MessageProcessorLoaderTest.php

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<?php
namespace Magento\Framework\MessageQueue\Test\Unit;

use Magento\Framework\TestFramework\Unit\Helper\ObjectManager as ObjectManagerHelper;

class MessageProcessorLoaderTest extends \PHPUnit\Framework\TestCase
{
    private $mergedMessageProcessor;

    private $defaultMessageProcessor;

    private $messageProcessorLoader;

    protected function setUp()
    {
        $this->mergedMessageProcessor = $this
            ->getMockBuilder(\Magento\Framework\MessageQueue\MessageProcessorInterface::class)
            ->disableOriginalConstructor()
            ->getMockForAbstractClass();
        $this->defaultMessageProcessor = $this
            ->getMockBuilder(\Magento\Framework\MessageQueue\MessageProcessorInterface::class)
            ->disableOriginalConstructor()
            ->getMockForAbstractClass();

        $objectManagerHelper = new ObjectManagerHelper($this);
        $this->messageProcessorLoader = $objectManagerHelper->getObject(
            \Magento\Framework\MessageQueue\MessageProcessorLoader::class,
            [
                'mergedMessageProcessor' => $this->mergedMessageProcessor,
                'defaultMessageProcessor' => $this->defaultMessageProcessor
            ]
        );
    }

    public function testLoad($message)
    {
        $messageTopic = 'topic';
        $messages = [
            $messageTopic => [$message]
        ];

        $this->assertInstanceOf(
            \Magento\Framework\MessageQueue\MessageProcessorInterface::class,
            $this->messageProcessorLoader->load($messages)
        );
    }

    public function loadDataProvider()
    {
        $mergedMessage = $this->getMockBuilder(\Magento\Framework\MessageQueue\MergedMessageInterface::class)
            ->disableOriginalConstructor()
            ->getMockForAbstractClass();
        $message = $this->getMockBuilder(\Magento\Framework\MessageQueue\EnvelopeInterface::class)
            ->disableOriginalConstructor()
            ->getMockForAbstractClass();

        return [
            [$mergedMessage],
            [$message]
        ];
    }
}