AssertExportNoDataErrorMessage.php

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

use Magento\ImportExport\Test\Page\Adminhtml\AdminExportIndex;
use Magento\Mtf\Constraint\AbstractConstraint;

class AssertExportNoDataErrorMessage extends AbstractConstraint
{
    const ERROR_MESSAGE = 'There is no data for the export.';

    public function processAssert(AdminExportIndex $adminExportIndex)
    {
        $actualMessage = $adminExportIndex->getMessagesBlock()->getErrorMessage();

        \PHPUnit\Framework\Assert::assertEquals(
            self::ERROR_MESSAGE,
            $actualMessage,
            'Wrong error message is displayed.'
            . "\nExpected: " . self::ERROR_MESSAGE
            . "\nActual: " . $actualMessage
        );
    }

    public function toString()
    {
        return 'Correct error message is displayed.';
    }
}