public function testUpdateArray()
{
$a = ['user' => [1 => ['name' => 'John', 'surname' => 'Smith'], 2 => ['name' => 'Sarah', 'surname' => 'Jones']]];
$p = new Persistence_Array($a);
$m = new Model($p, 'user');
$m->addField('name');
$m->addField('surname');
$m->load(1);
$m['name'] = 'Peter';
$m->save();
$m->load(2);
$m['surname'] = 'Smith';
$m->save();
$m['surname'] = 'QQ';
$m->save();
$this->assertEquals(['user' => [1 => ['name' => 'Peter', 'surname' => 'Smith'], 2 => ['name' => 'Sarah', 'surname' => 'QQ']]], $a);
$m->unload();
$m->set(['name' => 'Foo', 'surname' => 'Bar']);
$m->save();
$this->assertEquals(['user' => [1 => ['name' => 'Peter', 'surname' => 'Smith'], 2 => ['name' => 'Sarah', 'surname' => 'QQ'], 3 => ['name' => 'Foo', 'surname' => 'Bar', 'id' => 3]]], $a);
}