Add support for itunes episode & season

lib/rss/itunes.rb

@@ -259,7 +259,12 @@ def append_features(klass)
     end
 
     ELEMENT_INFOS = ITunesBaseModel::ELEMENT_INFOS +
-      [["duration", :element, "content"], ["image", :attribute, "href"]]
+      [
+        ["duration", :element, "content"],
+        ["image", :attribute, "href"],
+        ["season", :positive_integer],
+        ["episode", :positive_integer],
+      ]
 
     class ITunesImage < Element
       include RSS09

test/test-itunes.rb

@@ -105,6 +105,18 @@ def test_summary
       end
     end
 
+    def test_season
+      assert_itunes_season(%w(items last)) do |content, xmlns|
+         make_rss20(make_channel20(make_item20(content)), xmlns)
+      end
+    end
+
+    def test_episode
+      assert_itunes_episode(%w(items last)) do |content, xmlns|
+         make_rss20(make_channel20(make_item20(content)), xmlns)
+      end
+    end
+
     private
     def itunes_rss20_parse(content, &maker)
       xmlns = {"itunes" => "http://www.itunes.com/dtds/podcast-1.0.dtd"}
@@ -353,6 +365,38 @@ def assert_itunes_subtitle(readers, &rss20_maker)
       end
     end
 
+    def set_itunes_season(season, readers, &rss20_maker)
+       content = tag("itunes:season", season)
+       rss20 = itunes_rss20_parse(content, &rss20_maker)
+       target = chain_reader(rss20, readers)
+       target.itunes_season
+    end
+
+    def assert_itunes_season(readers, &rss20_maker)
+      _wrap_assertion do
+        assert_equal(1, set_itunes_season("1", readers, &rss20_maker))
+        assert_raise(NotAvailableValueError.new("season", "0")) do
+          set_itunes_season("0", readers, &rss20_maker)
+        end
+      end
+    end
+
+    def set_itunes_episode(episode, readers, &rss20_maker)
+      content = tag("itunes:episode", episode)
+      rss20 = itunes_rss20_parse(content, &rss20_maker)
+      target = chain_reader(rss20, readers)
+      target.itunes_episode
+    end
+
+    def assert_itunes_episode(readers, &rss20_maker)
+      _wrap_assertion do
+        assert_equal(1, set_itunes_episode("1", readers, &rss20_maker))
+        assert_raise(NotAvailableValueError.new("episode", "0")) do
+          set_itunes_episode("0", readers, &rss20_maker)
+        end
+      end
+    end
+
     def _assert_itunes_summary(value, readers, &rss20_maker)
       content = tag("itunes:summary", value)
       rss20 = itunes_rss20_parse(content, &rss20_maker)