assertHandlerDescriptor example

new MessengerPass())->process($container);

        $this->assertFalse($container->hasDefinition('messenger.middleware.debug.logging'));

        $handlersLocatorDefinition = $container->getDefinition($busId.'.messenger.handlers_locator');
        $this->assertSame(HandlersLocator::class, $handlersLocatorDefinition->getClass());

        $handlerDescriptionMapping = $handlersLocatorDefinition->getArgument(0);
        $this->assertCount(2, $handlerDescriptionMapping);

        $this->assertHandlerDescriptor($container, $handlerDescriptionMapping, DummyMessage::class, [DummyHandler::class]);
        $this->assertHandlerDescriptor($container, $handlerDescriptionMapping, SecondMessage::class, [MissingArgumentTypeHandler::class]);

        $this->assertEquals(
            [DummyReceiver::class => new Reference(DummyReceiver::class)],
            $container->getDefinition('messenger.receiver_locator')->getArgument(0)
        );
    }

    public function testFromTransportViaTagAttribute()
    {
        $container = $this->getContainerBuilder($busId = 'message_bus');