diff --git a/include/class/acc_bilan.class.php b/include/class/acc_bilan.class.php
index d39780f54..4993b1453 100644
--- a/include/class/acc_bilan.class.php
+++ b/include/class/acc_bilan.class.php
@@ -335,7 +335,7 @@ class Acc_Bilan
         }
         catch(Exception $Ex)
         {
-            record_log($e);
+            record_log($Ex);
             echo $Ex->getMessage();
             throw $Ex;
         }
@@ -437,7 +437,7 @@ class Acc_Bilan
 	    $zip->close();
 	  } else
 	  {
-	    echo __FILE__.":".__LINE__."cannot unzip model ".$filename;
+	    echo __FILE__.":".__LINE__."cannot unzip model ".$file_base;
 	  }
 
 	ob_end_clean();
@@ -738,7 +738,7 @@ class Acc_Bilan
 	      }
 	    else
 	      {
-		echo __FILE__.":".__LINE__."cannot unzip model ".$filename;
+		echo __FILE__.":".__LINE__."cannot unzip model ".$file_base;
 	      }
 
             // Remove the file we do  not need anymore
diff --git a/include/class/extension.class.php b/include/class/extension.class.php
index bf60cbdad..6f1cdacf5 100644
--- a/include/class/extension.class.php
+++ b/include/class/extension.class.php
@@ -253,7 +253,7 @@ class Extension extends Menu_Ref_sql
     }
 
     /**
-     * remove all the schema from the plugins
+     * @brief remove all the standard  plugins schema
      * @param Database $p_cn
      */
     static function clean(Database $p_cn)
@@ -269,7 +269,7 @@ class Extension extends Menu_Ref_sql
     }
 
     /**
-     * compare the version of the plugin and the last version , propose to update it if a new version exists
+     * @brief compare the version of the plugin and the last version , propose to update it if a new version exists
      * @todo add a mechanism to check once a day
      * @global User $g_user
      * @global number $version_plugin
@@ -327,6 +327,9 @@ class Extension extends Menu_Ref_sql
                     throw new Exception(_('Manque répertoire racine'), 1);
                 if (!isset($xml->plugin[$i]->file))
                     throw new Exception(_('Manque fichier à inclure'), 1);
+                if (!isset($xml->plugin[$i]->version))
+                    throw new Exception(_("Manque version de l'extension"), 1);
+
                 if (!isset($xml->plugin[$i]->depend))
                     $xml->plugin[$i]->depend="EXT";
                 if (!isset($xml->plugin[$i]->order))
@@ -340,8 +343,9 @@ class Extension extends Menu_Ref_sql
     }
 
     /**
-     * Parse a XML file to complete an array of extension objects
-     * @brief Create extension from XML.
+     * @brief Parse a XML file to complete an array of extension objects, in the plugin.xml file , you can find
+     * several plugins sharing some parts.
+     *
      * @param string $p_file filename
      * @return array  array of Extension
      */
@@ -363,7 +367,7 @@ class Extension extends Menu_Ref_sql
             }
             catch (Exception $ex)
             {
-                echo_warning($e->getMessage());
+                echo_warning($ex->getMessage());
                 if ($ex->getCode()==1)
                 {
                     continue;
@@ -378,14 +382,46 @@ class Extension extends Menu_Ref_sql
             $extension->me_parameter='plugin_code='.trim($xml->plugin[$i]->code);
             $extension->depend=(isset($xml->plugin[$i]->depend))?trim($xml->plugin[$i]->depend):"EXT";
             $extension->order=(isset($xml->plugin[$i]->order))?trim($xml->plugin[$i]->order):9000;
+            $extension->version=trim($xml->plugin[$i]->version);
+            $extension->noalyss_version=(isset($xml->plugin[$i]->noalyss_version))?trim($xml->plugin[$i]->noalyss_version):8000;
             $a_extension[]=clone $extension;
         }
         return $a_extension;
     }
 
