Alcaeus\MongoDbAdapter\Tests\Mongo\MongoGridFSTest::prepareFile PHP Method

    protected function prepareFile($data = 'abcd', $extra = [])
    {
        $collection = $this->getGridFS();
        // to make sure we have multiple chunks
        $extra += ['chunkSize' => 2];
        return $collection->storeBytes($data, $extra);
    }