public function testSelectOptionGroups()
{
$form = new Form();
$country = $form->addSingleSelect('country');
$country->addOptionGroup('Europe')->addOptions(['GB' => 'United Kingdom', 'IE' => 'Ireland', 'FR' => 'France']);
$country->addOptionGroup('America')->addOptions(['US' => 'United States', 'CA' => 'Canada']);
$country->addOption('Antarctica', 'AQ');
$country->setValue('US');
$this->assertEquals('US', $country->getValue());
$id = $country->getId();
$html = '<select name="country" id="' . $id . '">' . '<optgroup label="Europe">' . '<option value="GB">United Kingdom</option>' . '<option value="IE">Ireland</option>' . '<option value="FR">France</option>' . '</optgroup>' . '<optgroup label="America">' . '<option value="US" selected="selected">United States</option>' . '<option value="CA">Canada</option>' . '</optgroup>' . '<option value="AQ">Antarctica</option>' . '</select>';
$this->assertEquals($html, $country->render());
}
