletter_character(self):
         self.assertIs(is_isogram("Aleph Bot Chap"), False)