Updated sub_language added only one function

tests/main/admin/sub_language.class.test.php

@@ -1,4 +1,23 @@
 <?php
+require_once(api_get_path(SYS_CODE_PATH).'admin/sub_language.class.php');
 
-
+class TestSubLanguageManager extends UnitTestCase {
+	
+	   
+    /**
+     * Add directory for sub-language 
+     * @param String The sub-language path directory ( /var/www/my_dokeos/main/lang/spanish_corporate )
+     * @return boolean
+     */	 
+     public static function testadd_directory_of_sub_language() {
+     	$path_sub_language='/var/www/nose';
+     	$res=SubLanguageManager::add_directory_of_sub_language($path_sub_language);
+     	$this->assertTrue(is_bool($path_sub_language));
+     	var_dump($res);
+     }
+    
+    
+		
+	
+}
 ?>