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diff --git a/test/pleroma/application/environment_test.exs b/test/pleroma/application/environment_test.exs
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+++ b/test/pleroma/application/environment_test.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Application.EnvironmentTest do
+  use Pleroma.DataCase
+
+  import Pleroma.Factory
+
+  alias Pleroma.Application.Environment
+
+  setup do: clear_config(:configurable_from_database, true)
+
+  describe "load_from_db_and_update/0" do
+    test "transfer config values from db to env" do
+      refute Application.get_env(:pleroma, :test_key)
+      refute Application.get_env(:idna, :test_key)
+      refute Application.get_env(:quack, :test_key)
+      refute Application.get_env(:postgrex, :test_key)
+      initial = Application.get_env(:logger, :level)
+
+      insert(:config, key: :test_key, value: [live: 2, com: 3])
+      insert(:config, group: :idna, key: :test_key, value: [live: 15, com: 35])
+
+      insert(:config,
+        group: :quack,
+        key: nil,
+        value: [test_key: [key1: :test_value1, key2: :test_value2]]
+      )
+
+      insert(:config, group: :logger, key: nil, value: [level: :debug])
+
+      Environment.load_from_db_and_update()
+
+      assert Application.get_env(:pleroma, :test_key) == [live: 2, com: 3]
+      assert Application.get_env(:idna, :test_key) == [live: 15, com: 35]
+      assert Application.get_env(:quack, :test_key) == [key1: :test_value1, key2: :test_value2]
+      assert Application.get_env(:logger, :level) == :debug
+
+      on_exit(fn ->
+        Application.delete_env(:pleroma, :test_key)
+        Application.delete_env(:idna, :test_key)
+        Application.delete_env(:quack, :test_key)
+        Application.delete_env(:postgrex, :test_key)
+        Application.put_env(:logger, :level, initial)
+      end)
+    end
+
+    test "transfer config values for 1 group and some keys" do
+      quack_env = Application.get_all_env(:quack)
+
+      insert(:config, group: :quack, key: nil, value: [level: :info, meta: [:none]])
+
+      Environment.load_from_db_and_update()
+
+      assert Application.get_env(:quack, :level) == :info
+      assert Application.get_env(:quack, :meta) == [:none]
+      default = Pleroma.Config.Holder.default_config(:quack, :webhook_url)
+      assert Application.get_env(:quack, :webhook_url) == default
+
+      on_exit(fn ->
+        Application.put_all_env(quack: quack_env)
+      end)
+    end
+
+    test "transfer config values with full subkey update" do
+      clear_config(:emoji)
+      clear_config(:assets)
+
+      insert(:config, key: :emoji, value: [groups: [a: 1, b: 2]])
+      insert(:config, key: :assets, value: [mascots: [a: 1, b: 2]])
+
+      Environment.load_from_db_and_update()
+
+      emoji_env = Application.get_env(:pleroma, :emoji)
+      assert emoji_env[:groups] == [a: 1, b: 2]
+      assets_env = Application.get_env(:pleroma, :assets)
+      assert assets_env[:mascots] == [a: 1, b: 2]
+    end
+  end
+
+  describe "update/2 :ex_syslogger" do
+    setup do
+      initial = Application.get_env(:logger, :ex_syslogger)
+
+      config =
+        insert(:config,
+          group: :logger,
+          key: nil,
+          value: [
+            ex_syslogger: [
+              level: :warn,
+              ident: "pleroma",
+              format: "$metadata[$level] $message",
+              metadata: [:request_id, :key]
+            ]
+          ]
+        )
+
+      on_exit(fn -> Application.put_env(:logger, :ex_syslogger, initial) end)
+      [config: config, initial: initial]
+    end
+
+    test "changing", %{config: config} do
+      assert Environment.update([config]) == :ok
+
+      env = Application.get_env(:logger, :ex_syslogger)
+      assert env[:level] == :warn
+      assert env[:metadata] == [:request_id, :key]
