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diff --git a/test/pleroma/web/activity_pub/mrf/force_mentions_in_content_test.exs b/test/pleroma/web/activity_pub/mrf/force_mentions_in_content_test.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.ForceMentionsInContentTest do
+  alias Pleroma.Web.ActivityPub.MRF.ForceMentionsInContent
+  import Pleroma.Factory
+  use Pleroma.DataCase
+
+  test "adds mentions to post content" do
+    users = %{
+      "lain@lain.com" => "https://lain.com/users/lain",
+      "coolboymew@shitposter.club" => "https://shitposter.club/users/coolboymew",
+      "dielan@shitposter.club" => "https://shitposter.club/users/dielan",
+      "hakui@tuusin.misono-ya.info" => "https://tuusin.misono-ya.info/users/hakui",
+      "fence@xyzzy.link" => "https://xyzzy.link/users/fence"
+    }
+
+    Enum.each(users, fn {nickname, ap_id} ->
+      insert(:user, ap_id: ap_id, nickname: nickname, local: false)
+    end)
+
+    object = File.read!("test/fixtures/soapbox_no_mentions_in_content.json") |> Jason.decode!()
+
+    activity = %{
+      "type" => "Create",
+      "actor" => "https://gleasonator.com/users/alex",
+      "object" => object
+    }
+
+    {:ok, %{"object" => %{"content" => filtered}}} = ForceMentionsInContent.filter(activity)
+    Enum.each(users, fn {nickname, _} -> assert filtered =~ nickname end)
+  end
+end