AssertCartIsEmpty.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\Client\BrowserInterface;
use Magento\Mtf\Constraint\AbstractConstraint;

class AssertCartIsEmpty extends AbstractConstraint
{
    const TEXT_EMPTY_CART = 'You have no items in your shopping cart. Click here to continue shopping.';

    public function processAssert(CheckoutCart $checkoutCart, BrowserInterface $browser)
    {
        $checkoutCart->open();
        $cartEmptyBlock = $checkoutCart->getCartEmptyBlock();

        \PHPUnit\Framework\Assert::assertEquals(
            self::TEXT_EMPTY_CART,
            $cartEmptyBlock->getText(),
            'Wrong text on empty cart page.'
        );

        $cartEmptyBlock->clickLinkToMainPage();
        \PHPUnit\Framework\Assert::assertEquals(
            $_ENV['app_frontend_url'],
            $browser->getUrl(),
            'Wrong link to main page on empty cart page.'
        );
    }

    public function toString()
    {
        return 'Shopping Cart is empty.';
    }
}