diff --git a/test/pleroma/application_test.exs b/test/pleroma/application_test.exs
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2026 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.ApplicationTest do
+  use Pleroma.DataCase
+
+  import ExUnit.CaptureLog
+
+  # clear_config/2 can only manipulate env under :pleroma.
+  describe "config :logger, backends: []" do
+    setup do
+      Application.put_env(:logger, :backends, [:console, {ExSyslogger, :ex_syslogger}])
+
+      on_exit(fn ->
+        Application.delete_env(:logger, :backends) end)
+    end
+
+    test "warns on deprecated syntax" do
+      assert capture_log(fn -> Pleroma.Application.configure_logger() end) =~
+        "'config :logger, backends: [...]' is deprecated syntax due to changes in Elixir. Use 'config :pleroma, :logger, backends: [...]' instead."
+    end
+  end
+
+  describe "config :pleroma, :logger, backends: [{:ex_syslogger, :ex_syslogger}]" do
+    setup do
+      clear_config([:logger, :backends], [{:ex_syslogger, :ex_syslogger}])
+    end
+
+    test "is handled" do
+      log = capture_log(fn -> Pleroma.Application.configure_logger() end)
+
+      assert log =~ "Configuration {:ex_syslogger, :ex_syslogger} is incorrect. Use {ExSyslogger, :ex_syslogger} instead!"
+      assert log =~ "Successfully added logger backend: {ExSyslogger, :ex_syslogger}"
+    end
+  end
+end