ReferentialTest.php

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<?php
namespace Magento\Test\Integrity\Magento\Payment\Config;

class ReferentialTest extends \PHPUnit\Framework\TestCase
{
    protected static $_usedGroups = [];

    protected static $_registeredGroups = [];

    public static function setUpBeforeClass()
    {
        self::_populateUsedGroups();
        self::_populateRegisteredGroups();
    }

    private static function _populateUsedGroups()
    {
        $configFiles = \Magento\Framework\App\Utility\Files::init()->getConfigFiles('config.xml', [], false);
        foreach ($configFiles as $file) {
            $dom = new \DOMDocument();
            $dom->loadXML(file_get_contents($file));

            $xpath = new \DOMXPath($dom);
            foreach ($xpath->query('/config/*/payment/*/group') as $group) {
                if (!in_array($group->nodeValue, self::$_usedGroups)) {
                    self::$_usedGroups[] = $group->nodeValue;
                }
            }
        }
    }

    private static function _populateRegisteredGroups()
    {
        $configFiles = \Magento\Framework\App\Utility\Files::init()->getConfigFiles('payment.xml', [], false);
        foreach ($configFiles as $file) {
            $dom = new \DOMDocument();
            $dom->loadXML(file_get_contents($file));

            $xpath = new \DOMXPath($dom);
            foreach ($xpath->query('/payment/groups/group') as $group) {
                $id = $group->attributes->getNamedItem('id')->nodeValue;
                if (!in_array($id, self::$_registeredGroups)) {
                    self::$_registeredGroups[] = $id;
                }
            }
        }
    }

    public function testGroupsExists()
    {
        $missing = array_diff(self::$_usedGroups, self::$_registeredGroups);

        if (!empty($missing)) {
            $message = sprintf(
                "The groups, referenced in store configuration for the payment, " .
                "don't correspond to any payment group declared in payment.xml: %s",
                implode(', ', $missing)
            );
            $this->fail($message);
        }
    }
}