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diff --git a/test/pleroma/web/activity_pub/transmogrifier/reject_handling_test.exs b/test/pleroma/web/activity_pub/transmogrifier/reject_handling_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.Transmogrifier.RejectHandlingTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.Activity
+  alias Pleroma.User
+  alias Pleroma.Web.ActivityPub.Transmogrifier
+  alias Pleroma.Web.CommonAPI
+
+  import Pleroma.Factory
+
+  test "it fails for incoming rejects which cannot be correlated" do
+    follower = insert(:user)
+    followed = insert(:user, is_locked: true)
+
+    accept_data =
+      File.read!("test/fixtures/mastodon-reject-activity.json")
+      |> Poison.decode!()
+      |> Map.put("actor", followed.ap_id)
+
+    accept_data =
+      Map.put(accept_data, "object", Map.put(accept_data["object"], "actor", follower.ap_id))
+
+    {:error, _} = Transmogrifier.handle_incoming(accept_data)
+
+    follower = User.get_cached_by_id(follower.id)
+
+    refute User.following?(follower, followed) == true
+  end
+
+  test "it works for incoming rejects which are referenced by IRI only" do
+    follower = insert(:user)
+    followed = insert(:user, is_locked: true)
+
+    {:ok, follower} = User.follow(follower, followed)
+    {:ok, _, _, follow_activity} = CommonAPI.follow(follower, followed)
+
+    assert User.following?(follower, followed) == true
+
+    reject_data =
+      File.read!("test/fixtures/mastodon-reject-activity.json")
+      |> Poison.decode!()
+      |> Map.put("actor", followed.ap_id)
+      |> Map.put("object", follow_activity.data["id"])
+
+    {:ok, %Activity{data: _}} = Transmogrifier.handle_incoming(reject_data)
+
+    follower = User.get_cached_by_id(follower.id)
+
+    assert User.following?(follower, followed) == false
+  end
+
+  test "it rejects activities without a valid ID" do
+    user = insert(:user)
+
+    data =
+      File.read!("test/fixtures/mastodon-follow-activity.json")
+      |> Poison.decode!()
+      |> Map.put("object", user.ap_id)
+      |> Map.put("id", "")
+
+    :error = Transmogrifier.handle_incoming(data)
+  end
+end