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diff --git a/test/pleroma/web/activity_pub/mrf/ensure_re_prepended_test.exs b/test/pleroma/web/activity_pub/mrf/ensure_re_prepended_test.exs
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+++ b/test/pleroma/web/activity_pub/mrf/ensure_re_prepended_test.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.ActivityPub.MRF.EnsureRePrependedTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Activity
+  alias Pleroma.Object
+  alias Pleroma.Web.ActivityPub.MRF.EnsureRePrepended
+
+  describe "rewrites summary" do
+    test "it adds `re:` to summary object when child summary and parent summary equal" do
+      message = %{
+        "type" => "Create",
+        "object" => %{
+          "summary" => "object-summary",
+          "inReplyTo" => %Activity{object: %Object{data: %{"summary" => "object-summary"}}}
+        }
+      }
+
+      assert {:ok, res} = EnsureRePrepended.filter(message)
+      assert res["object"]["summary"] == "re: object-summary"
+    end
+
+    test "it adds `re:` to summary object when child summary containts re-subject of parent summary " do
+      message = %{
+        "type" => "Create",
+        "object" => %{
+          "summary" => "object-summary",
+          "inReplyTo" => %Activity{object: %Object{data: %{"summary" => "re: object-summary"}}}
+        }
+      }
+
+      assert {:ok, res} = EnsureRePrepended.filter(message)
+      assert res["object"]["summary"] == "re: object-summary"
+    end
+  end
+
+  describe "skip filter" do
+    test "it skip if type isn't 'Create'" do
+      message = %{
+        "type" => "Annotation",
+        "object" => %{"summary" => "object-summary"}
+      }
+
+      assert {:ok, res} = EnsureRePrepended.filter(message)
+      assert res == message
+    end
+
+    test "it skip if summary is empty" do
+      message = %{
+        "type" => "Create",
+        "object" => %{
+          "inReplyTo" => %Activity{object: %Object{data: %{"summary" => "summary"}}}
+        }
+      }
+
+      assert {:ok, res} = EnsureRePrepended.filter(message)
+      assert res == message
+    end
+
+    test "it skip if inReplyTo is empty" do
+      message = %{"type" => "Create", "object" => %{"summary" => "summary"}}
+      assert {:ok, res} = EnsureRePrepended.filter(message)
+      assert res == message
+    end
+
+    test "it skip if parent and child summary isn't equal" do
+      message = %{
+        "type" => "Create",
+        "object" => %{
+          "summary" => "object-summary",
+          "inReplyTo" => %Activity{object: %Object{data: %{"summary" => "summary"}}}
+        }
+      }
+
+      assert {:ok, res} = EnsureRePrepended.filter(message)
+      assert res == message
+    end
+
+    test "it skips if the object is only a reference" do
+      message = %{
+        "type" => "Create",
+        "object" => "somereference"
+      }
+
+      assert {:ok, res} = EnsureRePrepended.filter(message)
+      assert res == message
+    end
+  end
+end