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diff --git a/test/pleroma/web/plugs/remote_ip_test.exs b/test/pleroma/web/plugs/remote_ip_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.Plugs.RemoteIpTest do
+  use ExUnit.Case
+  use Plug.Test
+
+  alias Pleroma.Web.Plugs.RemoteIp
+
+  import Pleroma.Tests.Helpers, only: [clear_config: 2]
+
+  setup do:
+          clear_config(RemoteIp,
+            enabled: true,
+            headers: ["x-forwarded-for"],
+            proxies: [],
+            reserved: [
+              "127.0.0.0/8",
+              "::1/128",
+              "fc00::/7",
+              "10.0.0.0/8",
+              "172.16.0.0/12",
+              "192.168.0.0/16"
+            ]
+          )
+
+  test "disabled" do
+    Pleroma.Config.put(RemoteIp, enabled: false)
+
+    %{remote_ip: remote_ip} = conn(:get, "/")
+
+    conn =
+      conn(:get, "/")
+      |> put_req_header("x-forwarded-for", "1.1.1.1")
+      |> RemoteIp.call(nil)
+
+    assert conn.remote_ip == remote_ip
+  end
+
+  test "enabled" do
+    conn =
+      conn(:get, "/")
+      |> put_req_header("x-forwarded-for", "1.1.1.1")
+      |> RemoteIp.call(nil)
+
+    assert conn.remote_ip == {1, 1, 1, 1}
+  end
+
+  test "custom headers" do
+    Pleroma.Config.put(RemoteIp, enabled: true, headers: ["cf-connecting-ip"])
+
+    conn =
+      conn(:get, "/")
+      |> put_req_header("x-forwarded-for", "1.1.1.1")
+      |> RemoteIp.call(nil)
+
+    refute conn.remote_ip == {1, 1, 1, 1}
+
+    conn =
+      conn(:get, "/")
+      |> put_req_header("cf-connecting-ip", "1.1.1.1")
+      |> RemoteIp.call(nil)
+
+    assert conn.remote_ip == {1, 1, 1, 1}
+  end
+
+  test "custom proxies" do
+    conn =
+      conn(:get, "/")
+      |> put_req_header("x-forwarded-for", "173.245.48.1, 1.1.1.1, 173.245.48.2")
+      |> RemoteIp.call(nil)
+
+    refute conn.remote_ip == {1, 1, 1, 1}
+
+    Pleroma.Config.put([RemoteIp, :proxies], ["173.245.48.0/20"])
+
+    conn =
+      conn(:get, "/")
+      |> put_req_header("x-forwarded-for", "173.245.48.1, 1.1.1.1, 173.245.48.2")
+      |> RemoteIp.call(nil)
+
+    assert conn.remote_ip == {1, 1, 1, 1}
+  end
+
+  test "proxies set without CIDR format" do
+    Pleroma.Config.put([RemoteIp, :proxies], ["173.245.48.1"])
+
+    conn =
+      conn(:get, "/")
+      |> put_req_header("x-forwarded-for", "173.245.48.1, 1.1.1.1")
+      |> RemoteIp.call(nil)
+
+    assert conn.remote_ip == {1, 1, 1, 1}
+  end
+
+  test "proxies set `nonsensical` CIDR" do
+    Pleroma.Config.put([RemoteIp, :reserved], ["127.0.0.0/8"])
+    Pleroma.Config.put([RemoteIp, :proxies], ["10.0.0.3/24"])
+
+    conn =
+      conn(:get, "/")
+      |> put_req_header("x-forwarded-for", "10.0.0.3, 1.1.1.1")
+      |> RemoteIp.call(nil)
+
+    assert conn.remote_ip == {1, 1, 1, 1}
+  end
+end