spec: checking for excerpt should ask for XML node's content

Author: parkr

spec/jekyll-feed_spec.rb

@@ -105,7 +105,7 @@
 
     it "includes the item's excerpt" do
       post = feed.items.last
-      expect(post.summary).to eql("Foo")
+      expect(post.summary.content).to eql("Foo")
     end
 
     it "doesn't include the item's excerpt if blank" do