public function testFilter()
{
$resultSet = new ResultSet(array(1 => array('_id' => 1, 'field' => 'value1'), 2 => array('_id' => 2, 'field' => 'value2'), 3 => array('_id' => 3, 'field' => 'value3')));
// skip even ids
$newSet = $resultSet->filter(function ($item) {
return $item['_id'] % 2 !== 0;
});
$this->assertEquals(array(1 => array('_id' => 1, 'field' => 'value1'), 3 => array('_id' => 3, 'field' => 'value3')), iterator_to_array($newSet));
}