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diff --git a/test/pleroma/config/deprecation_warnings_test.exs b/test/pleroma/config/deprecation_warnings_test.exs
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+++ b/test/pleroma/config/deprecation_warnings_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.Config.DeprecationWarningsTest do
+  use ExUnit.Case
+  use Pleroma.Tests.Helpers
+
+  import ExUnit.CaptureLog
+
+  alias Pleroma.Config
+  alias Pleroma.Config.DeprecationWarnings
+
+  test "check_old_mrf_config/0" do
+    clear_config([:instance, :rewrite_policy], Pleroma.Web.ActivityPub.MRF.NoOpPolicy)
+    clear_config([:instance, :mrf_transparency], true)
+    clear_config([:instance, :mrf_transparency_exclusions], [])
+
+    assert capture_log(fn -> DeprecationWarnings.check_old_mrf_config() end) =~
+             """
+             !!!DEPRECATION WARNING!!!
+             Your config is using old namespaces for MRF configuration. They should work for now, but you are advised to change to new namespaces to prevent possible issues later:
+
+             * `config :pleroma, :instance, rewrite_policy` is now `config :pleroma, :mrf, policies`
+             * `config :pleroma, :instance, mrf_transparency` is now `config :pleroma, :mrf, transparency`
+             * `config :pleroma, :instance, mrf_transparency_exclusions` is now `config :pleroma, :mrf, transparency_exclusions`
+             """
+  end
+
+  test "move_namespace_and_warn/2" do
+    old_group1 = [:group, :key]
+    old_group2 = [:group, :key2]
+    old_group3 = [:group, :key3]
+
+    new_group1 = [:another_group, :key4]
+    new_group2 = [:another_group, :key5]
+    new_group3 = [:another_group, :key6]
+
+    clear_config(old_group1, 1)
+    clear_config(old_group2, 2)
+    clear_config(old_group3, 3)
+
+    clear_config(new_group1)
+    clear_config(new_group2)
+    clear_config(new_group3)
+
+    config_map = [
+      {old_group1, new_group1, "\n error :key"},
+      {old_group2, new_group2, "\n error :key2"},
+      {old_group3, new_group3, "\n error :key3"}
+    ]
+
+    assert capture_log(fn ->
+             DeprecationWarnings.move_namespace_and_warn(
+               config_map,
+               "Warning preface"
+             )
+           end) =~ "Warning preface\n error :key\n error :key2\n error :key3"
+
+    assert Config.get(new_group1) == 1
+    assert Config.get(new_group2) == 2
+    assert Config.get(new_group3) == 3
+  end
+
+  test "check_media_proxy_whitelist_config/0" do
+    clear_config([:media_proxy, :whitelist], ["https://example.com", "example2.com"])
+
+    assert capture_log(fn ->
+             DeprecationWarnings.check_media_proxy_whitelist_config()
+           end) =~ "Your config is using old format (only domain) for MediaProxy whitelist option"
+  end
+
+  test "check_welcome_message_config/0" do
+    clear_config([:instance, :welcome_user_nickname], "LainChan")
+
+    assert capture_log(fn ->
+             DeprecationWarnings.check_welcome_message_config()
+           end) =~ "Your config is using the old namespace for Welcome messages configuration."
+  end
+
+  test "check_hellthread_threshold/0" do
+    clear_config([:mrf_hellthread, :threshold], 16)
+
+    assert capture_log(fn ->
+             DeprecationWarnings.check_hellthread_threshold()
+           end) =~ "You are using the old configuration mechanism for the hellthread filter."
+  end
+
+  test "check_activity_expiration_config/0" do
+    clear_config(Pleroma.ActivityExpiration, enabled: true)
+
+    assert capture_log(fn ->
+             DeprecationWarnings.check_activity_expiration_config()
+           end) =~ "Your config is using old namespace for activity expiration configuration."
+  end
+
+  describe "check_gun_pool_options/0" do
+    test "await_up_timeout" do
+      config = Config.get(:connections_pool)
+      clear_config(:connections_pool, Keyword.put(config, :await_up_timeout, 5_000))
+
+      assert capture_log(fn ->
+               DeprecationWarnings.check_gun_pool_options()
+             end) =~
+               "Your config is using old setting `config :pleroma, :connections_pool, await_up_timeout`."
+    end
+
+    test "pool timeout" do
+      old_config = [
+        federation: [
+          size: 50,
+          max_waiting: 10,
+          timeout: 10_000
+        ],
+        media: [
+          size: 50,
+          max_waiting: 10,
+          timeout: 10_000
+        ],
+        upload: [
+          size: 25,
+          max_waiting: 5,
+          timeout: 15_000
+        ],
+        default: [
+          size: 10,
+          max_waiting: 2,
+          timeout: 5_000
+        ]
+      ]
+
+      clear_config(:pools, old_config)
+
+      assert capture_log(fn ->
+               DeprecationWarnings.check_gun_pool_options()
+             end) =~
+               "Your config is using old setting name `timeout` instead of `recv_timeout` in pool settings"
+    end
+  end
+end