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diff --git a/test/web/fed_sockets/fed_registry_test.exs b/test/web/fed_sockets/fed_registry_test.exs
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+++ b/test/web/fed_sockets/fed_registry_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.FedSockets.FedRegistryTest do
+  use ExUnit.Case
+
+  alias Pleroma.Web.FedSockets
+  alias Pleroma.Web.FedSockets.FedRegistry
+  alias Pleroma.Web.FedSockets.SocketInfo
+
+  @good_domain "http://good.domain"
+  @good_domain_origin "good.domain:80"
+
+  setup do
+    start_supervised({Pleroma.Web.FedSockets.Supervisor, []})
+    build_test_socket(@good_domain)
+    Process.sleep(10)
+
+    :ok
+  end
+
+  describe "add_fed_socket/1 without conflicting sockets" do
+    test "can be added" do
+      Process.sleep(10)
+      assert {:ok, %SocketInfo{origin: origin}} = FedRegistry.get_fed_socket(@good_domain_origin)
+      assert origin == "good.domain:80"
+    end
+
+    test "multiple origins can be added" do
+      build_test_socket("http://anothergood.domain")
+      Process.sleep(10)
+
+      assert {:ok, %SocketInfo{origin: origin_1}} =
+               FedRegistry.get_fed_socket(@good_domain_origin)
+
+      assert {:ok, %SocketInfo{origin: origin_2}} =
+               FedRegistry.get_fed_socket("anothergood.domain:80")
+
+      assert origin_1 == "good.domain:80"
+      assert origin_2 == "anothergood.domain:80"
+      assert FedRegistry.list_all() |> Enum.count() == 2
+    end
+  end
+
+  describe "add_fed_socket/1 when duplicate sockets conflict" do
+    setup do
+      build_test_socket(@good_domain)
+      build_test_socket(@good_domain)
+      Process.sleep(10)
+      :ok
+    end
+
+    test "will be ignored" do
+      assert {:ok, %SocketInfo{origin: origin, pid: pid_one}} =
+               FedRegistry.get_fed_socket(@good_domain_origin)
+
+      assert origin == "good.domain:80"
+
+      assert FedRegistry.list_all() |> Enum.count() == 1
+    end
+
+    test "the newer process will be closed" do
+      pid_two = build_test_socket(@good_domain)
+
+      assert {:ok, %SocketInfo{origin: origin, pid: pid_one}} =
+               FedRegistry.get_fed_socket(@good_domain_origin)
+
+      assert origin == "good.domain:80"
+      Process.sleep(10)
+
+      refute Process.alive?(pid_two)
+
+      assert FedRegistry.list_all() |> Enum.count() == 1
+    end
+  end
+
+  describe "get_fed_socket/1" do
+    test "returns missing for unknown hosts" do
+      assert {:error, :missing} = FedRegistry.get_fed_socket("not_a_dmoain")
+    end
+
+    test "returns rejected for hosts previously rejected" do
+      "rejected.domain:80"
+      |> FedSockets.uri_for_origin()
+      |> FedRegistry.set_host_rejected()
+
+      assert {:error, :rejected} = FedRegistry.get_fed_socket("rejected.domain:80")
+    end
+
+    test "can retrieve a previously added SocketInfo" do
+      build_test_socket(@good_domain)
+      Process.sleep(10)
+      assert {:ok, %SocketInfo{origin: origin}} = FedRegistry.get_fed_socket(@good_domain_origin)
+      assert origin == "good.domain:80"
+    end
+
+    test "removes references to SocketInfos when the process crashes" do
+      assert {:ok, %SocketInfo{origin: origin, pid: pid}} =
+               FedRegistry.get_fed_socket(@good_domain_origin)
+
+      assert origin == "good.domain:80"
+
+      Process.exit(pid, :testing)
+      Process.sleep(100)
+      assert {:error, :missing} = FedRegistry.get_fed_socket(@good_domain_origin)
+    end
+  end
+
+  def build_test_socket(uri) do
+    Kernel.spawn(fn -> fed_socket_almost(uri) end)
+  end
+
+  def fed_socket_almost(origin) do
+    FedRegistry.add_fed_socket(origin)
+
+    receive do
+      :close ->
+        :ok
+    after
+      5_000 -> :timeout
+    end
+  end
+end