Add categories to ostatus output.

test/support/factory.ex

@@ -25,7 +25,8 @@ defmodule Pleroma.Factory do
       "published_at" => DateTime.utc_now() |> DateTime.to_iso8601,
       "likes" => [],
       "like_count" => 0,
-      "context" => "2hu"
+      "context" => "2hu",
+      "tag" => ["2hu"]
     }
 
     %Pleroma.Object{

test/web/ostatus/activity_representer_test.exs

@@ -27,6 +27,7 @@ defmodule Pleroma.Web.OStatus.ActivityRepresenterTest do
     <ostatus:conversation>#{note_activity.data["context"]}</ostatus:conversation>
     <link href="#{note_activity.data["context"]}" rel="ostatus:conversation" />
     <link type="application/atom+xml" href="#{note_activity.data["object"]["id"]}" rel="self" />
+    <category term="2hu"/>
     <link rel="mentioned" ostatus:object-type="http://activitystrea.ms/schema/1.0/collection" href="http://activityschema.org/collection/public"/>
     """