AssertSuccessfulReadinessCheck.php

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

use Magento\Install\Test\Page\Install;
use Magento\Mtf\Constraint\AbstractConstraint;

class AssertSuccessfulReadinessCheck extends AbstractConstraint
{
    const PHP_VERSION_MESSAGE = 'Your PHP version is correct';

    const PHP_EXTENSIONS_REGEXP = '/You meet (\d+) out of \1 PHP extensions requirements\./';

    const FILE_PERMISSION_REGEXP = '/You meet (\d+) out of \1 writable file permission requirements\./';

    public function processAssert(Install $installPage)
    {
        \PHPUnit\Framework\Assert::assertContains(
            self::PHP_VERSION_MESSAGE,
            $installPage->getReadinessBlock()->getPhpVersionCheck(),
            'PHP version is incorrect.'
        );
        \PHPUnit\Framework\Assert::assertRegExp(
            self::PHP_EXTENSIONS_REGEXP,
            $installPage->getReadinessBlock()->getPhpExtensionsCheck(),
            'PHP extensions missed.'
        );
        \PHPUnit\Framework\Assert::assertRegExp(
            self::FILE_PERMISSION_REGEXP,
            $installPage->getReadinessBlock()->getFilePermissionCheck(),
            'File permissions does not meet requirements.'
        );
    }

    public function toString()
    {
        return "PHP Version, PHP Extensions and File Permission are ok.";
    }
}