AssertGrandTotalInShoppingCart.php

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<?php
namespace Magento\Checkout\Test\Constraint;

use Magento\Checkout\Test\Fixture\Cart;
use Magento\Checkout\Test\Page\CheckoutCart;
use Magento\Mtf\Constraint\AbstractConstraint;

class AssertGrandTotalInShoppingCart extends AbstractConstraint
{
    public function processAssert(CheckoutCart $checkoutCart, Cart $cart, $requireReload = true)
    {
        if ($requireReload) {
            $checkoutCart->open();
            $checkoutCart->getTotalsBlock()->waitForUpdatedTotals();
        }

        $fixtureGrandTotal = number_format($cart->getGrandTotal(), 2);
        $pageGrandTotal = $checkoutCart->getTotalsBlock()->getGrandTotal();
        \PHPUnit\Framework\Assert::assertEquals(
            $fixtureGrandTotal,
            $pageGrandTotal,
            'Grand total price in the shopping cart not equals to grand total price from fixture.'
        );
    }

    public function toString()
    {
        return 'Grand total price in the shopping cart equals to expected grand total price from data set.';
    }
}