AssertSalesPrintOrderGrandTotal.php

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

use Magento\Sales\Test\Page\SalesGuestPrint;
use Magento\Mtf\Constraint\AbstractConstraint;

class AssertSalesPrintOrderGrandTotal extends AbstractConstraint
{
    public function processAssert(SalesGuestPrint $salesGuestPrint, array $prices)
    {
        \PHPUnit\Framework\Assert::assertEquals(
            number_format(array_sum($prices), 2),
            $salesGuestPrint->getViewBlock()->getItemBlock()->getGrandTotal(),
            "Grand total was printed incorrectly."
        );
    }

    public function toString()
    {
        return "Grand total was printed correctly.";
    }
}