Mockery로 모킹과 스터빙

전용 모의 객체 라이브러리가 필요한 이유

composer require --dev mockery/mockery

스텁, 모의 객체, 스파이 비교

allows()를 사용하는 스텁

<?php
use Mockery;
use PHPUnit\Framework\TestCase;

final class ConverterTest extends TestCase
{
    public function test_converts_using_rate(): void
    {
        $rates = Mockery::mock(RateGateway::class);
        $rates->allows()->rateFor('USD', 'EUR')->andReturn(0.9);

        $sut = new Converter($rates);
        self::assertSame(90.0, $sut->convert(100.0, 'USD', 'EUR'));

        Mockery::close();
    }
}

expects()를 사용하는 모의 객체

<?php
use Mockery;

$mailer = Mockery::mock(Mailer::class);
$mailer->expects()
       ->send(Mockery::type(Message::class))
       ->once();

$service = new SignupService($mailer);
$service->register('ada@example.com');

Mockery::close(); // fails here if send() was never called

인수 매처

<?php
use Mockery;

$repo = Mockery::mock(UserRepo::class);
$repo->expects()
     ->save(Mockery::on(fn(User $u) => $u->isActive()))
     ->once()
     ->andReturnTrue();

반환 순서와 동적 반환값

<?php
use Mockery;

$api = Mockery::mock(HttpClient::class);
// First call throws, second succeeds (retry test):
$api->shouldReceive('get')
    ->twice()
    ->andThrow(new \RuntimeException('timeout'))
    ->andReturn('{"ok":true}');

// Or derive the return from the input:
$api->shouldReceive('echo')
    ->andReturnUsing(fn(string $in) => strtoupper($in));

스파이: 사후에 단언하기

<?php
use Mockery;

$logger = Mockery::spy(Logger::class);

$service = new PaymentService($logger);
$service->charge(500);

// Assertions happen AFTER the action:
$logger->shouldHaveReceived('info')
       ->with(Mockery::pattern('/charged 500/'))
       ->once();

Mockery::close();

부분 모의 객체

<?php
use Mockery;

$report = Mockery::mock(Report::class)->makePartial();
// Only stub the slow/external method; the rest runs for real
$report->shouldReceive('fetchRawData')->andReturn(['a', 'b', 'c']);

// real summarize() runs, using the stubbed data
$summary = $report->summarize();

소유하지 않은 것은 모의 객체로 만들지 마십시오

<?php
interface PaymentGateway {            // you own this
    public function charge(int $cents, string $token): string;
}

final class StripeGateway implements PaymentGateway {
    public function __construct(private \Stripe\StripeClient $client) {}
    public function charge(int $cents, string $token): string {
        return $this->client->paymentIntents->create([/* ... */])->id;
    }
}
// Tests mock PaymentGateway, never \Stripe\StripeClient directly.

항상 종료하고 호출 횟수를 검증하기

<?php
use PHPUnit\Framework\TestCase;
use Mockery\Adapter\Phpunit\MockeryPHPUnitIntegration;

final class OrderServiceTest extends TestCase
{
    use MockeryPHPUnitIntegration; // auto-calls Mockery::close()

    public function test_does_not_refund_paid_orders(): void
    {
        $gw = \Mockery::mock(PaymentGateway::class);
        $gw->shouldReceive('refund')->never();
        // ... exercise SUT ...
    }
}

순서가 있는 예상

<?php
use Mockery;

$tx = Mockery::mock(Transaction::class);
$tx->shouldReceive('begin')->once()->ordered();
$tx->shouldReceive('commit')->once()->ordered();

$service = new TransferService($tx);
$service->run();

Mockery::close(); // fails if commit() happened before begin()

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