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Upload File : current_dir [ Writeable ] document_root [ Writeable ]

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
use Magento\Framework\App\Filesystem\DirectoryList;

/** @var \Magento\Framework\Filesystem\Directory\Write $rootDirectory */
$rootDirectory = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->get(
    \Magento\Framework\Filesystem::class
)->getDirectoryWrite(
    DirectoryList::PUB
);
if ($rootDirectory->isExist('robots.txt')) {
    $rootDirectory->delete('robots.txt');
}