+    end
+
+    test "deletion", %{config: config, initial: initial} do
+      assert Environment.update([config]) == :ok
+
+      {:ok, config} = Pleroma.ConfigDB.delete(config)
+      assert Environment.update([config]) == :ok
+
+      env = Application.get_env(:logger, :ex_syslogger)
+
+      assert env == initial
+    end
+  end
+
+  describe "update/2 :console" do
+    setup do
+      initial = Application.get_env(:logger, :console)
+
+      config =
+        insert(:config,
+          group: :logger,
+          key: nil,
+          value: [
+            console: [
+              level: :info,
+              format: "$time $metadata[$level]",
+              metadata: [:request_id, :key]
+            ]
+          ]
+        )
+
+      on_exit(fn -> Application.put_env(:logger, :console, initial) end)
+      [config: config, initial: initial]
+    end
+
+    test "change", %{config: config} do
+      assert Environment.update([config]) == :ok
+      env = Application.get_env(:logger, :console)
+      assert env[:level] == :info
+      assert env[:format] == "$time $metadata[$level]"
+      assert env[:metadata] == [:request_id, :key]
+    end
+
+    test "deletion", %{config: config, initial: initial} do
+      assert Environment.update([config]) == :ok
+      {:ok, config} = Pleroma.ConfigDB.delete(config)
+      assert Environment.update([config]) == :ok
+
+      env = Application.get_env(:logger, :console)
+      assert env == initial
+    end
+  end
+
+  describe "update/2 :backends" do
+    setup do
+      initial = Application.get_all_env(:logger)
+
+      config =
+        insert(:config, group: :logger, key: nil, value: [backends: [:console, :ex_syslogger]])
+
+      on_exit(fn -> Application.put_all_env(logger: initial) end)
+
+      [config: config, initial: initial]
+    end
+
+    test "change", %{config: config} do
+      assert Environment.update([config]) == :ok
+      env = Application.get_all_env(:logger)
+      assert env[:backends] == [:console, :ex_syslogger]
+    end
+
+    test "deletion", %{config: config, initial: initial} do
+      assert Environment.update([config]) == :ok
+      {:ok, config} = Pleroma.ConfigDB.delete(config)
+      assert Environment.update([config])
+
+      env = Application.get_all_env(:logger)
+      assert env == initial
+    end
+  end
+
+  describe "update/2 logger settings" do
+    setup do
+      initial = Application.get_all_env(:logger)
+
+      config =
+        insert(:config,
+          group: :logger,
+          key: nil,
+          value: [
+            console: [
+              level: :info,
+              format: "$time $metadata[$level]",
+              metadata: [:request_id, :key]
+            ],
+            ex_syslogger: [
+              level: :warn,
+              ident: "pleroma",
+              format: "$metadata[$level] $message",
+              metadata: [:request_id, :key]
+            ],
+            backends: [:console, :ex_syslogger]
+          ]
+        )
+
+      on_exit(fn -> Application.put_all_env(logger: initial) end)
+      [config: config]
+    end
+
+    test "change", %{config: config} do
+      assert Environment.update([config]) == :ok
+
+      env =
+        :logger
+        |> Application.get_all_env()
+        |> Keyword.take([:backends, :console, :ex_syslogger])
+
+      assert env[:console] == config.value[:console]
+      assert env[:ex_syslogger] == config.value[:ex_syslogger]
+      assert env[:backends] == config.value[:backends]
+    end
+  end
+
+  test "update/2 for change without key :cors_plug" do
+    config =
+      insert(:config,
+        group: :cors_plug,
+        key: nil,
+        value: [max_age: 300, methods: ["GET"]]
+      )
+
+    assert Environment.update([config]) == :ok
+
+    env = Application.get_all_env(:cors_plug)
+
+    assert env[:max_age] == 300
+    assert env[:methods] == ["GET"]
+  end
+end