Can not use fixture in test case.

[bitshine]

Everything is ok in using YiiMongoDbSuite, but when use fixture in the test, it show an error:

CDbConnection.connectionString cannot be empty.

[bitshine]

I build a class MongoDbFixtureManager extends CDbFixtureManager.

require_once('d:/www/yii-1.1.5.r2654/framework/test/CDbFixtureManager.php');
    class MongoDbFixtureManager extends CDbFixtureManager
    {
    private $_db;

    public $connectionID='mongodb';

    public function getDbConnection()
    {
        if($this->_db===null)
        {           
            $this->_db=Yii::app()->getComponent($this->connectionID);           
            if(!$this->_db instanceof EMongoDB)
                throw new CException(Yii::t('yii','CDbTestFixture.connectionID "{id}" is invalid. Please make sure it refers to the ID of a CDbConnection application component.',
                    array('{id}'=>$this->connectionID)));
        }       
        return $this->_db;
    }
}

because mongodb has no schema, this can not work.