14 files changed, 533 insertions, 22 deletions
diff --git a/test/mix/tasks/pleroma/digest_test.exs b/test/mix/tasks/pleroma/digest_test.exs
index 0a25b508f..d2a8606c7 100644
--- a/test/mix/tasks/pleroma/digest_test.exs
+++ b/test/mix/tasks/pleroma/digest_test.exs
@@ -53,7 +53,13 @@ defmodule Mix.Tasks.Pleroma.DigestTest do
 
       assert_email_sent(
         to: {user2.name, user2.email},
-        html_body: ~r/here is what you've missed!/i
+        html_body:
+          Regex.compile!(
+            "here is what you've missed!"
+            |> Phoenix.HTML.html_escape()
+            |> Phoenix.HTML.safe_to_string(),
+            "i"
+          )
       )
     end
   end
diff --git a/test/pleroma/config_db_test.exs b/test/pleroma/config_db_test.exs
index ea44b716f..ba7c615e2 100644
--- a/test/pleroma/config_db_test.exs
+++ b/test/pleroma/config_db_test.exs
@@ -238,10 +238,11 @@ defmodule Pleroma.ConfigDBTest do
     end
 
     test "ssl options" do
-      assert ConfigDB.to_elixir_types([":tlsv1", ":tlsv1.1", ":tlsv1.2"]) == [
+      assert ConfigDB.to_elixir_types([":tlsv1", ":tlsv1.1", ":tlsv1.2", ":tlsv1.3"]) == [
                :tlsv1,
                :"tlsv1.1",
-               :"tlsv1.2"
+               :"tlsv1.2",
+               :"tlsv1.3"
              ]
     end
 
diff --git a/test/pleroma/docs/generator_test.exs b/test/pleroma/docs/generator_test.exs
index 92b4d13e4..5e41d6ccb 100644
--- a/test/pleroma/docs/generator_test.exs
+++ b/test/pleroma/docs/generator_test.exs
@@ -86,7 +86,7 @@ defmodule Pleroma.Docs.GeneratorTest do
           key: :versions,
           type: {:list, :atom},
           description: "List of TLS version to use",
-          suggestions: [:tlsv1, ":tlsv1.1", ":tlsv1.2"]
+          suggestions: [:tlsv1, ":tlsv1.1", ":tlsv1.2", ":tlsv1.3"]
         }
       ]
     },
@@ -213,7 +213,7 @@ defmodule Pleroma.Docs.GeneratorTest do
     test "suggestion for tls versions" do
       [%{children: children} | _] = Generator.convert_to_strings(@descriptions)
       child = Enum.at(children, 8)
-      assert child[:suggestions] == [":tlsv1", ":tlsv1.1", ":tlsv1.2"]
+      assert child[:suggestions] == [":tlsv1", ":tlsv1.1", ":tlsv1.2", ":tlsv1.3"]
     end
 
     test "subgroup with module name" do
diff --git a/test/pleroma/emails/user_email_test.exs b/test/pleroma/emails/user_email_test.exs
index e0f6fd83b..7061148b0 100644
--- a/test/pleroma/emails/user_email_test.exs
+++ b/test/pleroma/emails/user_email_test.exs
@@ -56,4 +56,16 @@ defmodule Pleroma.Emails.UserEmailTest do
     assert email.subject == "Your account is awaiting approval"
     assert email.html_body =~ "Awaiting Approval"
   end
+
+  test "email i18n" do
+    user = insert(:user, language: "en_test")
+    email = UserEmail.approval_pending_email(user)
+    assert email.subject == "xxYour account is awaiting approvalxx"
+  end
+
+  test "email i18n should fallback to default locale if user language is unsupported" do
+    user = insert(:user, language: "unsupported")
+    email = UserEmail.approval_pending_email(user)
+    assert email.subject == "Your account is awaiting approval"
+  end
 end
diff --git a/test/pleroma/notification_test.exs b/test/pleroma/notification_test.exs
index 340a5f841..805764ea4 100644
--- a/test/pleroma/notification_test.exs
+++ b/test/pleroma/notification_test.exs
@@ -520,6 +520,25 @@ defmodule Pleroma.NotificationTest do
     end
   end
 
