Transmogrifier: Make proper use of the LikeValidator.

test/web/activity_pub/object_validator_test.exs

@@ -13,6 +13,8 @@ defmodule Pleroma.Web.ActivityPub.ObjectValidatorTest do
       {:ok, post_activity} = CommonAPI.post(user, %{"status" => "uguu"})
 
       valid_like = %{
+        "to" => [user.ap_id],
+        "cc" => [],
         "type" => "Like",
         "id" => Utils.generate_activity_id(),
         "object" => post_activity.data["object"],

test/web/activity_pub/transmogrifier_test.exs

@@ -333,7 +333,9 @@ defmodule Pleroma.Web.ActivityPub.TransmogrifierTest do
         |> Poison.decode!()
         |> Map.put("object", activity.data["object"])
 
-      {:ok, %Activity{data: data, local: false}} = Transmogrifier.handle_incoming(data)
+      {:ok, %Activity{data: data, local: false} = activity} = Transmogrifier.handle_incoming(data)
+
+      refute Enum.empty?(activity.recipients)
 
       assert data["actor"] == "http://mastodon.example.org/users/admin"
       assert data["type"] == "Like"