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

use Magento\TestFramework\Workaround\Override\Fixture\Resolver;

Resolver::getInstance()->requireDataFixture('Magento/Bundle/_files/product.php');

$objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
/** @var \Magento\Catalog\Api\ProductRepositoryInterface $productRepository */
$productRepository = $objectManager->create(\Magento\Catalog\Api\ProductRepositoryInterface::class);
/** @var $product \Magento\Catalog\Model\Product */
$product = $productRepository->get('bundle-product');

/** @var $typeInstance \Magento\Bundle\Model\Product\Type */
//Load options
$typeInstance = $product->getTypeInstance();
$typeInstance->setStoreFilter($product->getStoreId(), $product);
$optionCollection = $typeInstance->getOptionsCollection($product);
$selectionCollection = $typeInstance->getSelectionsCollection($typeInstance->getOptionsIds($product), $product);

$bundleOptions = [];
$bundleOptionsQty = [];
/** @var $option \Magento\Bundle\Model\Option */
foreach ($optionCollection as $option) {
    /** @var $selection \Magento\Bundle\Model\Selection */
    $selection = $selectionCollection->getFirstItem();
    $bundleOptions[$option->getId()] = $selection->getSelectionId();
    $bundleOptionsQty[$option->getId()] = 1;
}

$requestInfo = new \Magento\Framework\DataObject(
    ['qty' => 1, 'bundle_option' => $bundleOptions, 'bundle_option_qty' => $bundleOptionsQty]
);

/** @var $cart \Magento\Checkout\Model\Cart */
$cart = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(\Magento\Checkout\Model\Cart::class);
$cart->addProduct($product, $requestInfo);
$cart->getQuote()->setReservedOrderId('test_cart_with_bundle');
$cart->save();

/** @var $objectManager \Magento\TestFramework\ObjectManager */
$objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
$objectManager->removeSharedInstance(\Magento\Checkout\Model\Session::class);