Index.php

<?php
namespace Surething\Testimonials\Controller\Adminhtml\TestimonialsImport;

use Magento\Backend\App\Action;

class Index extends \Magento\Backend\App\Action {

    public function execute() {
        $this->_forward('edit');
    }
    /**
     * @var \Magento\Framework\View\Result\PageFactory
     */
    //protected $resultPageFactory;

    /**
     * Constructor
     *
     * @param \Magento\Backend\App\Action\Context $context
     * @param \Magento\Framework\View\Result\PageFactory $resultPageFactory
     */
    /*public function __construct( \Magento\Backend\App\Action\Context $context,
            \Magento\Framework\View\Result\PageFactory $resultPageFactory ) {

        parent::__construct( $context );
        $this->resultPageFactory = $resultPageFactory;

    }*/

    /**
     * Load the page defined in view/adminhtml/layout/exampleadminnewpage_helloworld_index.xml
     *
     * @return \Magento\Framework\View\Result\Page
     */
    /*public function execute() {
        //return $resultPage = $this->resultPageFactory->create();
        $this->_view->loadLayout();
        $this->_view->getLayout()->initMessages();
        $this->_view->renderLayout();
    }*/
}