+  describe "destroy_multiple_from_types/2" do
+    test "clears all notifications of a certain type for a given user" do
+      report_activity = insert(:report_activity)
+      user1 = insert(:user, is_moderator: true, is_admin: true)
+      user2 = insert(:user, is_moderator: true, is_admin: true)
+      {:ok, _} = Notification.create_notifications(report_activity)
+
+      {:ok, _} =
+        CommonAPI.post(user2, %{
+          status: "hey @#{user1.nickname} !"
+        })
+
+      Notification.destroy_multiple_from_types(user1, ["pleroma:report"])
+
+      assert [%Pleroma.Notification{type: "mention"}] = Notification.for_user(user1)
+      assert [%Pleroma.Notification{type: "pleroma:report"}] = Notification.for_user(user2)
+    end
+  end
+
   describe "set_read_up_to()" do
     test "it sets all notifications as read up to a specified notification ID" do
       user = insert(:user)
diff --git a/test/pleroma/user_test.exs b/test/pleroma/user_test.exs
index bb28a3f81..884b846ae 100644
--- a/test/pleroma/user_test.exs
+++ b/test/pleroma/user_test.exs
@@ -5,6 +5,7 @@
 defmodule Pleroma.UserTest do
   alias Pleroma.Activity
   alias Pleroma.Builders.UserBuilder
+  alias Pleroma.Notification
   alias Pleroma.Object
   alias Pleroma.Repo
   alias Pleroma.Tests.ObanHelpers
@@ -2210,6 +2211,26 @@ defmodule Pleroma.UserTest do
       assert {:ok, user} = Cachex.get(:user_cache, "ap_id:#{user.ap_id}")
       assert %User{bio: "test-bio"} = User.get_cached_by_ap_id(user.ap_id)
     end
+
+    test "removes report notifs when user isn't superuser any more" do
+      report_activity = insert(:report_activity)
+      user = insert(:user, is_moderator: true, is_admin: true)
+      {:ok, _} = Notification.create_notifications(report_activity)
+
+      assert [%Pleroma.Notification{type: "pleroma:report"}] = Notification.for_user(user)
+
+      {:ok, user} = user |> User.admin_api_update(%{is_moderator: false})
+      # is still superuser because still admin
+      assert [%Pleroma.Notification{type: "pleroma:report"}] = Notification.for_user(user)
+
+      {:ok, user} = user |> User.admin_api_update(%{is_moderator: true, is_admin: false})
+      # is still superuser because still moderator
+      assert [%Pleroma.Notification{type: "pleroma:report"}] = Notification.for_user(user)
+
+      {:ok, user} = user |> User.admin_api_update(%{is_moderator: false})
+      # is not a superuser any more
+      assert [] = Notification.for_user(user)
+    end
   end
 
   describe "following/followers synchronization" do
diff --git a/test/pleroma/web/activity_pub/activity_pub_controller_test.exs b/test/pleroma/web/activity_pub/activity_pub_controller_test.exs
index 1923ec479..1c5c40e84 100644
--- a/test/pleroma/web/activity_pub/activity_pub_controller_test.exs
+++ b/test/pleroma/web/activity_pub/activity_pub_controller_test.exs
@@ -291,6 +291,30 @@ defmodule Pleroma.Web.ActivityPub.ActivityPubControllerTest do
       assert json_response(conn, 200) == ObjectView.render("object.json", %{object: note})
     end
 
+    test "does not cache authenticated response", %{conn: conn} do
+      user = insert(:user)
+      reader = insert(:user)
+
+      {:ok, post} =
+        CommonAPI.post(user, %{status: "test @#{reader.nickname}", visibility: "local"})
+
+      object = Object.normalize(post, fetch: false)
+      uuid = String.split(object.data["id"], "/") |> List.last()
+
+      assert response =
+               conn
+               |> assign(:user, reader)
+               |> put_req_header("accept", "application/activity+json")
+               |> get("/objects/#{uuid}")
+
+      json_response(response, 200)
+
+      conn
+      |> put_req_header("accept", "application/activity+json")
+      |> get("/objects/#{uuid}")
+      |> json_response(404)
+    end
+
     test "it returns 404 for non-public messages", %{conn: conn} do
       note = insert(:direct_note)
       uuid = String.split(note.data["id"], "/") |> List.last()
diff --git a/test/pleroma/web/activity_pub/mrf/anti_followbot_policy_test.exs b/test/pleroma/web/activity_pub/mrf/anti_followbot_policy_test.exs
index 8192629c6..732a5a7f3 100644
--- a/test/pleroma/web/activity_pub/mrf/anti_followbot_policy_test.exs
+++ b/test/pleroma/web/activity_pub/mrf/anti_followbot_policy_test.exs
@@ -6,6 +6,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.AntiFollowbotPolicyTest do
   use Pleroma.DataCase, async: true
   import Pleroma.Factory
 
