Fake a stripe payment process in a Mink test context

SubmitFakeStripeCreditCard.php

<?php

declare(strict_types = 1);

namespace MyApp\Web\Utility\Stripe;

use Behat\Mink\Session;
use MyApp\Domain\Payment\Stripe\PublishableKey;
use Zend\Escaper\Escaper;

final class SubmitFakeStripeCreditCard
{
    const JS_TEMPLATE = <<<'JS'
(function () {
    var stripeJs = document.createElement('script'),
        $payForReviewForm = document.querySelector('%s'),
        $fakeForm = document.createElement('form'),
        $stripeToken = document.createElement('input'),
        $stripeTokenType = document.createElement('input'),
        $stripeEmail = document.createElement('input'),
        $submitButton = document.createElement('input'),
        token;

    stripeJs.type = 'text/javascript';
    stripeJs.src  = 'https://js.stripe.com/v2/';
    
    stripeJs.onreadystatechange = stripeJs.onload = function() {
        if (! stripeJs.readyState || /loaded|complete/.test(stripeJs.readyState)) {
            Stripe.setPublishableKey('%s');
            Stripe.card.createToken(
                {
                    number: '4242424242424242',
                    cvc:    '123',
                    exp_month: '1',
                    exp_year: (new Date()).getFullYear() + 2
                },
                function (status, response) {
                    if (response.error) {
                        return;
                    }
                    
                    $fakeForm = document.createElement('form');
                    
                    $fakeForm.action = $payForReviewForm.action;
                    $fakeForm.method = $payForReviewForm.method;
                    
                    $stripeToken.type = 'hidden';
                    $stripeToken.name = 'stripeToken';
                    $stripeToken.value = response.id;
                    
                    $stripeTokenType.type = 'hidden';
                    $stripeTokenType.name = 'stripeTokenType';
                    $stripeTokenType.value = 'card';
                    
                    $stripeEmail.type = 'hidden';
                    $stripeEmail.name = 'stripeEmail';
                    $stripeEmail.value = 'test@code-reviews.io';
                    
                    $submitButton.type = 'hidden';
                    
                    $fakeForm.appendChild($stripeToken);
                    $fakeForm.appendChild($stripeTokenType);
                    $fakeForm.appendChild($stripeEmail);
                    $fakeForm.appendChild($submitButton);
                    
                    document.body.appendChild($fakeForm);
                    
                    $fakeForm.submit();
                }
            );
        }
    }

    document.getElementsByTagName('head')[0].appendChild(stripeJs);
}());
JS;

    public function __invoke(Session $session, PublishableKey $publishableKey, string $paymentFormToCopySelector)
    {
        $escaper = new Escaper();

        $session->executeScript(sprintf(self::JS_TEMPLATE, $escaper->escapeJs($paymentFormToCopySelector), (string) $publishableKey));
    }
}