no_robots_txt.php

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<?php
use Magento\Framework\App\Filesystem\DirectoryList;

$rootDirectory = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->get(
    \Magento\Framework\Filesystem::class
)->getDirectoryWrite(
    DirectoryList::ROOT
);
if ($rootDirectory->isExist('robots.txt')) {
    $rootDirectory->delete('robots.txt');
}