public function test_should_lock_optimistically()
{
$Account1 = new BankAccount(array('balance' => 2000));
$this->assertEqual($Account1->lock_version, 1, 'Version attribute initially starts at 1.');
$Account1->save();
$this->assertEqual($Account1->lock_version, 1, 'We are now on Version 1.');
$Account2 = new BankAccount($Account1->getId());
$this->assertEqual($Account2->lock_version, 1, 'We reloaded Version 1.');
$Account1->balance = 5;
$Account1->save();
$this->assertEqual($Account1->lock_version, 2, 'We are now on Version 2.');
$Account2->balance = 3000000;
$this->assertUpcomingError('Attempted to update a stale object');
$this->assertFalse($Account2->save(), 'We cant save because version number is wrong.');
$Account1->balance = 1000;
$this->assertTrue($Account1->save());
$Account3 = new BankAccount($Account1->getId());
$this->assertEqual($Account3->balance, 1000);
$this->assertEqual($Account3->lock_version, 3, 'We are now on Version 3.');
}
