silverstripe-framework/admin/tests/CampaignAdminTest/InvalidChangeSet.php

<?php

namespace SilverStripe\Admin\Tests\CampaignAdminTest;

use SilverStripe\ORM\UnexpectedDataException;
use SilverStripe\ORM\Versioning\ChangeSet;

class InvalidChangeSet extends ChangeSet
{
    public function sync()
    {
        throw new UnexpectedDataException("bad data");
    }
}