Magento2 Random Stock

random-stock.php

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();
$productCollection = $objectManager->create("\Magento\Catalog\Model\ResourceModel\Product\Collection");
foreach($productCollection as $product) {
  $productRepository = $objectManager->create("\Magento\Catalog\Api\ProductRepositoryInterface");
  $q = rand(0, 1000);
  $p = $productRepository->getById($product->getId());
  $p->setStatus(($q > 0 ? 1 : 0));
  $p->setStockData(array(
      'qty' => $q,
      'is_in_stock' => ($q > 0 ? 1 : 0)
  ));
  $productRepository->save($product);
}