public function testReduce()
{
$resultSet = new ResultSet(array(1 => array('_id' => 1, 'field' => '10'), 2 => array('_id' => 2, 'field' => '20'), 3 => array('_id' => 3, 'field' => '30')));
$value = $resultSet->reduce(function ($accumulator, $item) {
$accumulator += $item['field'];
return $accumulator;
}, 0);
$this->assertEquals(60, $value);
}
