PaypalIframe.php

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<?php
namespace Magento\Paypal\Test\Block\Onepage\Payment;

use Magento\Checkout\Test\Block\Onepage\Payment\Method;
use Magento\Mtf\Client\ElementInterface;
use Magento\Mtf\Fixture\FixtureInterface;

class PaypalIframe extends Method
{
    private $payNowButton = '#btn_pay_cc';

    private $paypalIframe = '.paypal.iframe';

    private $creditCardForm = '#formCreditCard';

    private $errorMessage = '#messageBox';

    protected $formBlockCc;

    protected $loader = '#lightBoxDiv';

    public function fillPaymentData(FixtureInterface $creditCard)
    {
        $iframeRootElement = $this->switchToPaypalFrame();
        $formBlock = $this->blockFactory->create(
            $this->formBlockCc,
            ['element' => $this->_rootElement->find($this->creditCardForm)]
        );
        $formBlock->fill($creditCard, $iframeRootElement);
        $iframeRootElement->find($this->payNowButton)->click();

        $this->waitSubmitForm($iframeRootElement);

        $this->browser->switchToFrame();
    }

    protected function waitSubmitForm(ElementInterface $iframeRootElement)
    {
        $loaderElement = $iframeRootElement->find($this->loader);

        $loaderElement->waitUntil(function () use ($loaderElement) {
            return $loaderElement->isVisible() ? true : null;
        });

        $loaderElement->waitUntil(function () use ($loaderElement) {
            return !$loaderElement->isVisible() ? true : null;
        });
    }

    public function isErrorMessageVisible()
    {
        $isErrorMessageVisible = false;
        if ($this->_rootElement->find($this->paypalIframe)->isPresent()) {
            $iframeRootElement = $this->switchToPaypalFrame();
            $isErrorMessageVisible = $iframeRootElement->find($this->errorMessage)->isVisible();
            $this->browser->switchToFrame();
        }
        return $isErrorMessageVisible;
    }

    private function switchToPaypalFrame()
    {
        $iframeLocator = $this->browser->find($this->paypalIframe)->getLocator();
        $this->browser->switchToFrame($iframeLocator);
        return $this->browser->find('body');
    }
}