added failure test for deleted likes

app/helpers/notifications_helper.rb

@@ -24,7 +24,11 @@ module NotificationsHelper
       end
     elsif note.instance_of?(Notifications::Liked)
       post = note.target
-      "#{translation(target_type, post.author.name)} #{link_to t('notifications.post'), status_message_path(post), 'data-ref' => post.id, :class => 'hard_object_link'}".html_safe
+      if post
+        "#{translation(target_type, post.author.name)} #{link_to t('notifications.post'), status_message_path(post), 'data-ref' => post.id, :class => 'hard_object_link'}".html_safe
+      else
+        t('notifications.liked_post_deleted')
+      end
     else #Notifications:StartedSharing, etc.
       translation(target_type)
     end

config/locales/diaspora/en.yml

@@ -299,6 +299,7 @@ en:
     post: "post."
     deleted: "deleted"
     also_commented_deleted: "commented on a deleted post."
+    liked_post_deleted: "liked your deleted post."
     index:
       notifications: "Notifications"
       mark_all_as_read: "Mark All as Read"

spec/helpers/notifications_helper_spec.rb

@@ -33,6 +33,18 @@ describe NotificationsHelper do
         output = object_link(@notification)
         output.should include t("#{@notification.popup_translation_key}")
       end
+
+      context 'when post is deleted' do
+        it 'works' do
+          @post.destroy
+          expect{ object_link(@notification)}.should_not raise_error
+        end
+
+        it 'displays that the post was deleted' do
+          @post.destroy
+          object_link(@notification).should == t('notifications.liked_post_deleted')
+        end
+      end
     end
   end
 end