added test to verify truncating

spec/meta_tags_spec.rb

@@ -176,6 +176,10 @@
     it 'should strip HTML' do
       @view.display_meta_tags(:site => 'someSite', :description => "<p>some <b>description</b></p>").should include('<meta content="some description" name="description" />')
     end
+
+    it 'should truncate correctly' do
+      @view.display_meta_tags(:site => 'someSite', :description => "Lorem ipsum dolor sit amet, consectetuer sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.").should include('<meta content="Lorem ipsum dolor sit amet, consectetuer sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dol..." name="description" />')
+    end
   end
 
   context 'displaying keywords' do