Zend FR

Fatal error: class 'Zend_Db_Table' not found in '.../entites.php' line 3.

<?php

require_once 'PHPUnit/Framework/TestCase.php';
require '../../../application/models/DbTable/Entites.php';

class EntitesTest extends PHPUnit_Framework_TestCase
{
    
    private $_entite;
    
    public function setUp()
    {
        $this->_entite = new Model_DbTable_Entites();
    }
    
    public function tearDown()
    {
        /* Tear Down Routine */
    }    
    
    public function testConstructeur()
    {
        $this->assertTrue(isset($this->_entite));
        
    }
    
    public function testCrud()
    {
        $nb1 = $this->_entite->fetchAll()->count();
        $this->_entite->ajouterEntite('xxxx');
        $nb2 = $this->_entite->fetchAll()->count();
        $this->assertTrue($nb2-$nb1=1);
        $id = $this->_entite->fetchAll('select Id_Entite from entite where Nom_Entite = \'xxxx\'');
        $obj = $this->_entite->getEntite($id);
        $this->assertTrue($obj[Nom_Entite]='xxxx');
        if(($this->assertEqual($obj[Nom_Entite],'xxxx'))==true){
            $this->_entite->editerEntite($id,'yyyy');
            $obj = $this->_entite->getEntite($id);
            $this->assertEqual($obj[Nom_Entite],'yyyy');
            $this->_entite->supprimerEntite($id);
            $nb3 = $this->_entite->fetchAll()->count();
            $this->assertEqual($nb1,$nb3);
        }
    }
}

<?php

class Model_DbTable_Entites extends Zend_Db_Table {
    
    protected $_name = 'entites';
        
    public function getEntite($id){
        $row = $this->fetchRow('Id_Entite = ' . (int)$id);
        if(!$row){
            throw new Exception("Ligne $id non trouvée");
        }
        return $row->toArray();
    }
    
    public function ajouterEntite($nom){
        $data = array('Nom_Entite' => $nom);
        $this->insert($data);
    }
    
    public function editerEntite($id, $nom){
        $data = array('Nom_Entite' => $nom);
        $this->update($data, 'Id_Entite = ' . (int)$id);
    }
    
    public function supprimerEntite($id){
        $this->delete('Id_Entite = ' . (int)$id);
    }    
    
}