Sample of using new Mink getWindowName() functions

<?php
/**
 * Reference GitHub project at: https://github.com/Behat/Mink/pull/341
 *
 * Sample steps:
 *      Then I switch to popup
 *      Then I do stuff  #Whatever actions to take in the popup window
 *      Then I switch back to original window
 */

use Behat\Behat\Context\ClosuredContextInterface,
    Behat\Behat\Context\TranslatedContextInterface,
    Behat\Behat\Context\BehatContext,
    Behat\Behat\Exception\PendingException;
use Behat\Gherkin\Node\PyStringNode,
    Behat\Gherkin\Node\TableNode;
use Behat\Mink\Exception\ResponseTextException;
use Behat\MinkExtension\Context\MinkContext;

//
// Require 3rd-party libraries here:
//
//   require_once 'PHPUnit/Autoload.php';
//   require_once 'PHPUnit/Framework/Assert/Functions.php';
//

/**
 * Features context.
 */
class FeatureContext extends MinkContext {
    var $originalWindowName = '';

    /**
     * Initializes context.
     * Every scenario gets it's own context object.
     *
     * @param array $parameters context parameters (set them up through behat.yml)
     */
    public function __construct(array $parameters) {
        if (!isset($parameters['base_url'])) {
            $parameters['base_url'] = 'http://api.google.com';
        }
    }

    /**
     * Finds the system name for the current window.
     *
     * @Then /^I find this windows name$/
     */
    public function iFindThisWindowsName() {
        $name = $this->getSession()->getWindowName();
        echo "Window name is: '$name'\n\n";
        echo "Original window name is: '{$this->originalWindowName}'\n\n";

        $names = $this->getSession()->getWindowNames();
        echo "Window names are: '" . print_r($names, true) . "'\n\n";

        #die();
    }

    /**
     * Sets the current window as the original window.
     *
     * @return string The original window name
     */
    private function saveOriginalWindow() {
        $originalWindowName = $this->getSession()->getWindowName(); //Get the original name

        if (empty($this->originalWindowName)) {
            $this->originalWindowName = $originalWindowName;
        }

        return $originalWindowName;
    }

    /**
     * Saves the current window as the original window.
     *
     * @Then /^I save my current window$/
     */
    public function iSaveMyCurrentWindow() {
        $originalWindowName = $this->saveOriginalWindow();
    }

    /**
     * Switches over to the most recent popup window.
     *
     * @Then /^I switch to popup$/
     */
    public function iSwitchToPopup() {
        $originalWindowName = $this->saveOriginalWindow();
        $this->getSession()->getPage()->pressButton("Withdraw"); //Pressing the withdraw button (do I need this?)
        $popupName = $this->getNewPopup($originalWindowName);

        //Switch to the popup Window
        $this->getSession()->switchToWindow($popupName);
    }

    /**
     * Switches back to the original window.
     *
     * @Then /^I switch back to original window$/
     */
    public function iSwitchBackToOriginalWindow() {
        //Switch to the original window
        $this->getSession()->switchToWindow($this->originalWindowName);
    }

    /**
     * This gets the window name of the new popup.
     */
    private function getNewPopup($originalWindowName = NULL) {
        //Get all of the window names first
        $names = $this->getSession()->getWindowNames();

        //Now it should be the last window name
        $last = array_pop($names);

        if (!empty($originalWindowName)) {
            while ($last == $originalWindowName && !empty($names)) {
                $last = array_pop($names);
            }
        }

        return $last;
    }
}