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diff --git a/test/pleroma/web/activity_pub/mrf/utils_test.exs b/test/pleroma/web/activity_pub/mrf/utils_test.exs
new file mode 100644
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+++ b/test/pleroma/web/activity_pub/mrf/utils_test.exs
@@ -0,0 +1,19 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2023 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.UtilsTest do
+  use Pleroma.DataCase, async: true
+
+  alias Pleroma.Web.ActivityPub.MRF.Utils
+
+  describe "describe_regex_or_string/1" do
+    test "describes regex" do
+      assert "~r/foo/i" == Utils.describe_regex_or_string(~r/foo/i)
+    end
+
+    test "returns string as-is" do
+      assert "foo" == Utils.describe_regex_or_string("foo")
+    end
+  end
+end