diff --git a/test/functional/my_controller_test.rb b/test/functional/my_controller_test.rb
index f9e17e5..8b27e66 100644
--- a/test/functional/my_controller_test.rb
+++ b/test/functional/my_controller_test.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require_relative '../test_helper'
+require File.expand_path '../../test_helper', __FILE__
 
 class MyControllerTest < RedmineSudo::ControllerTest
   fixtures :users, :email_addresses, :user_preferences, :roles, :projects, :members, :member_roles,
diff --git a/test/functional/users_controller_test.rb b/test/functional/users_controller_test.rb
index 133b99e..c95ec86 100644
--- a/test/functional/users_controller_test.rb
+++ b/test/functional/users_controller_test.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require_relative '../test_helper'
+require File.expand_path '../../test_helper', __FILE__
 
 class UsersControllerTest < RedmineSudo::ControllerTest
   fixtures :users, :email_addresses, :groups_users, :roles, :user_preferences,
diff --git a/test/test_helper.rb b/test/test_helper.rb
index da61f4a..ecf90f1 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -13,7 +13,7 @@
   end
 end
 
-require_relative '../../../test/test_helper'
+require File.expand_path "#{File.dirname __FILE__}/../../../test/test_helper"
 
 module RedmineSudo
   module TestHelper
diff --git a/test/unit/i18n_test.rb b/test/unit/i18n_test.rb
index a86ba28..7b9ad07 100644
--- a/test/unit/i18n_test.rb
+++ b/test/unit/i18n_test.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require_relative '../test_helper'
+require File.expand_path '../../test_helper', __FILE__
 
 class I18nTest < RedmineSudo::TestCase
   include Redmine::I18n
@@ -19,7 +19,7 @@ def test_valid_languages
   end
 
   def test_locales_validness
-    lang_files_count = Rails.root.glob('plugins/additionals/config/locales/*.yml').size
+    lang_files_count = Rails.root.glob('plugins/redmine_sudo/config/locales/*.yml').size
 
     assert_equal 9, lang_files_count
     valid_languages.each do |lang|
diff --git a/test/unit/user_test.rb b/test/unit/user_test.rb
index 16bb671..0344cef 100644
--- a/test/unit/user_test.rb
+++ b/test/unit/user_test.rb
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-require_relative '../test_helper'
+require File.expand_path '../../test_helper', __FILE__
 
 class UserTest < RedmineSudo::TestCase
   fixtures :users, :groups_users, :email_addresses, :user_preferences,