public function testToVersion()
{
$o = new \VersionableBehaviorTest1();
$o->setBar(123);
// version 1
$o->save();
$o->setBar(456);
// version 2
$o->save();
$o->toVersion(1);
$this->assertEquals(123, $o->getBar());
$o->toVersion(2);
$this->assertEquals(456, $o->getBar());
}