+  alias Pleroma.User
   alias Pleroma.Web.ActivityPub.MRF.AntiFollowbotPolicy
 
   describe "blocking based on attributes" do
@@ -38,21 +39,55 @@ defmodule Pleroma.Web.ActivityPub.MRF.AntiFollowbotPolicyTest do
 
       assert {:reject, "[AntiFollowbotPolicy]" <> _} = AntiFollowbotPolicy.filter(message)
     end
+
+    test "matches followbots by actor_type" do
+      actor = insert(:user, %{actor_type: "Service"})
+      target = insert(:user)
+
+      message = %{
+        "@context" => "https://www.w3.org/ns/activitystreams",
+        "type" => "Follow",
+        "actor" => actor.ap_id,
+        "object" => target.ap_id,
+        "id" => "https://example.com/activities/1234"
+      }
+
+      assert {:reject, "[AntiFollowbotPolicy]" <> _} = AntiFollowbotPolicy.filter(message)
+    end
   end
 
-  test "it allows non-followbots" do
-    actor = insert(:user)
-    target = insert(:user)
+  describe "it allows" do
+    test "non-followbots" do
+      actor = insert(:user)
+      target = insert(:user)
 
-    message = %{
-      "@context" => "https://www.w3.org/ns/activitystreams",
-      "type" => "Follow",
-      "actor" => actor.ap_id,
-      "object" => target.ap_id,
-      "id" => "https://example.com/activities/1234"
-    }
+      message = %{
+        "@context" => "https://www.w3.org/ns/activitystreams",
+        "type" => "Follow",
+        "actor" => actor.ap_id,
+        "object" => target.ap_id,
+        "id" => "https://example.com/activities/1234"
+      }
 
-    {:ok, _} = AntiFollowbotPolicy.filter(message)
+      {:ok, _} = AntiFollowbotPolicy.filter(message)
+    end
+
+    test "bots if the target follows the bots" do
+      actor = insert(:user, %{actor_type: "Service"})
+      target = insert(:user)
+
+      User.follow(target, actor)
+
+      message = %{
+        "@context" => "https://www.w3.org/ns/activitystreams",
+        "type" => "Follow",
+        "actor" => actor.ap_id,
+        "object" => target.ap_id,
+        "id" => "https://example.com/activities/1234"
+      }
+
+      {:ok, _} = AntiFollowbotPolicy.filter(message)
+    end
   end
 
   test "it gracefully handles nil display names" do
diff --git a/test/pleroma/web/activity_pub/mrf/steal_emoji_policy_test.exs b/test/pleroma/web/activity_pub/mrf/steal_emoji_policy_test.exs
index c537670f2..89d32352f 100644
--- a/test/pleroma/web/activity_pub/mrf/steal_emoji_policy_test.exs
+++ b/test/pleroma/web/activity_pub/mrf/steal_emoji_policy_test.exs
@@ -60,7 +60,7 @@ defmodule Pleroma.Web.ActivityPub.MRF.StealEmojiPolicyTest do
            |> File.exists?()
   end
 
-  test "reject shortcode", %{message: message} do
+  test "reject regex shortcode", %{message: message} do
     refute "firedfox" in installed()
 
     clear_config(:mrf_steal_emoji,
@@ -74,6 +74,20 @@ defmodule Pleroma.Web.ActivityPub.MRF.StealEmojiPolicyTest do
     refute "firedfox" in installed()
   end
 
