在 phpunit 测试中设置/使用会话

Question

我有一个简单的类，它包含序列化/反序列化对象数组并将它们添加到会话中，我想测试它。

我遇到的错误是

1. 没有可用的会话。
2. 当尝试构建会话时，该会话已经启动。

我在运行测试时转储了环境，它说它正在运行

test

我可以确认这里接受的答案已经在我的framework.yaml中（Symfony PHPUnit：无法启动会话，因为标头已被发送）

我是否遗漏了一些概念？我怎样才能创建会话？或者我应该使用其他方法来进行此测试？

下面的一些代码片段：

class SessionManager
{
    public function __construct(private RequestStack $requestStack, private SerializerInterface $serializer)
    {
    }

    public function addAttendee(Attendee $attendee): void
    {
        $session = $this->requestStack->getSession();
        $attendees = $this->getAttendees();
        $session->set('attendees', $this->serializer->serialize([...$attendees, $attendee], 'json'));
    }

    /**
     * @return Attendee[]
     */
    public function getAttendees(): array
    {
        $attendees = $this->requestStack->getSession()->get('attendees');
        return $this->serializer->deserialize($attendees, Attendee::class . '[]', 'json');
    }
}

第一个测试方法（和错误）

    /** @test */
    public function it_can_set_an_array_of_attendees_into_the_session()
    {
        $sessionManager = static::getContainer()->get(SessionManager::class);
        $attendee = new Attendee('firstname', 'lastname', 'female');
        $sessionManager->addAttendee($attendee);

        $attendees = $sessionManager->getAttendees();
        $this->assertEquals('firstname', $attendees[0]->firstname);
    }

1) App\Tests\Controller\SessionManagerTest::it_can_set_an_array_of_attendees_into_the_session
Symfony\Component\HttpFoundation\Exception\SessionNotFoundException: There is currently no session available.

.../vendor/symfony/http-foundation/RequestStack.php:105
.../src/Controller/SessionManager.php:17
.../tests/Controller/SessionManagerTest.php:48
.../vendor/phpunit/phpunit/phpunit:107

尝试创建并注入会话（和错误）

    /** @test */
    public function it_can_set_an_array_of_attendees_into_the_session()
    {
        // Create and start session, add to a Request, add Request to RequestStack, set RequestStack into container
        $session = new Session();
        $session->start();
        $request = new Request();
        $request->setSession($session);
        $requestStack = new RequestStack();
        $requestStack->push($request);
        static::getContainer()->set(RequestStack::class, $requestStack);

        $sessionManager = static::getContainer()->get(SessionManager::class);
        $attendee = new Attendee('firstname', 'lastname', 'female');
        $sessionManager->addAttendee($attendee);

        $attendees = $sessionManager->getAttendees();
        $this->assertEquals('firstname', $attendees[0]->firstname);
    }

1) App\Tests\Controller\SessionManagerTest::it_can_set_an_array_of_attendees_into_the_session
RuntimeException: Failed to start the session because headers have already been sent by ".../vendor/phpunit/phpunit/src/Util/Printer.php" at line 104.

.../vendor/symfony/http-foundation/Session/Storage/NativeSessionStorage.php:116
.../vendor/symfony/http-foundation/Session/Session.php:59
.../tests/Controller/SessionManagerTest.php:46
.../vendor/phpunit/phpunit/phpunit:107

Answer 1

我不确定为什么流会输出在 Printer.php 的第 104 行。

尝试使用 Symfony 的 MockFileSessionStorage 进行单元测试。

use Symfony\Component\HttpFoundation\Session\Storage\MockFileSessionStorage;

class UnitTest extends KernelTestCase
{
    public function it_can_set_an_array_of_attendees_into_the_session()
    {
        $session = new Session(new MockFileSessionStorage());
        // ...  
    }
}