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diff --git a/test/pleroma/web/plugs/set_locale_plug_test.exs b/test/pleroma/web/plugs/set_locale_plug_test.exs
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+++ b/test/pleroma/web/plugs/set_locale_plug_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.SetLocalePlugTest do
+  use ExUnit.Case, async: true
+  use Plug.Test
+
+  alias Pleroma.Web.Plugs.SetLocalePlug
+  alias Plug.Conn
+
+  test "default locale is `en`" do
+    conn =
+      :get
+      |> conn("/cofe")
+      |> SetLocalePlug.call([])
+
+    assert "en" == Gettext.get_locale()
+    assert %{locale: "en"} == conn.assigns
+  end
+
+  test "use supported locale from `accept-language`" do
+    conn =
+      :get
+      |> conn("/cofe")
+      |> Conn.put_req_header(
+        "accept-language",
+        "ru, fr-CH, fr;q=0.9, en;q=0.8, *;q=0.5"
+      )
+      |> SetLocalePlug.call([])
+
+    assert "ru" == Gettext.get_locale()
+    assert %{locale: "ru"} == conn.assigns
+  end
+
+  test "use default locale if locale from `accept-language` is not supported" do
+    conn =
+      :get
+      |> conn("/cofe")
+      |> Conn.put_req_header("accept-language", "tlh")
+      |> SetLocalePlug.call([])
+
+    assert "en" == Gettext.get_locale()
+    assert %{locale: "en"} == conn.assigns
+  end
+end