ChatMessage: Correctly ingest emoji tags.

test/fixtures/create-chat-message.json

@@ -9,6 +9,18 @@
     "to": [
       "http://2hu.gensokyo/users/marisa"
     ],
+    "tag": [
+      {
+        "icon": {
+          "type": "Image",
+          "url": "http://2hu.gensokyo/emoji/Firefox.gif"
+        },
+        "id": "http://2hu.gensokyo/emoji/Firefox.gif",
+        "name": ":firefox:",
+        "type": "Emoji",
+        "updated": "1970-01-01T00:00:00Z"
+      }
+    ],
     "type": "ChatMessage"
   },
   "published": "2018-02-12T14:08:20Z",

test/web/activity_pub/transmogrifier/chat_message_test.exs

@@ -75,6 +75,7 @@ defmodule Pleroma.Web.ActivityPub.Transmogrifier.ChatMessageTest do
 
       assert object
       assert object.data["content"] == "You expected a cute girl? Too bad. alert('XSS')"
+      assert match?(%{"firefox" => _}, object.data["emoji"])
 
       refute Chat.get(author.id, recipient.ap_id)
       assert Chat.get(recipient.id, author.ap_id)