TranslateCachingTest.php

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<?php
namespace Magento\Framework;

use Magento\TestFramework\Helper\Bootstrap;

class TranslateCachingTest extends \PHPUnit\Framework\TestCase
{
    protected $renderer;

    protected $objectManager;

    protected function setUp()
    {
        $this->objectManager = Bootstrap::getObjectManager();
        $this->renderer = Phrase::getRenderer();
        Phrase::setRenderer($this->objectManager->get(\Magento\Framework\Phrase\RendererInterface::class));
    }

    protected function tearDown()
    {
        Phrase::setRenderer($this->renderer);

        $cache = $this->objectManager->get(\Magento\Framework\App\Cache\Type\Translate::class);
        $cache->clean();
    }

    public function testLoadDataCaching()
    {
        $model = $this->objectManager->get(\Magento\Framework\Translate::class);

        $model->loadData(\Magento\Framework\App\Area::AREA_FRONTEND, true); // this is supposed to cache the fixture
        $this->assertEquals('Fixture Db Translation', new Phrase('Fixture String'));

        $translateString = $this->objectManager->create(\Magento\Translation\Model\ResourceModel\StringUtils::class);
        $translateString->saveTranslate('Fixture String', 'New Db Translation');

        $this->assertEquals(
            'Fixture Db Translation',
            new Phrase('Fixture String'),
            'Translation is expected to be cached'
        );

        $model->loadData(\Magento\Framework\App\Area::AREA_FRONTEND, true);
        $this->assertEquals(
            'New Db Translation',
            new Phrase('Fixture String'),
            'Forced load should not use cache'
        );
    }
}