diff --git a/test/pleroma/application_requirements_test.exs b/test/pleroma/application_requirements_test.exs
index 2f5b049a3..9f55e5a1e 100644
--- a/test/pleroma/application_requirements_test.exs
+++ b/test/pleroma/application_requirements_test.exs
@@ -7,9 +7,11 @@ defmodule Pleroma.ApplicationRequirementsTest do
 
   import ExUnit.CaptureLog
   import Mock
+  import Mox
 
   alias Pleroma.ApplicationRequirements
   alias Pleroma.Repo
+  alias Pleroma.UnstubbedConfigMock, as: ConfigMock
 
   describe "check_repo_pool_size!/1" do
     test "raises if the pool size is unexpected" do
@@ -37,7 +39,11 @@ test "doesn't raise if the pool size is unexpected but the respective flag is se
 
     test "warns if welcome email enabled but mail disabled" do
       clear_config([:welcome, :email, :enabled], true)
-      clear_config([Pleroma.Emails.Mailer, :enabled], false)
+
+      ConfigMock
+      |> stub(:get, fn
+        [Pleroma.Emails.Mailer, :enabled] -> false
+      end)
 
       assert capture_log(fn ->
                assert Pleroma.ApplicationRequirements.verify!() == :ok
@@ -59,7 +65,11 @@ test "warns if welcome email enabled but mail disabled" do
 
     test "warns if account confirmation is required but mailer isn't enabled" do
       clear_config([:instance, :account_activation_required], true)
-      clear_config([Pleroma.Emails.Mailer, :enabled], false)
+
+      ConfigMock
+      |> stub(:get, fn
+        [Pleroma.Emails.Mailer, :enabled] -> false
+      end)
 
       assert capture_log(fn ->
                assert Pleroma.ApplicationRequirements.verify!() == :ok
@@ -74,7 +84,12 @@ test "doesn't do anything if account confirmation is disabled" do
 
     test "doesn't do anything if account confirmation is required and mailer is enabled" do
       clear_config([:instance, :account_activation_required], true)
-      clear_config([Pleroma.Emails.Mailer, :enabled], true)
+
+      ConfigMock
+      |> stub(:get, fn
+        [Pleroma.Emails.Mailer, :enabled] -> true
+      end)
+
       assert Pleroma.ApplicationRequirements.verify!() == :ok
     end
   end
diff --git a/test/pleroma/emails/mailer_test.exs b/test/pleroma/emails/mailer_test.exs
index 7a718c653..947eecdbc 100644
--- a/test/pleroma/emails/mailer_test.exs
+++ b/test/pleroma/emails/mailer_test.exs
@@ -3,9 +3,12 @@
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Emails.MailerTest do
-  use Pleroma.DataCase
-  alias Pleroma.Emails.Mailer
+  use Pleroma.DataCase, async: true
 
+  alias Pleroma.Emails.Mailer
+  alias Pleroma.UnstubbedConfigMock, as: ConfigMock
+
+  import Mox
   import Swoosh.TestAssertions
 
   @email %Swoosh.Email{
@@ -14,10 +17,22 @@ defmodule Pleroma.Emails.MailerTest do
     subject: "Pleroma test email",
     to: [{"Test User", "user1@example.com"}]
   }
-  setup do: clear_config([Pleroma.Emails.Mailer, :enabled], true)
+
+  setup do
+    ConfigMock
+    |> stub(:get, fn
+      [Mailer, :enabled] -> true
+    end)
+
+    :ok
+  end
 
   test "not send email when mailer is disabled" do
-    clear_config([Pleroma.Emails.Mailer, :enabled], false)
+    ConfigMock
+    |> stub(:get, fn
+      [Mailer, :enabled] -> false
+    end)
+
     Mailer.deliver(@email)
     :timer.sleep(100)
 
diff --git a/test/pleroma/user/welcome_email_test.exs b/test/pleroma/user/welcome_email_test.exs
index a7b932c7e..9c070c117 100644
--- a/test/pleroma/user/welcome_email_test.exs
+++ b/test/pleroma/user/welcome_email_test.exs
@@ -14,6 +14,11 @@ defmodule Pleroma.User.WelcomeEmailTest do
 
   setup do: clear_config([:welcome])
 
+  setup do
+    Mox.stub_with(Pleroma.UnstubbedConfigMock, Pleroma.Test.StaticConfig)
+    :ok
+  end
+
   describe "send_email/1" do
     test "send a welcome email" do
       user = insert(:user, name: "Jimm")
diff --git a/test/pleroma/web/admin_api/controllers/admin_api_controller_test.exs b/test/pleroma/web/admin_api/controllers/admin_api_controller_test.exs
index a7ee8359d..5742c4c16 100644
--- a/test/pleroma/web/admin_api/controllers/admin_api_controller_test.exs
+++ b/test/pleroma/web/admin_api/controllers/admin_api_controller_test.exs
@@ -991,7 +991,11 @@ test "it requires privileged role :users_manage_credentials", %{conn: conn} do
 
   describe "PATCH /resend_confirmation_email" do
     test "it resend emails for two users", %{conn: conn, admin: admin} do
+      ConfigMock
+      |> Mox.stub_with(Pleroma.Test.StaticConfig)
+
       clear_config([:instance, :admin_privileges], [:users_manage_credentials])
+
       [first_user, second_user] = insert_pair(:user, is_confirmed: false)
 
       ret_conn =
@@ -1079,7 +1083,7 @@ test "it requires privileged role :statistics_read", %{conn: conn} do
   describe "/api/pleroma/backups" do
     test "it creates a backup", %{conn: conn} do
       ConfigMock
-      |> Mox.stub_with(Pleroma.Config)
+      |> Mox.stub_with(Pleroma.Test.StaticConfig)
 
