public function test_index()
{
$collection = Jam::all('test_city')->load_fields(array('id' => 1, 'name' => 'London'));
$items = array('name' => Tart::column());
$index = Tart::index($collection, 0, $items);
$this->assertInstanceOf('Tart_Index', $index);
$this->assertSame($collection, $index->collection());
$this->assertSame($items, $index->content()->items());
}
