public function testButton()
 {
     $form = new HTML_QuickForm2('filters', 'post', null, false);
     $form->addDataSource(new HTML_QuickForm2_DataSource_Array(array('bar' => 'VALUE')));
     $button = $form->addButton('bar', array('type' => 'submit'));
     $button->addFilter('strtolower');
     $this->assertEquals('value', $button->getValue());
 }