added test helpers to clear config after tests

test/web/rich_media/helpers_test.exs

@@ -15,12 +15,12 @@ defmodule Pleroma.Web.RichMedia.HelpersTest do
 
   setup do
     mock(fn env -> apply(HttpRequestMock, :request, [env]) end)
-    rich_media = Config.get([:rich_media, :enabled])
-    on_exit(fn -> Config.put([:rich_media, :enabled], rich_media) end)
 
     :ok
   end
 
+  clear_config([:rich_media, :enabled])
+
   test "refuses to crawl incomplete URLs" do
     user = insert(:user)