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Functional testing

In this chapter we give some advices on how to test message queue related logic.

NULL transport
Traceable message producer

NULL transport

While testing the application you don’t usually need to send real message to real broker. Or even have a dependency on a MQ broker. Here’s the purpose of the NULL transport. It simple do nothing when you ask it to send a message. Pretty useful in tests. Here’s how you can configure it.

# app/config/config_test.yml

enqueue:
    default:
        transport: 'null:'
        client: ~

Traceable message producer

Imagine you have a service my_service with a method someMethod() that internally sends a message and you have to find out was the message sent or not. There is a solution for that. You have to enable traceable message producer in test environment.

# app/config/config_test.yml

enqueue:
    default:
        client:
            traceable_producer: true

If you did so, you can use its methods getTraces, getTopicTraces or clearTraces. Here’s an example:

<?php
use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
use Enqueue\Client\TraceableProducer;

class FooTest extends WebTestCase
{
    /** @var  \Symfony\Bundle\FrameworkBundle\Client */
    private $client;

    public function setUp(): void
    {
        $this->client = static::createClient();
    }

    public function testMessageSentToFooTopic()
    {
        // Use your own business logic here:
        $service = $this->client->getContainer()->get('my_service');

        // someMethod() is part of your business logic and is calling somewhere $producer->send('fooTopic', 'messageBody');
        $service->someMethod();

        $traces = $this->getProducer()->getTopicTraces('fooTopic');

        $this->assertCount(1, $traces);
        $this->assertEquals('messageBody', $traces[0]['message']);
    }

    /**
     * @return TraceableProducer
     */
    private function getProducer()
    {
        return $this->client->getContainer()->get(TraceableProducer::class);
    }
}

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