public function testMap()
{
$resultSet = new ResultSet(array(1 => array('_id' => 1, 'field' => 'value1'), 2 => array('_id' => 2, 'field' => 'value2'), 3 => array('_id' => 3, 'field' => 'value3')));
$newSet = $resultSet->map(function ($item) {
$item['newField'] = 'newValue' . $item['_id'];
return $item;
});
$this->assertNotEmpty(count($newSet));
foreach ($newSet as $id => $item) {
$this->assertArrayHasKey('newField', $item);
$this->assertEquals('newValue' . $id, $item['newField']);
}
}