Working with popup and Behat/Mink

Popup.php

<?php

use Behat\Behat\Context\BehatContext;

/**
 * Add Popup in Context
 */
class Popup extends BehatContext
{
    /**
     * @when /^(?:|I )confirm the popup$/
     */
    public function confirmPopup()
    {
        $this->getMainContext()->getSession()->getDriver()->getWebDriverSession()->accept_alert();
    }

    /**
     * @when /^(?:|I )cancel the popup$/
     */
    public function cancelPopup()
    {
        $this->getMainContext()->getSession()->getDriver()->getWebDriverSession()->dismiss_alert();
    }

    /**
     * @When /^(?:|I )should see "([^"]*)" in popup$/
     *
     * @param string $message The message.
     */
    public function assertPopupMessage($message)
    {
        $alertText = $this->getMainContext()->getSession()->getDriver()->getWebDriverSession()->getAlert_text();
        if ($alertText !== $message){
            throw new Exception("Modal dialog present: $alertText, when expected was $message");
        }   
    }

    /**
     * @When /^(?:|I )fill "([^"]*)" in popup$/
     *
     * @param string $message The message.
     */
    public function setPopupText($message)
    {
        $this->getMainContext()->getSession()->getDriver()->getWebDriverSession()->postAlert_text($message);
    }
}

I folk because not work in behat3
https://gist.github.com/b0n/e8ef5cd4e9803eec0d82e1e7a4422caa