update pangram tests

fixes exercism#1018

exercises/pangram/pangram_test.py

@@ -3,12 +3,17 @@
 from pangram import is_pangram
 
 
-# test cases adapted from `x-common//canonical-data.json` @ version: 1.0.0
+# test cases adapted from `x-common//canonical-data.json` @ version: 1.3.0
 
 class PangramTests(unittest.TestCase):
     def test_sentence_empty(self):
         self.assertIs(is_pangram(''), False)
 
+    def test_pangram_with_perfect_lower_case(self):
+        self.assertIs(
+            is_pangram('abcdefghijklmnopqrstuvwxyz'),
+            True)
+
     def test_pangram_with_only_lower_case(self):
         self.assertIs(
             is_pangram('the quick brown fox jumps over the lazy dog'),
@@ -20,9 +25,9 @@ def test_missing_character_x(self):
                        'jeopardize five gunboats'),
             False)
 
-    def test_another_missing_character_x(self):
+    def test_another_missing_character_h(self):
         self.assertIs(
-            is_pangram('the quick brown fish jumps over the lazy dog'),
+            is_pangram('five boxing wizards jump quickly at it'),
             False)
 
     def test_pangram_with_underscores(self):
@@ -47,7 +52,7 @@ def test_pangram_with_mixedcase_and_punctuation(self):
 
     def test_upper_and_lower_case_versions_of_the_same_character(self):
         self.assertIs(
-            is_pangram('the quick brown fox jumped over the lazy FOX'),
+            is_pangram('the quick brown fox jumps over with lazy FX'),
             False)