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<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

$objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();

/** @var \Magento\Framework\Filesystem $filesystem */
$filesystem = $objectManager->create(\Magento\Framework\Filesystem::class);

/** @var $tmpDirectory \Magento\Framework\Filesystem\Directory\WriteInterface */
$tmpDirectory = $filesystem->getDirectoryWrite(\Magento\Framework\App\Filesystem\DirectoryList::SYS_TMP);
$tmpDirectory->create($tmpDirectory->getAbsolutePath());

$targetTmpFilePath = $tmpDirectory->getAbsolutePath('magento_small_image.jpg');
if (file_exists($targetTmpFilePath)) {
    unlink($targetTmpFilePath);
}