BaseExtension.php

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<?php
namespace Magento\FunctionalTestingFramework\Extension;

use Codeception\Events;
use Codeception\Exception\ModuleRequireException;
use Codeception\Extension;
use Codeception\Module\WebDriver;

class BaseExtension extends Extension
{
    public static $events = [
        Events::TEST_BEFORE => 'beforeTest',
        Events::STEP_BEFORE => 'beforeStep'
    ];

    private $uri;

    public function beforeTest(\Codeception\Event\TestEvent $e)
    {
        $this->uri = null;
    }

    public function beforeStep(\Codeception\Event\StepEvent $e)
    {
        $this->pageChanged();
    }

    public function getDriver()
    {
        return $this->getModule($this->config['driver']);
    }

    public function getUri()
    {
        return $this->uri;
    }

    protected function pageChanged()
    {
        try {
            if ($this->getDriver() === null) {
                return false;
            }
            $currentUri = $this->getDriver()->_getCurrentUri();

            if ($this->uri !== $currentUri) {
                $this->uri = $currentUri;
                return true;
            }
        } catch (\Exception $e) {
            // just fall through and return false
        }
        return false;
    }
}