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diff --git a/test/pleroma/web/activity_pub/mrf/quiet_reply_test.exs b/test/pleroma/web/activity_pub/mrf/quiet_reply_test.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.QuietReplyTest do
+  use Pleroma.DataCase
+  import Pleroma.Factory
+
+  require Pleroma.Constants
+
+  alias Pleroma.Object
+  alias Pleroma.Web.ActivityPub.MRF.QuietReply
+  alias Pleroma.Web.CommonAPI
+
+  test "replying to public post is forced to be quiet" do
+    batman = insert(:user, nickname: "batman")
+    robin = insert(:user, nickname: "robin")
+
+    {:ok, post} = CommonAPI.post(batman, %{status: "To the Batmobile!"})
+
+    reply = %{
+      "type" => "Create",
+      "actor" => robin.ap_id,
+      "to" => [
+        batman.ap_id,
+        Pleroma.Constants.as_public()
+      ],
+      "cc" => [robin.follower_address],
+      "object" => %{
+        "type" => "Note",
+        "actor" => robin.ap_id,
+        "content" => "@batman Wait up, I forgot my spandex!",
+        "to" => [
+          batman.ap_id,
+          Pleroma.Constants.as_public()
+        ],
+        "cc" => [robin.follower_address],
+        "inReplyTo" => Object.normalize(post).data["id"]
+      }
+    }
+
+    expected_to = [batman.ap_id, robin.follower_address]
+    expected_cc = [Pleroma.Constants.as_public()]
+
+    assert {:ok, filtered} = QuietReply.filter(reply)
+
+    assert expected_to == filtered["to"]
+    assert expected_cc == filtered["cc"]
+    assert expected_to == filtered["object"]["to"]
+    assert expected_cc == filtered["object"]["cc"]
+  end
+
+  test "replying direct is unmodified" do
+    batman = insert(:user, nickname: "batman")
+    robin = insert(:user, nickname: "robin")
+
+    {:ok, post} = CommonAPI.post(batman, %{status: "To the Batmobile!"})
+
+    reply = %{
+      "type" => "Create",
+      "actor" => robin.ap_id,
+      "to" => [batman.ap_id],
+      "cc" => [],
+      "object" => %{
+        "type" => "Note",
+        "actor" => robin.ap_id,
+        "content" => "@batman Wait up, I forgot my spandex!",
+        "to" => [batman.ap_id],
+        "cc" => [],
+        "inReplyTo" => Object.normalize(post).data["id"]
+      }
+    }
+
+    assert {:ok, filtered} = QuietReply.filter(reply)
+
+    assert match?(^filtered, reply)
+  end
+
+  test "replying followers-only is unmodified" do
+    batman = insert(:user, nickname: "batman")
+    robin = insert(:user, nickname: "robin")
+
+    {:ok, post} = CommonAPI.post(batman, %{status: "To the Batmobile!"})
+
+    reply = %{
+      "type" => "Create",
+      "actor" => robin.ap_id,
+      "to" => [batman.ap_id, robin.follower_address],
+      "cc" => [],
+      "object" => %{
+        "type" => "Note",
+        "actor" => robin.ap_id,
+        "content" => "@batman Wait up, I forgot my spandex!",
+        "to" => [batman.ap_id, robin.follower_address],
+        "cc" => [],
+        "inReplyTo" => Object.normalize(post).data["id"]
+      }
+    }
+
+    assert {:ok, filtered} = QuietReply.filter(reply)
+
+    assert match?(^filtered, reply)
+  end
+
+  test "non-reply posts are unmodified" do
+    batman = insert(:user, nickname: "batman")
+
+    {:ok, post} = CommonAPI.post(batman, %{status: "To the Batmobile!"})
+
+    assert {:ok, filtered} = QuietReply.filter(post)
+
+    assert match?(^filtered, post)
+  end
+end