Using 'attribs' for the form blows the action key. To get the form to generate properly, you have to move the action into the attribs array.

$form = new Zend_Form(array(
    'action' => '/user/test',
    'method' => 'post',
    'elements' => array(
        'username' => 'text'
    )
));

Works. Form action is set in HTML.

$form = new Zend_Form(array(
    'action' => '/user/test',
    'method' => 'post',
    'attribs' => array('id'=>'testid', 'class'=>'testclass'),
    'elements' => array(
        'username' => 'text'
    )
));

{color:red}Doesn't Work. Form action is not set in HTML.{color}

$form = new Zend_Form(array(
    'method' => 'post',
    'attribs' => array('action'=>'/user/test', 'id'=>'testid', 'class'=>
    'testclass'),
    'elements' => array(
        'username' => 'text'
    )
));

Works. Form action is set in HTML.