gistfile1.php

<?php

/**
 * Changes the class metadata databases to the test database.
 *
 * @author Jordan Stout <jordan.stout@zeetogroup.com>
 */
final class ChangeDatabaseEventListener
{
    private $database;

    public function __construct($database)
    {
        $this->database = $database;
    }

    public function loadClassMetadata(LoadClassMetadataEventArgs $eventArgs)
    {
        $metadata = $eventArgs->getClassMetadata();
        if ($this->database === ($database = $metadata->getDatabase()) || null === $database) {
            return;
        }

        $metadata->setCollection($database.'.'.$metadata->getCollection());
        $metadata->setDatabase($this->database);
    }
}