AssertCheckoutErrorMessage.php

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

use Magento\Checkout\Test\Page\CheckoutOnepage;
use Magento\Mtf\Constraint\AbstractConstraint;

class AssertCheckoutErrorMessage extends AbstractConstraint
{
    public function processAssert(CheckoutOnepage $checkoutOnepage, $expectedErrorMessage)
    {
        \PHPUnit\Framework\Assert::assertEquals(
            $expectedErrorMessage,
            $checkoutOnepage->getMessagesBlock()->getErrorMessage(),
            'Wrong error message is displayed.'
        );
    }

    public function toString()
    {
        return 'Error message on Checkout onepage page is correct.';
    }
}