public function testEmptyFilterCollection()
{
$filters = new FilterCollection();
$this->assertFalse($filters->rewind());
$this->assertFalse($filters->end());
$this->assertFalse($filters->key());
$this->assertFalse($filters->current());
$this->assertFalse($filters->valid());
$this->assertSame(0, count($filters));
}