diff --git a/test/unit/helpers/activities_helper_test.rb b/test/unit/helpers/activities_helper_test.rb
index e7785dde4..47c0b6c0b 100644
--- a/test/unit/helpers/activities_helper_test.rb
+++ b/test/unit/helpers/activities_helper_test.rb
@@ -19,6 +19,7 @@ require File.expand_path('../../../test_helper', __FILE__)
 
 class ActivitiesHelperTest < ActionView::TestCase
   include ActivitiesHelper
+  include Redmine::I18n
 
   class MockEvent
     attr_reader :event_datetime, :event_group, :name
diff --git a/test/unit/helpers/application_helper_test.rb b/test/unit/helpers/application_helper_test.rb
index ab52017ff..d2c17a115 100644
--- a/test/unit/helpers/application_helper_test.rb
+++ b/test/unit/helpers/application_helper_test.rb
@@ -20,6 +20,7 @@
 require File.expand_path('../../../test_helper', __FILE__)
 
 class ApplicationHelperTest < ActionView::TestCase
+  include Redmine::I18n
   include ERB::Util
   include Rails.application.routes.url_helpers
 
@@ -96,7 +97,7 @@ class ApplicationHelperTest < ActionView::TestCase
   if 'ruby'.respond_to?(:encoding)
     def test_auto_links_with_non_ascii_characters
       to_test = {
-        'http://foo.bar/тест' => '<a class="external" href="http://foo.bar/тест">http://foo.bar/тест</a>'
+        'http://foo.bar/те�т' => '<a class="external" href="http://foo.bar/те�т">http://foo.bar/те�т</a>'
       }
       to_test.each { |text, result| assert_equal "<p>#{result}</p>", textilizable(text) }
     end
@@ -250,7 +251,7 @@ RAW
   if 'ruby'.respond_to?(:encoding)
     def test_textile_external_links_with_non_ascii_characters
       to_test = {
-        'This is a "link":http://foo.bar/тест' => 'This is a <a href="http://foo.bar/тест" class="external">link</a>'
+        'This is a "link":http://foo.bar/те�т' => 'This is a <a href="http://foo.bar/те�т" class="external">link</a>'
       }
       to_test.each { |text, result| assert_equal "<p>#{result}</p>", textilizable(text) }
     end
@@ -596,7 +597,7 @@ RAW
       '[[CookBook documentation#One-section]]' => '<a href="/projects/ecookbook/wiki/CookBook_documentation#One-section" class="wiki-page">CookBook documentation</a>',
       '[[Another page#anchor|Page]]' => '<a href="/projects/ecookbook/wiki/Another_page#anchor" class="wiki-page">Page</a>',
       # UTF8 anchor
-      '[[Another_page#Тест|Тест]]' => %|<a href="/projects/ecookbook/wiki/Another_page##{CGI.escape 'Тест'}" class="wiki-page">Тест</a>|,
+      '[[Another_page#Те�т|Те�т]]' => %|<a href="/projects/ecookbook/wiki/Another_page##{CGI.escape 'Те�т'}" class="wiki-page">Те�т</a>|,
       # page that doesn't exist
       '[[Unknown page]]' => '<a href="/projects/ecookbook/wiki/Unknown_page" class="wiki-page new">Unknown page</a>',
       '[[Unknown page|404]]' => '<a href="/projects/ecookbook/wiki/Unknown_page" class="wiki-page new">404</a>',
diff --git a/test/unit/helpers/issues_helper_test.rb b/test/unit/helpers/issues_helper_test.rb
index 172ec69fc..327ca0710 100644
--- a/test/unit/helpers/issues_helper_test.rb
+++ b/test/unit/helpers/issues_helper_test.rb
@@ -19,6 +19,7 @@ require File.expand_path('../../../test_helper', __FILE__)
 
 class IssuesHelperTest < ActionView::TestCase
   include ApplicationHelper
+  include Redmine::I18n
   include IssuesHelper
   include CustomFieldsHelper
   include ERB::Util
diff --git a/test/unit/helpers/projects_helper_test.rb b/test/unit/helpers/projects_helper_test.rb
index c8fe57452..7661925a6 100644
--- a/test/unit/helpers/projects_helper_test.rb
+++ b/test/unit/helpers/projects_helper_test.rb
@@ -20,6 +20,7 @@ require File.expand_path('../../../test_helper', __FILE__)
 class ProjectsHelperTest < ActionView::TestCase
   include ApplicationHelper
   include ProjectsHelper
+  include Redmine::I18n
   include ERB::Util
 
   fixtures :projects, :trackers, :issue_statuses, :issues,
diff --git a/test/unit/helpers/queries_helper_test.rb b/test/unit/helpers/queries_helper_test.rb
index 3cb5d1373..63d8a6852 100644
--- a/test/unit/helpers/queries_helper_test.rb
+++ b/test/unit/helpers/queries_helper_test.rb
@@ -19,6 +19,7 @@ require File.expand_path('../../../test_helper', __FILE__)
 
 class QueriesHelperTest < ActionView::TestCase
   include QueriesHelper
+  include Redmine::I18n
 
   fixtures :projects, :enabled_modules, :users, :members,
            :member_roles, :roles, :trackers, :issue_statuses,
diff --git a/test/unit/helpers/search_helper_test.rb b/test/unit/helpers/search_helper_test.rb
index 204f306b2..c7c94d4e5 100644
--- a/test/unit/helpers/search_helper_test.rb
+++ b/test/unit/helpers/search_helper_test.rb
@@ -21,6 +21,7 @@ require File.expand_path('../../../test_helper', __FILE__)
 
 class SearchHelperTest < ActionView::TestCase
   include SearchHelper
+  include Redmine::I18n
   include ERB::Util
 
   def test_highlight_single_token
diff --git a/test/unit/helpers/sort_helper_test.rb b/test/unit/helpers/sort_helper_test.rb
index 69df0117f..a80aba1b9 100644
--- a/test/unit/helpers/sort_helper_test.rb
+++ b/test/unit/helpers/sort_helper_test.rb
@@ -19,6 +19,7 @@ require File.expand_path('../../../test_helper', __FILE__)
 
 class SortHelperTest < ActionView::TestCase
   include SortHelper
+  include Redmine::I18n
   include ERB::Util
 
   def setup
diff --git a/test/unit/helpers/timelog_helper_test.rb b/test/unit/helpers/timelog_helper_test.rb
index ee29957f5..0396360d2 100644
--- a/test/unit/helpers/timelog_helper_test.rb
+++ b/test/unit/helpers/timelog_helper_test.rb
@@ -19,6 +19,7 @@ require File.expand_path('../../../test_helper', __FILE__)
 
 class TimelogHelperTest < ActionView::TestCase
   include TimelogHelper
+  include Redmine::I18n
   include ActionView::Helpers::TextHelper
   include ActionView::Helpers::DateHelper
   include ERB::Util