+    /**
+     * @brief find the extension with the me_code = last part of access_code
+     * @param $a_extension
+     * @param $access_code find the ME_CODE (normally last part )
+     * @return the extension or null
+     */
+    public static function find_extension_code($a_extension,$access_code):Extension|null
+    {
+        $a_me_code=explode("/", $access_code);
+        if (empty($a_me_code ) ) return null;
+        $nb_me_code=count($a_me_code);
+        $me_code=$a_me_code[$nb_me_code-1];
+        foreach ($a_extension as $extension) {
+            if ($extension->me_code==$me_code) return $extension;
+        }
+        return null;
+    }
+
     public function __toString(): string
     {
-        return "Extension";
+        $r = "";
+        $r .= "  me_code " . $this->me_code.PHP_EOL;
+        $r .= "  me_menu.".$this->me_menu.PHP_EOL;
+        $r .= "  version".$this->version.PHP_EOL;
+        $r .= "  noalyss_version".$this->noalyss_version.PHP_EOL;
+        $r .= "  me_file" . $this->me_file.PHP_EOL;
+        $r .= "  me_url" . $this->me_url.PHP_EOL;
+        $r .= "  me_description" . $this->me_description.PHP_EOL;
+        $r .= "  me_parameter" . $this->me_parameter.PHP_EOL;
+        $r .= "  me_javascript" . $this->me_javascript.PHP_EOL;
+        $r .= "  me_type" . $this->me_type.PHP_EOL;
+        $r .= "  me_descrition_etendue" . $this->me_description_etendue.PHP_EOL;
+        return "Extension $r";
     }
 
 
diff --git a/include/verif_bilan.inc.php b/include/verif_bilan.inc.php
index 05e90e595..bff0737ec 100644
--- a/include/verif_bilan.inc.php
+++ b/include/verif_bilan.inc.php
@@ -175,9 +175,10 @@ having count(*) > 1
         
