diff --git a/tests/i18n/I18NTest.php b/tests/i18n/I18NTest.php
new file mode 100644
index 0000000..c2652c9
--- /dev/null
+++ b/tests/i18n/I18NTest.php
@@ -0,0 +1,187 @@
+<?php
+
+/*
+ * @copyright NetMonsters <team@netmonsters.ru>
+ * @link http://netmonsters.ru
+ * @package Majestic
+ * @subpackage UnitTests
+ * @since 2011-10-31
+ * 
+ * Unit tests for I18N class
+ */
+
+require_once dirname(__FILE__) . '/../../Registry.php';
+require_once dirname(__FILE__) . '/../../Config.php';
+require_once dirname(__FILE__) . '/../../classes/Env.class.php';
+require_once dirname(__FILE__) . '/../../i18n/I18N.php';
+
+/**
+ * @runTestsInSeparateProcesses
+ */
+class I18NTest extends PHPUnit_Framework_TestCase
+{
+
+    public function run(PHPUnit_Framework_TestResult $result = NULL)
+    {
+        $this->setPreserveGlobalState(false);
+        return parent::run($result);
+    }
+
+    /**
+     * @runInSeparateProcess
+     */
+    public function testInit()
+    {
+        $this->setConstants();
+        Config::set('I18N', array('locales' => array('ru' => 'ru-ru', 'us' => 'en-us')));
+
+        I18N::init();
+        $this->assertAttributeEquals(array('ru' => 'ru-ru', 'us' => 'en-us'), 'locales', 'I18N');
+        $this->assertAttributeEquals('ru-ru', 'locale', 'I18N');
+    }
+
+    /**
+     * @expectedException Exception
+     */
+    public function testInitNoConfig()
+    {
+        I18N::init();
+    }
+
+    /**
+     * @runInSeparateProcess
+     */
+    public function testInitFullConfig()
+    {
+        $this->setConstants();
+
+        Config::set('I18N', array('locales' => array('ru' => 'ru-ru', 'en' => 'en_US'), 'bidi' => 'bidivalue', 'default' => 'ru'));
+        I18N::init();
+        $this->assertAttributeEquals('ru-ru', 'locale', 'I18N');
+        $this->assertAttributeEquals('bidivalue', 'bidi', 'I18N');
+        $this->assertAttributeEquals('ru', 'default', 'I18N');
+    }
+
+    /**
+     * @runInSeparateProcess
+     */
+    public function testInitPostLangSet()
+    {
+        $this->setConstants();
+
+        $_POST['lang'] = 'en';
+        $_COOKIE['lang'] = 'en';
+        Config::set('I18N', array('locales' => array('ru' => 'ru-ru', 'en' => 'en_US'), 'bidi' => 'bidivalue', 'default' => 'ru'));
+
+        set_exit_overload(function() { return FALSE; });
+
+        I18N::init();
+        $this->assertAttributeEquals('en_US', 'locale', 'I18N');
+        unset_exit_overload();
+    }
+
+    /**
+     * @runInSeparateProcess
+     * @expectedException PHPUnit_Framework_Error
+     */
+    public function testInitSetDefaultLangNotInLocales()
+    {
+        $this->setConstants();
+
+        Config::set('I18N', array('locales' => array('rus' => 'ru_RU'), 'default' => 'ru'));
+        I18N::init();
+        $this->assertAttributeEquals('ru_RU', 'locale', 'I18N');
+    }
+
+    /**
+     * @runInSeparateProcess
+     */
+    public function testInitServerLangConfigured()
+    {
+        $this->setConstants();
+        $_SERVER['HTTP_ACCEPT_LANGUAGE'] = 'ru';
+
+        Config::set('I18N', array('locales' => array('ru_ru' => 'ru_RU', 'ru' => 'ru-ru', 'us' => 'en-us')));
+        I18N::init();
+        $this->assertAttributeEquals('ru-ru', 'locale', 'I18N');
+    }
+
+    /**
+     * @runInSeparateProcess
+     */
+    public function testInitServerLangConfiguredWithWeights()
+    {
+        $this->setConstants();
+        $_SERVER['HTTP_ACCEPT_LANGUAGE'] = 'ru-ru,ru;q=0.8,en-us;q=0.5,en;q=0.3';
+
+        Config::set('I18N', array('locales' => array('en_US' => 'en-us')));
+        I18N::init();
+        $this->assertAttributeEquals('en-us', 'locale', 'I18N');
+    }
+
+    /**
+     * @runInSeparateProcess
+     */
+    public function testInitServerLangConfiguredWithWeightsNoLocale()
+    {
+        $this->setConstants();
+        $_SERVER['HTTP_ACCEPT_LANGUAGE'] = 'ru-ru,ru;q=0.8,en-us;q=0.5,en;q=0.3';
+
+        Config::set('I18N', array('locales' => array('en' => 'en_US')));
+        I18N::init();
+        $this->assertAttributeEquals('en_US', 'locale', 'I18N');
+    }
+
+    /**
+     * @runInSeparateProcess
+     */
+    public function testGetLang()
+    {
+        $this->setConstants();
+        $_SERVER['HTTP_ACCEPT_LANGUAGE'] = 'ru-ru,ru;q=0.8,en-us;q=0.5,en;q=0.3';
+
+        Config::set('I18N', array('locales' => array('en' => 'en_US'), 'default' => 'ru'));
+        I18N::init();
+        $this->assertEquals('en', I18N::getLang());
+        $this->assertEquals('ru', I18N::getDefaultLang());
+    }
+
+    /**
+     * @runInSeparateProcess
+     */
+    public function testLangs()
+    {
+        $this->setConstants();
+        $_SERVER['HTTP_ACCEPT_LANGUAGE'] = 'ru-ru,ru;q=0.8,en-us;q=0.5,en;q=0.3';
+
+        Config::set('I18N', array('locales' => array('ru' => 'ru-ru'), 'default' => 'ru'));
+        I18N::init();
+        I18N::setLangs(array('en' => 'en-us', 'fr' => 'fr-fr'));
+        $this->assertEquals(array('en' => 'en-us', 'fr' => 'fr-fr'), I18N::getLangs());
+    }
+
+    /**
+     * @runInSeparateProcess
+     */
+    public function testLangName()
+    {
+        $this->setConstants();
+        $_SERVER['HTTP_ACCEPT_LANGUAGE'] = 'ru-ru,ru;q=0.8,en-us;q=0.5,en;q=0.3';
+
+        Config::set('I18N', array('locales' => array('ru' => 'ru-ru'), 'default' => 'ru'));
+        I18N::init();
+        I18N::setLangs(array('ru' => 'ru_ru', 'en' => 'en-us', 'fr' => 'fr-fr'));
+        $this->assertEquals('ru_ru', I18N::getLangName());
+        $this->assertFalse(I18N::getLangName('br'));
+    }
+
+    private function setConstants()
+    {
+        if (!defined('PATH')) {
+            define('PATH', '/some/path/');
+        }
+        if (!defined('APP')) {
+            define('APP', '/some/app/');
+        }
+    }
+}
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