FingerprintTest.php

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<?php
namespace Magento\Signifyd\Block;

use Magento\Framework\App\Area;
use Magento\Framework\App\ObjectManager;
use Magento\Framework\View\LayoutInterface;
use Magento\TestFramework\Helper\Bootstrap;

class FingerprintTest extends \PHPUnit\Framework\TestCase
{
    private $objectManager;

    protected function setUp()
    {
        $bootstrap = Bootstrap::getInstance();
        $bootstrap->loadArea(Area::AREA_FRONTEND);

        $this->objectManager = Bootstrap::getObjectManager();
    }

    public function testSessionIdPresent()
    {
        self::assertContains('data-order-session-id', $this->getBlockContents());
    }

    public function testBlockEmpty()
    {
        self::assertEmpty($this->getBlockContents());
    }

    private function getBlockContents()
    {
        $block = $this->objectManager->get(LayoutInterface::class)
            ->createBlock(Fingerprint::class);

        return $block->fetchView($block->getTemplateFile());
    }
}