Using the term 'modern ruby'

src/about_strings.rb

@@ -151,7 +151,7 @@ EOS
   end
 
   in_ruby_version("1.8") do
-    def test_in_ruby_1_8_single_characters_are_represented_by_integers
+    def test_in_older_ruby_single_characters_are_represented_by_integers
       assert_equal __(97, 'a'), ?a
       assert_equal __(true, false), ?a == 97
 
@@ -160,7 +160,7 @@ EOS
   end
 
   in_ruby_version("1.9", "2") do
-    def test_in_ruby_1_9_and_2_single_characters_are_represented_by_strings
+    def test_in_modern_ruby_single_characters_are_represented_by_strings
       assert_equal __('a'), ?a
       assert_equal __(false), ?a == 97
     end