diff --git a/test/functional/application_controller_test.rb b/test/functional/application_controller_test.rb
new file mode 100644
index 0000000..014523a
--- /dev/null
+++ b/test/functional/application_controller_test.rb
@@ -0,0 +1,38 @@
+# redMine - project management software
+# Copyright (C) 2006-2007  Jean-Philippe Lang
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+require File.dirname(__FILE__) + '/../test_helper'
+require 'application'
+
+# Re-raise errors caught by the controller.
+class ApplicationController; def rescue_action(e) raise e end; end
+
+class ApplicationControllerTest < Test::Unit::TestCase
+  def setup
+    @controller = ApplicationController.new
+    @request    = ActionController::TestRequest.new
+    @response   = ActionController::TestResponse.new
+  end
+
+  # check that all 4 supported languages are valid
+  def test_localization
+    assert_equal 4, GLoc.valid_languages.size
+    GLoc.valid_languages.each do |lang|
+      assert set_language_if_valid(lang)
+    end
+  end
+end