+  test "reject string shortcode", %{message: message} do
+    refute "firedfox" in installed()
+
+    clear_config(:mrf_steal_emoji,
+      hosts: ["example.org"],
+      size_limit: 284_468,
+      rejected_shortcodes: ["firedfox"]
+    )
+
+    assert {:ok, _message} = StealEmojiPolicy.filter(message)
+
+    refute "firedfox" in installed()
+  end
+
   test "reject if size is above the limit", %{message: message} do
     refute "firedfox" in installed()
 
diff --git a/test/pleroma/web/admin_api/controllers/report_controller_test.exs b/test/pleroma/web/admin_api/controllers/report_controller_test.exs
index 6211956c6..30dcb87e2 100644
--- a/test/pleroma/web/admin_api/controllers/report_controller_test.exs
+++ b/test/pleroma/web/admin_api/controllers/report_controller_test.exs
@@ -355,7 +355,6 @@ defmodule Pleroma.Web.AdminAPI.ReportControllerTest do
              } = note
     end
 
-    @tag :erratic
     test "it returns reports with notes", %{conn: conn, admin: admin} do
       conn = get(conn, "/api/pleroma/admin/reports")
 
@@ -364,7 +363,8 @@ defmodule Pleroma.Web.AdminAPI.ReportControllerTest do
       [note, _] = notes
 
