AssertVisibleItemsQtyInCheckoutSummaryBlock.php

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

use Magento\Mtf\Constraint\AbstractConstraint;
use Magento\Checkout\Test\Fixture\Cart;
use Magento\Checkout\Test\Page\CheckoutOnepage;
use Magento\Catalog\Test\Fixture\CatalogProductSimple;

class AssertVisibleItemsQtyInCheckoutSummaryBlock extends AbstractConstraint
{
    public function processAssert(
        CheckoutOnepage $checkoutPage,
        Cart $cart,
        $checkoutSummaryMaxVisibleCartItemsCount
    ) {
        $reviewBlock = $checkoutPage->getReviewBlock();
        $reviewBlock->expandItemsBlock();

        $sourceProducts = $cart->getDataFieldConfig('items')['source'];
        $products = $sourceProducts->getProducts();

        $presentItems = 0;
        foreach (array_keys($cart->getItems()) as $key) {
            $product = $products[$key];
            if ($reviewBlock->getItemElement($product->getName())->isVisible()) {
                $presentItems++;
            }
        }

        \PHPUnit\Framework\Assert::assertEquals(
            $checkoutSummaryMaxVisibleCartItemsCount,
            $presentItems,
            'Wrong quantity of visible Cart items in checkout summary block.'
        );
    }

    public function toString()
    {
        return 'Quantity of visible Cart items the same as checkout configuration value.';
    }
}