validate_image.php

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

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

$tmpDirectory = $filesystem->getDirectoryWrite(\Magento\Framework\App\Filesystem\DirectoryList::SYS_TMP);
$tmpDirectory->create($tmpDirectory->getAbsolutePath());

$targetTmpFilePath = $tmpDirectory->getAbsolutePath('magento_small_image.jpg');
copy(__DIR__ . '/magento_small_image.jpg', $targetTmpFilePath);
// Copying the image to target dir is not necessary because during product save, it will be moved there from tmp dir

$targetTmpFilePath = $tmpDirectory->getAbsolutePath('magento_empty.jpg');
copy(__DIR__ . '/magento_empty.jpg', $targetTmpFilePath);