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diff --git a/test/web/activity_pub/transmogrifier/accept_handling_test.exs b/test/web/activity_pub/transmogrifier/accept_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.AcceptHandlingTest do
+  use Pleroma.DataCase
+
+  alias Pleroma.User
+  alias Pleroma.Web.ActivityPub.Transmogrifier
+  alias Pleroma.Web.CommonAPI
+
+  import Pleroma.Factory
+
+  test "it works for incoming accepts which were pre-accepted" do
+    follower = insert(:user)
+    followed = insert(:user)
+
+    {:ok, follower} = User.follow(follower, followed)
+    assert User.following?(follower, followed) == true
+
+    {:ok, _, _, follow_activity} = CommonAPI.follow(follower, followed)
+
+    accept_data =
+      File.read!("test/fixtures/mastodon-accept-activity.json")
+      |> Poison.decode!()
+      |> Map.put("actor", followed.ap_id)
+
+    object =
+      accept_data["object"]
+      |> Map.put("actor", follower.ap_id)
+      |> Map.put("id", follow_activity.data["id"])
+
+    accept_data = Map.put(accept_data, "object", object)
+
+    {:ok, activity} = Transmogrifier.handle_incoming(accept_data)
+    refute activity.local
+
+    assert activity.data["object"] == follow_activity.data["id"]
+
+    assert activity.data["id"] == accept_data["id"]
+
+    follower = User.get_cached_by_id(follower.id)
+
+    assert User.following?(follower, followed) == true
+  end
+
+  test "it works for incoming accepts which were orphaned" do
+    follower = insert(:user)
+    followed = insert(:user, locked: true)
+
+    {:ok, _, _, follow_activity} = CommonAPI.follow(follower, followed)
+
+    accept_data =
+      File.read!("test/fixtures/mastodon-accept-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))
+
+    {:ok, activity} = Transmogrifier.handle_incoming(accept_data)
+    assert activity.data["object"] == follow_activity.data["id"]
+
+    follower = User.get_cached_by_id(follower.id)
+
+    assert User.following?(follower, followed) == true
+  end
+
+  test "it works for incoming accepts which are referenced by IRI only" do
+    follower = insert(:user)
+    followed = insert(:user, locked: true)
+
+    {:ok, _, _, follow_activity} = CommonAPI.follow(follower, followed)
+
+    accept_data =
+      File.read!("test/fixtures/mastodon-accept-activity.json")
+      |> Poison.decode!()
+      |> Map.put("actor", followed.ap_id)
+      |> Map.put("object", follow_activity.data["id"])
+
+    {:ok, activity} = Transmogrifier.handle_incoming(accept_data)
+    assert activity.data["object"] == follow_activity.data["id"]
+
+    follower = User.get_cached_by_id(follower.id)
+
+    assert User.following?(follower, followed) == true
+
+    follower = User.get_by_id(follower.id)
+    assert follower.following_count == 1
+
+    followed = User.get_by_id(followed.id)
+    assert followed.follower_count == 1
+  end
+
+  test "it fails for incoming accepts which cannot be correlated" do
+    follower = insert(:user)
+    followed = insert(:user, locked: true)
+
+    accept_data =
+      File.read!("test/fixtures/mastodon-accept-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
+end