AssertCustomVariableInPage.php

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<?php
namespace Magento\Variable\Test\Constraint;

use Magento\Cms\Test\Page\CmsIndex;
use Magento\Variable\Test\Fixture\SystemVariable;
use Magento\Store\Test\Fixture\Store;
use Magento\Mtf\Client\BrowserInterface;
use Magento\Mtf\Constraint\AbstractConstraint;
use Magento\Mtf\Fixture\FixtureFactory;

class AssertCustomVariableInPage extends AbstractConstraint
{
    public function processAssert(
        SystemVariable $customVariable,
        CmsIndex $cmsIndex,
        SystemVariable $variable,
        FixtureFactory $fixtureFactory,
        BrowserInterface $browser,
        Store $storeOrigin = null,
        SystemVariable $customVariableOrigin = null
    ) {
        $cmsPage = $fixtureFactory->createByCode(
            'cmsPage',
            [
                'dataset' => 'default',
                'data' => [
                    'content' => [
                        'content' => '{{customVar code=' . $customVariable->getCode() . '}}',
                    ],
                ],
            ]
        );
        $cmsPage->persist();
        $browser->open($_ENV['app_frontend_url'] . $cmsPage->getIdentifier());

        $cmsIndex->getStoreSwitcherBlock()->selectStoreView('Default Store View');

        $htmlValue = $customVariableOrigin
            ? $this->getHtmlValue($customVariable, $customVariableOrigin)
            : strip_tags($customVariable->getHtmlValue());
        $pageContent = $cmsIndex->getCmsPageBlock()->getPageContent();
        $this->checkVariable($htmlValue, $pageContent);

        if ($storeOrigin !== null) {
            $cmsIndex->getStoreSwitcherBlock()->selectStoreView($storeOrigin->getName());
            $htmlValue = strip_tags($customVariable->getHtmlValue());
            if ($htmlValue === '') {
                $htmlValue = strip_tags($variable->getHtmlValue());
            }
            $pageContent = $cmsIndex->getCmsPageBlock()->getPageContent();
            $this->checkVariable($htmlValue, $pageContent);
        }
    }

    protected function getHtmlValue(SystemVariable $customVariable, SystemVariable $customVariableOrigin)
    {
        $data = array_merge($customVariableOrigin->getData(), $customVariable->getData());
        if ($customVariable->getHtmlValue() == "" && $customVariableOrigin->getHtmlValue() == "") {
            $htmlValue = ($data['plain_value'] == "")
                ? $customVariableOrigin->getPlainValue()
                : $data['plain_value'];
        } else {
            $htmlValue = ($customVariableOrigin == null)
                ? $customVariable->getHtmlValue()
                : $customVariableOrigin->getHtmlValue();
            $htmlValue = strip_tags($htmlValue);
        }
        return $htmlValue;
    }

    protected function checkVariable($htmlValue, $pageContent)
    {
        \PHPUnit\Framework\Assert::assertEquals(
            $htmlValue,
            $pageContent,
            'Wrong content is displayed on frontend page'
            . "\nExpected: " . $htmlValue
            . "\nActual: " . $pageContent
        );
    }

    public function toString()
    {
        return 'Custom Variable is displayed on frontend page';
    }
}