如何使用 Behat 测试在多总线场景中调度 Symfony Messenger 事件?

How to test that Symfony Messenger events are dispatched in a multi bus scenario using Behat?

似乎很难,并且没有太多关于此的文档(我使用的是 FirendsOfBehat Symfony 扩展)。我想使用 get() 方法测试 Transport 是否携带任何事件,但我没有得到任何结果。感觉它没有路由正确的总线。

declare(strict_types=1);

namespace App\Features\BehatContext;

class MessengerContext implements Context
{
    /**
     * @var TransportInterface
     */
    private $transport;

    /**
     * MessengerContext constructor.
     *
     * @param TransportInterface $transport ??? Is this ok
     */
    public function __construct(TransportInterface $transport)
    {
        // Symfony\Component\Messenger\Transport\InMemoryTransport
        $this->transport = $transport;
    }

    /**
     * THIS IS WHAT DOESN'T WORK
     * @Given /^(\d+) Events? "([^"]*)" is dispatched$/
     */
    public function eventAEventIsDispatched()
    {
        $eventsDispatched = $this->transport->get();
        Assert::assertTrue(count($eventsDispatched));
    }
}

我的packages/messenger.yaml配置:

framework:
    messenger:
        default_bus: event.bus
        buses:
            command.bus:
                middleware:
                    - validation
            event.bus:
                default_middleware: allow_no_handlers

        transports:
             sync: 'sync://'
             event: 'in-memory:///'

        routing:
             'App\AddMagazine': sync
             'App\MagazineAdded': event
             'App\EventAdapter': event

这是调度我的事件的class

declare(strict_types=1);

namespace App\Event\Dispatcher;


class SymfonyEventDispatcher implements ApplicationDomainDispatcherInterface
{
    private $messageBus;

    /**
     * SymfonyEventDispatcher constructor.
     *
     * @param MessageBusInterface $sfDispatcher
     */
    public function __construct(MessageBusInterface $eventBus)
    {
        // messageBus is Symfony\Component\Messenger\TraceableMessageBus
        $this->messageBus = $eventBus;
    }

    /**
     * @param EventInterface $event
     *
     * @return EventInterface
     */
    public function dispatch(EventInterface $event): EventInterface
    {
        $eventAdapter = new EventAdapter($event);
        $this->messageBus->dispatch(new Envelope($eventAdapter));

        return $eventAdapter;
    }
}

我的 service_test.yaml 文件在 运行 Behat 测试时被考虑在内:

services:

    _defaults:
        autowire: true
        autoconfigure: true

    App\Features\BehatContext\:
        resource: '../features/BehatContext/*'

    App\Features\BehatContext\MessengerContext:
        arguments:
            $transport: '@messenger.transport.event'

查看我的日志,我可以看到 Messenger 确实发送了事件:

[2019-08-30 14:14:50] messenger.INFO: Sending message App\EventAdapter with Symfony\Component\Messenger\Transport\InMemoryTransport {"message":"[object] (App\EventAdapter: {})","class":"App\EventAdapter","sender":"Symfony\Component\Messenger\Transport\InMemoryTransport"} []

我认为问题在于有两个不同的容器(一个用于应用程序,另一个用于 Mink 独立驱动程序),并且它们不共享它们的服务状态,因此无法获得 in-memory排队的消息。

我想到的第一个解决方案是放弃使用 Mink API 并开始使用 BrowserKit API (https://github.com/FriendsOfBehat/SymfonyExtension/pull/82)

第二种解决方案是使用最近引入的功能通过驱动程序的服务容器访问经过测试的应用程序服务:https://github.com/FriendsOfBehat/SymfonyExtension/pull/116

另一个常见的问题是在同一个场景中发出多个请求,那么存储在内存中的所有消息都会丢失。在那种情况下,我建议使用学说传输。

这是一个最新的例子,供任何在使用 MinkContext

时遇到此问题的人使用
<?php

declare(strict_types=1);

namespace App\Features\Bootstrap;

use Behat\Behat\Context\Context;
use Behat\Behat\Hook\Scope\BeforeScenarioScope;
use Behat\MinkExtension\Context\MinkContext;
use PHPUnit\Framework\Assert;
use Psr\Container\ContainerInterface;
use Symfony\Component\Messenger\Transport\InMemoryTransport;

/**
 * @author Daniel West <daniel@silverback.is>
 */
class MessengerContext implements Context
{
    private ContainerInterface $container;

    /**
     * @BeforeScenario
     */
    public function getContexts(BeforeScenarioScope $scope): void
    {
        /** @var MinkContext $mink */
        $mink = $scope->getEnvironment()->getContext(MinkContext::class);
        $client = $mink->getSession()->getDriver()->getClient();
        $container = $client->getContainer();
        $this->container = $container->has('test.service_container') ? $container->get('test.service_container') : $container;
    }

    /**
     * @Then /(\d+) message(?:s)? should have been sent to the transport named (.*)/
     */
    public function messaesHaveBeenSentToTheTransport(int $count, string $name): void
    {
        /** @var InMemoryTransport $transport */
        $transport = $this->container->get(sprintf('messenger.transport.%s', $name));
        Assert::assertCount($count, $transport->get());
    }
}