Imagine that you have interfaces which describe the data access layer of your application. You haven't decided yet what kind of storing mechanism you want to use, you just want to make sure, that whatever you choose, it will handle concurrent requests well. For that you have to write concurrency tests against those interfaces.
I think a schematic concurrency test should be something like this:
public function testMoneyIsNotLostByConcurrentTransfers(){
$accountRepository = DataAccessLayer::getBankAccountRepository();
$accountOfTom = $accountRepository->create(array(
'owner' => 'Tom',
'balance' => new Money(10000)
));
$accountOfBob = $accountRepository->create(array(
'owner' => 'Bob',
'balance' => new Money(10000)
));
$accountOfSusanne = $accountRepository->create(array(
'owner' => 'Susanne',
'balance' => new Money(10000)
));
$this->concurrentExecution(
function () use ($accountOfTom, $accountOfBob){
$accountOfTom->transfer($accountOfBob, new Money(5000));
},
function() use ($accountOfTom, $accountOfSusanne){
$accountOfSusanne->transfer($accountOfTom, new Money(5000));
}
);
$this->assertEquals($accountOfTom->getBalanceAmount(), 10000);
$this->assertEquals($accountOfBob->getBalanceAmount(), 15000);
$this->assertEquals($accountOfSusanne->getBalanceAmount(), 5000);
}
Is it possible to write such tests, test runner in PHP? Or is there any existing tool which can help by concurrency testing in PHP?
