@covers Symfony\Component\HttpFoundation\ParameterBag::getAlnum
public function testGetAlnum() {
$bag = new ParameterBag(array(
'word' => 'foo_BAR_012',
));
$this
->assertEquals('fooBAR012', $bag
->getAlnum('word'), '->getAlnum() gets only alphanumeric characters');
$this
->assertEquals('', $bag
->getAlnum('unknown'), '->getAlnum() returns empty string if a parameter is not defined');
}