product_with_custom_option.php

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<?php
require __DIR__ . '/../../Checkout/_files/simple_product.php';
$product = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(\Magento\Catalog\Model\Product::class);
$product->load(1);

$product->setCanSaveCustomOptions(
    true
)->setHasOptions(
    true
);

$oldOptions = [
    [
        'id' => 1,
        'option_id' => 0,
        'previous_group' => 'text',
        'title' => 'Test Field',
        'type' => 'field',
        'is_require' => 1,
        'sort_order' => 0,
        'price' => 1,
        'price_type' => 'fixed',
        'sku' => '1-text',
        'max_characters' => 100,
    ],
];

$customOptions = [];

$customOptionFactory = $objectManager->create(\Magento\Catalog\Api\Data\ProductCustomOptionInterfaceFactory::class);

foreach ($oldOptions as $option) {
    $customOption = $customOptionFactory->create(['data' => $option]);
    $customOption->setProductSku($product->getSku());

    $customOptions[] = $customOption;
}

$product->setOptions($customOptions)->save();

$product = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(\Magento\Catalog\Model\Product::class);
$product->load(1);
$optionId = $product->getOptions()[0]->getOptionId();

$requestInfo = new \Magento\Framework\DataObject(['qty' => 1, 'options' => [$optionId => 'test']]);

require __DIR__ . '/../../Checkout/_files/cart.php';