public function testSetMaxDepth()
 {
     $this->_helper->setMaxDepth(1);
     $this->_helper->findOneByLabel('Page 2.3.3')->setActive();
     // level 2
     $flag = Zend_View_Helper_Navigation_Links::RENDER_NEXT;
     $expected = '<link rel="next" href="page2/page2_3/page2_3_1" title="Page 2.3.1">';
     $actual = $this->_helper->setRenderFlag($flag)->render();
     $this->assertEquals($expected, $actual);
 }