         </li>
         <ul>
-        <?php $all_dep=Database::fetch_all($poste); 
+        <?php
+        $all_dep=Database::fetch_all($poste);
         $nb_dep = ($all_dep == FALSE ) ? 0 :count($all_dep);
-        for ($e=0;$e<count($nb_dep);$e++):
+        for ($e=0;$e<$nb_dep;$e++):
         ?>
             <li>
                 <?php echo HtmlInput::history_account($all_dep[$e]['j_poste'],$all_dep[$e]['j_poste'],' display:inline ')?>
diff --git a/unit-test/include/class/data/plugin.xml b/unit-test/include/class/data/plugin.xml
new file mode 100644
index 000000000..669eb6fc9
--- /dev/null
+++ b/unit-test/include/class/data/plugin.xml
@@ -0,0 +1,86 @@
+<?xml version="1.0" encoding="UTF-8"?><!--
+/*
+ *   This file is part of NOALYSS.
+ *
+ *   NOALYSS 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.
+ *
+ *   NOALYSS 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 NOALYSS; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+// Copyright  (c) 2002-2014 Author Dany De Bontridder danydb@aevalys.eu
+-->
+<plugins>
+    <plugin>
+        <name>
+            Skeleton for plugin
+        </name>
+        <description>
+            Example of an XML File for developing a plugin.
+
+        </description>
+        <code>
+            SKEL
+        </code>
+        <root>
+            skel
+        </root>
+        <file>
+            index.php
+        </file>
+        <author>
+            Dany De Bontridder
+        </author>
+        <noalyss_version>9000</noalyss_version>
+        <order>
+            9000
+        </order>
+        <depend>
+            EXT
+        </depend>
+        <schema>
+            skeleton
+        </schema>
+        <version>2000</version>
+    </plugin>
+    <plugin>
+        <name>
+            Second Skeleton for plugin
+        </name>
+        <description>
+            Example of an XML File for developing a plugin.
+            Second plugin inside
+        </description>
+        <code>
+            PLUGIN_TEST
+        </code>
+        <root>
+            skel
+        </root>
+        <file>
+            index-plugin_test.php
+        </file>
+        <author>
+            Dany De Bontridder
+        </author>
+        <noalyss_version>8111</noalyss_version>
+        <order>
+            9000
+        </order>
+        <depend>
+            EXT
+        </depend>
+        <schema>
+            skeleton
+        </schema>
+        <version>9019</version>
+    </plugin>
+</plugins>
\ No newline at end of file
diff --git a/unit-test/include/class/extensiontest.php b/unit-test/include/class/extensiontest.php
new file mode 100644
index 000000000..e4dbb73f6
--- /dev/null
+++ b/unit-test/include/class/extensiontest.php
@@ -0,0 +1,139 @@
+<?php
+
+/*
+ * * Copyright (C) 2022 Dany De Bontridder <dany@alchimerys.be>
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * 
+ * Author : Dany De Bontridder danydb@noalyss.eu $(DATE)
+ */
+
+/**
+ * @file
+ * @brief noalyss
+ */
+
+use PHPUnit\Framework\TestCase;
+
+require DIRTEST . '/global.php';
+
+/**
+ * @testdox Class ExtensionTest : used for ...
+ * @backupGlobals enabled
+ * @coversDefaultClass
+ */
+class ExtensionTest extends TestCase
+{
+
+    /**
+     * @var Fiche
+     */
+    protected $object;
+    protected $connection;
+
+    /**
+     * Sets up the fixture, for example, opens a network connection.
+     * This method is called before a test method is executed.
+     */
+    protected function setUp(): void
+    {
+
+
+    }
+
+    /**
+     * Tears down the fixture, for example, closes a network connection.
+     * This method is called after a test method is executed.
+     */
+    protected function tearDown(): void
+    {
+        /**
+         * example
+         * if ( ! is_object($this->object->fiche_def)) return;
+         * include_once DIRTEST.'/global.php';
+         * $g_connection=Dossier::connect();
+         * $sql=new ArrayObject();
+         * $sql->append("delete from fiche_detail where f_id in (select f_id from fiche where fd_id =\$1 )");
+         * $sql->append("delete from fiche where f_id not in (select f_id from fiche_detail where \$1=\$1)");
+         * $sql->append("delete from jnt_fic_attr where fd_id  = \$1 ");
+         * $sql->append("delete from fiche_def where fd_id = \$1");
+         * foreach ($sql as $s) {
+         * $g_connection->exec_sql($s,[$this->object->fiche_def->id]);
+         * }
+         */
+    }
+
+    /**
+     * the setUpBeforeClass() template methods is called before the first test of the test case
+     *  class is run
+     */
+    public static function setUpBeforeClass(): void
+    {
+        //        include 'global.php';
+    }
+
+    /**
+     *  tearDownAfterClass() template methods is calleafter the last test of the test case class is run,
+     *
+     */
+    static function tearDownAfterClass(): void
+    {
+        //        include 'global.php';
+    }
+//
+//    public function dataExample()
+//    {
+//        return array([1], [2], [3]);
+//    }
+
+    /**
+     * @testdox check the load of plugin and find the  plugin from an access_code
+     * @covers \Extension::find_extension_code \Extension:read_definition , \Extension::verify
+     * @backupGlobals  on
+     */
+    function testFind_extension_file()
+    {
+        global $cn;
+        require DIRTEST . '/global.php';
+        $cn=$g_connection;
+        $a_extension=\Extension::read_definition(__DIR__."/data/plugin.xml");
+        $access_code="EXT/TOOLS/PLUGIN_TEST";
+        $extension=\Extension::find_extension_code($a_extension, $access_code);
+
+        $this->assertTrue($extension->me_file=="skel/index-plugin_test.php");
+        $this->assertTrue($extension->version==9019, " ne peut retrouver la version");
+        $this->assertTrue($extension->noalyss_version==8111," ne peut pas retrouver la version de noalyss");
+    }
+
+    /**
+     * @testdox check the load of plugin and find the  plugin from an access_code
+     * @covers \Extension::find_extension_code \Extension:read_definition\Extension::verify
+     * @backupGlobals  on
+     */
+    function testFind_extension_version()
+    {
+        global $cn;
+        require DIRTEST . '/global.php';
+        $cn=$g_connection;
+        $a_extension=\Extension::read_definition(__DIR__."/data/plugin.xml");
+        $access_code="EXT/TOOLS/SKEL";
+        $extension=\Extension::find_extension_code($a_extension, $access_code);
+
+        $this->assertTrue($extension->version==2000, " ne peut retrouver la version");
+        $this->assertTrue($extension->noalyss_version==9000," ne peut pas retrouver la version de noalyss");
+
+    }
+}
\ No newline at end of file