AssertBackendPageIsAvailable.php

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

use Magento\Backend\Test\Page\Adminhtml\Dashboard;
use Magento\Mtf\Constraint\AbstractConstraint;

class AssertBackendPageIsAvailable extends AbstractConstraint
{
    const ERROR_TEXT = '404 Error';

    public function processAssert(Dashboard $dashboard, $pageTitle)
    {
        \PHPUnit\Framework\Assert::assertEquals(
            $pageTitle,
            $dashboard->getTitleBlock()->getTitle(),
            'Invalid page title is displayed.'
        );
        \PHPUnit\Framework\Assert::assertNotContains(
            self::ERROR_TEXT,
            $dashboard->getErrorBlock()->getContent(),
            "404 Error is displayed on '$pageTitle' page."
        );
    }

    public function toString()
    {
        return 'Backend has correct title and 404 page content is absent.';
    }
}