       admin = %{id: admin_id, nickname: admin_nickname} = insert(:user, is_admin: true)
       token = insert(:oauth_admin_token, user: admin)
diff --git a/test/pleroma/web/admin_api/controllers/invite_controller_test.exs b/test/pleroma/web/admin_api/controllers/invite_controller_test.exs
index 8051cb2e9..bfb9304f8 100644
--- a/test/pleroma/web/admin_api/controllers/invite_controller_test.exs
+++ b/test/pleroma/web/admin_api/controllers/invite_controller_test.exs
@@ -5,9 +5,11 @@
 defmodule Pleroma.Web.AdminAPI.InviteControllerTest do
   use Pleroma.Web.ConnCase, async: false
 
+  import Mox
   import Pleroma.Factory
 
   alias Pleroma.Repo
+  alias Pleroma.UnstubbedConfigMock, as: ConfigMock
   alias Pleroma.UserInviteToken
 
   setup do
@@ -19,6 +21,9 @@ defmodule Pleroma.Web.AdminAPI.InviteControllerTest do
       |> assign(:user, admin)
       |> assign(:token, token)
 
+    ConfigMock
+    |> stub_with(Pleroma.Test.StaticConfig)
+
     {:ok, %{admin: admin, token: token, conn: conn}}
   end
 
diff --git a/test/pleroma/web/pleroma_api/controllers/account_controller_test.exs b/test/pleroma/web/pleroma_api/controllers/account_controller_test.exs
index 8f000760f..d1f92cc11 100644
--- a/test/pleroma/web/pleroma_api/controllers/account_controller_test.exs
+++ b/test/pleroma/web/pleroma_api/controllers/account_controller_test.exs
@@ -5,11 +5,13 @@
 defmodule Pleroma.Web.PleromaAPI.AccountControllerTest do
   use Pleroma.Web.ConnCase
 
-  alias Pleroma.Config
+  alias Pleroma.Test.StaticConfig, as: Config
   alias Pleroma.Tests.ObanHelpers
+  alias Pleroma.UnstubbedConfigMock, as: ConfigMock
   alias Pleroma.User
   alias Pleroma.Web.CommonAPI
 
+  import Mox
   import Pleroma.Factory
   import Swoosh.TestAssertions
 
@@ -25,7 +27,15 @@ defmodule Pleroma.Web.PleromaAPI.AccountControllerTest do
       [user: user]
     end
 
-    setup do: clear_config([:instance, :account_activation_required], true)
+    setup do
+      ConfigMock
+      |> stub(:get, fn
+        [:instance, :account_activation_required] -> true
+        path -> Config.get(path)
+      end)
+
+      :ok
+    end
 
     test "resend account confirmation email", %{conn: conn, user: user} do
       conn
diff --git a/test/pleroma/web/twitter_api/password_controller_test.exs b/test/pleroma/web/twitter_api/password_controller_test.exs
index 26cca1345..af8b5d852 100644
--- a/test/pleroma/web/twitter_api/password_controller_test.exs
+++ b/test/pleroma/web/twitter_api/password_controller_test.exs
@@ -11,9 +11,15 @@ defmodule Pleroma.Web.TwitterAPI.PasswordControllerTest do
   alias Pleroma.Tests.ObanHelpers
   alias Pleroma.User
   alias Pleroma.Web.OAuth.Token
+
   import Pleroma.Factory
   import Swoosh.TestAssertions
 
+  setup do
+    Mox.stub_with(Pleroma.UnstubbedConfigMock, Pleroma.Test.StaticConfig)
+    :ok
+  end
+
   describe "GET /api/pleroma/password_reset/token" do
     test "it returns error when token invalid", %{conn: conn} do
       response =
diff --git a/test/pleroma/web/twitter_api/twitter_api_test.exs b/test/pleroma/web/twitter_api/twitter_api_test.exs
index b3cd80146..0aa2e81ee 100644
--- a/test/pleroma/web/twitter_api/twitter_api_test.exs
+++ b/test/pleroma/web/twitter_api/twitter_api_test.exs
@@ -16,6 +16,11 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPITest do
     :ok
   end
 
+  setup do
+    Mox.stub_with(Pleroma.UnstubbedConfigMock, Pleroma.Test.StaticConfig)
+    :ok
+  end
+
   test "it registers a new user and returns the user." do
     data = %{
       :username => "lain",
@@ -48,6 +53,10 @@ test "it registers a new user with empty string in bio and returns the user" do
   test "it sends confirmation email if :account_activation_required is specified in instance config" do
     clear_config([:instance, :account_activation_required], true)
 
+    Pleroma.UnstubbedConfigMock
+    |> Mox.expect(:get, fn [:instance, :account_activation_required] -> true end)
+    |> Mox.expect(:get, fn [Pleroma.Emails.Mailer, :enabled] -> true end)
+
     data = %{
       :username => "lain",
       :email => "lain@wired.jp",
@@ -64,8 +73,8 @@ test "it sends confirmation email if :account_activation_required is specified i
 
     email = Pleroma.Emails.UserEmail.account_confirmation_email(user)
 
-    notify_email = Pleroma.Config.get([:instance, :notify_email])
-    instance_name = Pleroma.Config.get([:instance, :name])
+    notify_email = Pleroma.Test.StaticConfig.get([:instance, :notify_email])
+    instance_name = Pleroma.Test.StaticConfig.get([:instance, :name])
 
     Swoosh.TestAssertions.assert_email_sent(
       from: {instance_name, notify_email},