Extension of Codeception\Lib\Connector\Yii2, used by CodeceptionYii2Module gist, for Multiple DBs and Shared Transactions.

Extended Codeception Yii2 Client

<?php

namespace tests\codeception\common\Lib\Connector;

use Yii;

/**
 * Extended Codeception Yii2 Client:
 *
 * This custom class extends the original Codeception\Lib\Connector\Yii2 to
 * support Multiple DBs and Shared Transactions.
 * Used by tests\codeception\common\Module\Yii2.
 */
class Yii2 extends \Codeception\Lib\Connector\Yii2
{
    /**
     * Array of DB Connection objects indexed by App DB component id string.
     * Set by tests\codeception\common\Module\Yii2->_before($test) after creating DB Transactions.
     * 
     * @var Array[string => \yii\db\Connection]
     */
    public $dbs = array();
    
    /**
     * Create an Application object and set the DB Connection components to this->dbs objects.
     * 
     * @return \yii\web\Application $app
     */
    public function startApp()
    {
        $config = require($this->configFile);
        if (!isset($config['class'])) {
            $config['class'] = 'yii\web\Application';
        }
        /** @var \yii\web\Application $app */
        $app = Yii::createObject($config);
        if(sizeof($this->dbs) > 0) {
            foreach($this->dbs as $db_id => $db) {
                $app->set($db_id, $db);
            }
        }
        return $app;
    }
}

In yii2-advanced where i have to give the cleanup:false while accessing database