       assert note["user"]["nickname"] == admin.nickname
-      assert note["content"] == "this is disgusting!"
+      # We use '=~' because the order of the notes isn't guaranteed
+      assert note["content"] =~ "this is disgusting"
       assert note["created_at"]
       assert response["total"] == 1
     end
diff --git a/test/pleroma/web/gettext_test.exs b/test/pleroma/web/gettext_test.exs
new file mode 100644
index 000000000..e186f1ab3
--- /dev/null
+++ b/test/pleroma/web/gettext_test.exs
@@ -0,0 +1,173 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.GettextTest do
+  use ExUnit.Case
+
+  require Pleroma.Web.Gettext
+
+  test "put_locales/1: set the first in the list to Gettext's locale" do
+    Pleroma.Web.Gettext.put_locales(["zh_Hans", "en_test"])
+
+    assert "zh_Hans" == Gettext.get_locale(Pleroma.Web.Gettext)
+  end
+
+  test "with_locales/2: reset locale on exit" do
+    old_first_locale = Gettext.get_locale(Pleroma.Web.Gettext)
+    old_locales = Pleroma.Web.Gettext.get_locales()
+
+    Pleroma.Web.Gettext.with_locales ["zh_Hans", "en_test"] do
+      assert "zh_Hans" == Gettext.get_locale(Pleroma.Web.Gettext)
+      assert ["zh_Hans", "en_test"] == Pleroma.Web.Gettext.get_locales()
+    end
+
+    assert old_first_locale == Gettext.get_locale(Pleroma.Web.Gettext)
+    assert old_locales == Pleroma.Web.Gettext.get_locales()
+  end
+
+  describe "handle_missing_translation/5" do
+    test "fallback to next locale if some translation is not available" do
+      Pleroma.Web.Gettext.with_locales ["x_unsupported", "en_test"] do
+        assert "xxYour account is awaiting approvalxx" ==
+                 Pleroma.Web.Gettext.dpgettext(
+                   "static_pages",
+                   "approval pending email subject",
+                   "Your account is awaiting approval"
+                 )
+      end
+    end
+
+    test "putting en locale at the front should not make gettext fallback unexpectedly" do
+      Pleroma.Web.Gettext.with_locales ["en", "en_test"] do
+        assert "Your account is awaiting approval" ==
+                 Pleroma.Web.Gettext.dpgettext(
+                   "static_pages",
+                   "approval pending email subject",
+                   "Your account is awaiting approval"
+                 )
+      end
+    end
+
+    test "duplicated locale in list should not result in infinite loops" do
+      Pleroma.Web.Gettext.with_locales ["x_unsupported", "x_unsupported", "en_test"] do
+        assert "xxYour account is awaiting approvalxx" ==
+                 Pleroma.Web.Gettext.dpgettext(
+                   "static_pages",
+                   "approval pending email subject",
+                   "Your account is awaiting approval"
+                 )
+      end
+    end
+
+    test "direct interpolation" do
+      Pleroma.Web.Gettext.with_locales ["en_test"] do
+        assert "xxYour digest from some instancexx" ==
+                 Pleroma.Web.Gettext.dpgettext(
+                   "static_pages",
+                   "digest email subject",
+                   "Your digest from %{instance_name}",
+                   instance_name: "some instance"
+                 )
+      end
+    end
+
+    test "fallback with interpolation" do
+      Pleroma.Web.Gettext.with_locales ["x_unsupported", "en_test"] do
+        assert "xxYour digest from some instancexx" ==
+                 Pleroma.Web.Gettext.dpgettext(
+                   "static_pages",
+                   "digest email subject",
+                   "Your digest from %{instance_name}",
+                   instance_name: "some instance"
+                 )
+      end
+    end
+
+    test "fallback to msgid" do
+      Pleroma.Web.Gettext.with_locales ["x_unsupported"] do
+        assert "Your digest from some instance" ==
+                 Pleroma.Web.Gettext.dpgettext(
+                   "static_pages",
+                   "digest email subject",
+                   "Your digest from %{instance_name}",
+                   instance_name: "some instance"
+                 )
+      end
+    end
+  end
+
+  describe "handle_missing_plural_translation/7" do
+    test "direct interpolation" do
+      Pleroma.Web.Gettext.with_locales ["en_test"] do
+        assert "xx1 New Followerxx" ==
+                 Pleroma.Web.Gettext.dpngettext(
+                   "static_pages",
+                   "new followers count header",
+                   "%{count} New Follower",
+                   "%{count} New Followers",
+                   1,
+                   count: 1
+                 )
+
+        assert "xx5 New Followersxx" ==
+                 Pleroma.Web.Gettext.dpngettext(
+                   "static_pages",
+                   "new followers count header",
+                   "%{count} New Follower",
+                   "%{count} New Followers",
+                   5,
+                   count: 5
+                 )
+      end
+    end
+
+    test "fallback with interpolation" do
+      Pleroma.Web.Gettext.with_locales ["x_unsupported", "en_test"] do
+        assert "xx1 New Followerxx" ==
+                 Pleroma.Web.Gettext.dpngettext(
+                   "static_pages",
+                   "new followers count header",
+                   "%{count} New Follower",
+                   "%{count} New Followers",
+                   1,
+                   count: 1
+                 )
+
+        assert "xx5 New Followersxx" ==
+                 Pleroma.Web.Gettext.dpngettext(
+                   "static_pages",
+                   "new followers count header",
+                   "%{count} New Follower",
+                   "%{count} New Followers",
+                   5,
+                   count: 5
+                 )
+      end
+    end
+
+    test "fallback to msgid" do
+      Pleroma.Web.Gettext.with_locales ["x_unsupported"] do
+        assert "1 New Follower" ==
+                 Pleroma.Web.Gettext.dpngettext(
+                   "static_pages",
+                   "new followers count header",
+                   "%{count} New Follower",
+                   "%{count} New Followers",
+                   1,
+                   count: 1
+                 )
+
+        assert "5 New Followers" ==
+                 Pleroma.Web.Gettext.dpngettext(
+                   "static_pages",
+                   "new followers count header",
+                   "%{count} New Follower",
+                   "%{count} New Followers",
+                   5,
+                   count: 5
+                 )
+      end
+    end
+  end
+end
diff --git a/test/pleroma/web/mastodon_api/controllers/account_controller_test.exs b/test/pleroma/web/mastodon_api/controllers/account_controller_test.exs
index 853d2c111..effa2144f 100644
--- a/test/pleroma/web/mastodon_api/controllers/account_controller_test.exs
+++ b/test/pleroma/web/mastodon_api/controllers/account_controller_test.exs
@@ -13,6 +13,7 @@ defmodule Pleroma.Web.MastodonAPI.AccountControllerTest do
   alias Pleroma.Web.ActivityPub.InternalFetchActor
   alias Pleroma.Web.CommonAPI
   alias Pleroma.Web.OAuth.Token
+  alias Pleroma.Web.Plugs.SetLocalePlug
 
   import Pleroma.Factory
 
@@ -1662,6 +1663,75 @@ defmodule Pleroma.Web.MastodonAPI.AccountControllerTest do
     end
   end
 
+  describe "create account with language" do
+    setup %{conn: conn} do
+      app_token = insert(:oauth_token, user: nil)
+
+      conn =
+        conn
+        |> put_req_header("authorization", "Bearer " <> app_token.token)
+        |> put_req_header("content-type", "multipart/form-data")
+        |> put_req_cookie(SetLocalePlug.frontend_language_cookie_name(), "zh-Hans")
+        |> SetLocalePlug.call([])
+
+      [conn: conn]
+    end
+
+    test "creates an account with language parameter", %{conn: conn} do
+      params = %{
+        username: "foo",
+        email: "foo@example.org",
+        password: "dupa.8",
+        agreement: true,
+        language: "ru"
+      }
+
+      res =
+        conn
+        |> post("/api/v1/accounts", params)
+
+      assert json_response_and_validate_schema(res, 200)
+
+      assert %{language: "ru"} = Pleroma.User.get_by_nickname("foo")
+    end
+
+    test "language parameter should be normalized", %{conn: conn} do
+      params = %{
+        username: "foo",
+        email: "foo@example.org",
+        password: "dupa.8",
+        agreement: true,
+        language: "ru-RU"
+      }
+
+      res =
+        conn
+        |> post("/api/v1/accounts", params)
+
+      assert json_response_and_validate_schema(res, 200)
+
+      assert %{language: "ru_RU"} = Pleroma.User.get_by_nickname("foo")
+    end
+
+    test "createing an account without language parameter should fallback to cookie/header language",
+         %{conn: conn} do
+      params = %{
+        username: "foo2",
+        email: "foo2@example.org",
+        password: "dupa.8",
+        agreement: true
+      }
+
+      res =
+        conn
+        |> post("/api/v1/accounts", params)
+
+      assert json_response_and_validate_schema(res, 200)
+
+      assert %{language: "zh_Hans"} = Pleroma.User.get_by_nickname("foo2")
+    end
+  end
+
   describe "GET /api/v1/accounts/:id/lists - account_lists" do
     test "returns lists to which the account belongs" do
       %{user: user, conn: conn} = oauth_access(["read:lists"])
diff --git a/test/pleroma/web/plugs/cache_test.exs b/test/pleroma/web/plugs/cache_test.exs
index d84e2d268..0c119528d 100644
--- a/test/pleroma/web/plugs/cache_test.exs
+++ b/test/pleroma/web/plugs/cache_test.exs
@@ -179,4 +179,22 @@ defmodule Pleroma.Web.Plugs.CacheTest do
              |> send_resp(:im_a_teapot, "🥤")
              |> sent_resp()
   end
+
+  test "ignores if skip_cache is assigned" do
+    assert @miss_resp ==
+             conn(:get, "/")
+             |> assign(:skip_cache, true)
+             |> Cache.call(%{query_params: false, ttl: nil})
+             |> put_resp_content_type("cofe/hot")
+             |> send_resp(:ok, "cofe")
+             |> sent_resp()
+
+    assert @miss_resp ==
+             conn(:get, "/")
+             |> assign(:skip_cache, true)
+             |> Cache.call(%{query_params: false, ttl: nil})
+             |> put_resp_content_type("cofe/hot")
+             |> send_resp(:ok, "cofe")
+             |> sent_resp()
+  end
 end
diff --git a/test/pleroma/web/plugs/set_locale_plug_test.exs b/test/pleroma/web/plugs/set_locale_plug_test.exs
index 4328b9d42..4f664f84e 100644
--- a/test/pleroma/web/plugs/set_locale_plug_test.exs
+++ b/test/pleroma/web/plugs/set_locale_plug_test.exs
@@ -16,7 +16,7 @@ defmodule Pleroma.Web.Plugs.SetLocalePlugTest do
       |> SetLocalePlug.call([])
 
     assert "en" == Gettext.get_locale()
-    assert %{locale: "en"} == conn.assigns
+    assert %{locale: "en"} = conn.assigns
   end
 
   test "use supported locale from `accept-language`" do
@@ -30,7 +30,125 @@ defmodule Pleroma.Web.Plugs.SetLocalePlugTest do
       |> SetLocalePlug.call([])
 
     assert "ru" == Gettext.get_locale()
-    assert %{locale: "ru"} == conn.assigns
+    assert %{locale: "ru"} = conn.assigns
+  end
+
+  test "fallback to the general language if a variant is not supported" do
+    conn =
+      :get
+      |> conn("/cofe")
+      |> Conn.put_req_header(
+        "accept-language",
+        "ru-CA;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 supported locale with specifiers from `accept-language`" do
+    conn =
+      :get
+      |> conn("/cofe")
+      |> Conn.put_req_header(
+        "accept-language",
+        "zh-Hans;q=0.9, en;q=0.8, *;q=0.5"
+      )
+      |> SetLocalePlug.call([])
+
+    assert "zh_Hans" == Gettext.get_locale()
+    assert %{locale: "zh_Hans"} = conn.assigns
+  end
+
+  test "it assigns all supported locales" do
+    conn =
+      :get
+      |> conn("/cofe")
+      |> Conn.put_req_header(
+        "accept-language",
+        "ru, fr-CH, fr;q=0.9, en;q=0.8, x-unsupported;q=0.8, *;q=0.5"
+      )
+      |> SetLocalePlug.call([])
+
+    assert "ru" == Gettext.get_locale()
+    assert %{locale: "ru", locales: ["ru", "fr", "en"]} = conn.assigns
+  end
+
+  test "it assigns all supported locales in cookie" do
+    conn =
+      :get
+      |> conn("/cofe")
+      |> put_req_cookie(SetLocalePlug.frontend_language_cookie_name(), "zh-Hans,uk,zh-Hant")
+      |> Conn.put_req_header(
+        "accept-language",
+        "ru, fr-CH, fr;q=0.9, en;q=0.8, x-unsupported;q=0.8, *;q=0.5"
+      )
+      |> SetLocalePlug.call([])
+
+    assert "zh_Hans" == Gettext.get_locale()
+
+    assert %{locale: "zh_Hans", locales: ["zh_Hans", "uk", "zh_Hant", "ru", "fr", "en"]} =
+             conn.assigns
+  end
+
+  test "fallback to some variant of the language if the unqualified language is not supported" do
+    conn =
+      :get
+      |> conn("/cofe")
+      |> Conn.put_req_header(
+        "accept-language",
+        "zh;q=0.9, en;q=0.8, *;q=0.5"
+      )
+      |> SetLocalePlug.call([])
+
+    assert "zh_" <> _ = Gettext.get_locale()
+    assert %{locale: "zh_" <> _} = conn.assigns
+  end
+
+  test "use supported locale from cookie" do
+    conn =
+      :get
+      |> conn("/cofe")
+      |> put_req_cookie(SetLocalePlug.frontend_language_cookie_name(), "zh-Hans")
+      |> Conn.put_req_header(
+        "accept-language",
+        "ru, fr-CH, fr;q=0.9, en;q=0.8, *;q=0.5"
+      )
+      |> SetLocalePlug.call([])
+
+    assert "zh_Hans" == Gettext.get_locale()
+    assert %{locale: "zh_Hans"} = conn.assigns
+  end
+
+  test "fallback to supported locale from `accept-language` if locale in cookie not supported" do
+    conn =
+      :get
+      |> conn("/cofe")
+      |> put_req_cookie(SetLocalePlug.frontend_language_cookie_name(), "x-nonexist")
+      |> 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 "fallback to default if nothing is supported" do
+    conn =
+      :get
+      |> conn("/cofe")
+      |> put_req_cookie(SetLocalePlug.frontend_language_cookie_name(), "x-nonexist")
+      |> Conn.put_req_header(
+        "accept-language",
+        "x-nonexist"
+      )
+      |> SetLocalePlug.call([])
+
+    assert "en" == Gettext.get_locale()
+    assert %{locale: "en"} = conn.assigns
   end
 
   test "use default locale if locale from `accept-language` is not supported" do
@@ -41,6 +159,6 @@ defmodule Pleroma.Web.Plugs.SetLocalePlugTest do
       |> SetLocalePlug.call([])
 
     assert "en" == Gettext.get_locale()
-    assert %{locale: "en"} == conn.assigns
+    assert %{locale: "en"} = conn.assigns
   end
 end