[GraphQl] Adding Wishlist GraphQl coverage

app/code/Magento/Wishlist/Model/Wishlist/AddProductsToWishlist.php

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+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Wishlist\Model\Wishlist;
+
+use Magento\Catalog\Api\ProductRepositoryInterface;
+use Magento\Framework\Exception\AlreadyExistsException;
+use Magento\Framework\Exception\LocalizedException;
+use Magento\Framework\Exception\NoSuchEntityException;
+use Magento\Wishlist\Model\ResourceModel\Wishlist as WishlistResourceModel;
+use Magento\Wishlist\Model\Wishlist;
+use Magento\Wishlist\Model\Wishlist\BuyRequest\BuyRequestBuilder;
+use Magento\Wishlist\Model\Wishlist\Data\WishlistItem;
+use Magento\Wishlist\Model\Wishlist\Data\WishlistOutput;
+
+/**
+ * Adding products to wishlist
+ */
+class AddProductsToWishlist
+{
+    /**#@+
+     * Error message codes
+     */
+    private const ERROR_PRODUCT_NOT_FOUND = 'PRODUCT_NOT_FOUND';
+    private const ERROR_UNDEFINED = 'UNDEFINED';
+    /**#@-*/
+
+    /**
+     * @var array
+     */
+    private $errors = [];
+
+    /**
+     * @var BuyRequestBuilder
+     */
+    private $buyRequestBuilder;
+
+    /**
+     * @var ProductRepositoryInterface
+     */
+    private $productRepository;
+
+    /**
+     * @var WishlistResourceModel
+     */
+    private $wishlistResource;
+
+    /**
+     * @param ProductRepositoryInterface $productRepository
+     * @param BuyRequestBuilder $buyRequestBuilder
+     * @param WishlistResourceModel $wishlistResource
+     */
+    public function __construct(
+        ProductRepositoryInterface $productRepository,
+        BuyRequestBuilder $buyRequestBuilder,
+        WishlistResourceModel $wishlistResource
+    ) {
+        $this->productRepository = $productRepository;
+        $this->buyRequestBuilder = $buyRequestBuilder;
+        $this->wishlistResource = $wishlistResource;
+    }
+
+    /**
+     * Adding products to wishlist
+     *
+     * @param Wishlist $wishlist
+     * @param array $wishlistItems
+     *
+     * @return WishlistOutput
+     *
+     * @throws AlreadyExistsException
+     */
+    public function execute(Wishlist $wishlist, array $wishlistItems): WishlistOutput
+    {
+        foreach ($wishlistItems as $wishlistItem) {
+            $this->addItemToWishlist($wishlist, $wishlistItem);
+        }
+
+        $wishlistOutput = $this->prepareOutput($wishlist);
+
+        if ($wishlist->isObjectNew() || count($wishlistOutput->getErrors()) !== count($wishlistItems)) {
+            $this->wishlistResource->save($wishlist);
+        }
+
+        return $wishlistOutput;
+    }
+
+    /**
+     * Add product item to wishlist
+     *
+     * @param Wishlist $wishlist
+     * @param WishlistItem $wishlistItem
+     *
+     * @return void
+     */
+    private function addItemToWishlist(Wishlist $wishlist, WishlistItem $wishlistItem): void
+    {
+        $sku = $wishlistItem->getParentSku() ?? $wishlistItem->getSku();
+
+        try {
+            $product = $this->productRepository->get($sku, false, null, true);
+        } catch (NoSuchEntityException $e) {
+            $this->addError(
+                __('Could not find a product with SKU "%sku"', ['sku' => $sku])->render(),
+                self::ERROR_PRODUCT_NOT_FOUND
+            );
+
+            return;
+        }
+
+        try {
+            $options = $this->buyRequestBuilder->build($wishlistItem, (int) $product->getId());
+            $result = $wishlist->addNewItem($product, $options);
+
+            if (is_string($result)) {
+                $this->addError($result);
+            }
+        } catch (LocalizedException $exception) {
+            $this->addError($exception->getMessage());
+        } catch (\Throwable $e) {
+            $this->addError(
+                __(
+                    'Could not add the product with SKU "%sku" to the wishlist:: %message',
+                    ['sku' => $sku, 'message' => $e->getMessage()]
+                )->render()
+            );
+        }
+    }
+
+    /**
+     * Add wishlist line item error
+     *
+     * @param string $message
+     * @param string|null $code
+     *
+     * @return void
+     */
+    private function addError(string $message, string $code = null): void
+    {
+        $this->errors[] = new Data\Error(
+            $message,
+            $code ?? self::ERROR_UNDEFINED
+        );
+    }
+
+    /**
+     * Prepare output
+     *
+     * @param Wishlist $wishlist
+     *
+     * @return WishlistOutput
+     */
+    private function prepareOutput(Wishlist $wishlist): WishlistOutput
+    {
+        $output = new WishlistOutput($wishlist, $this->errors);
+        $this->errors = [];
+
+        return $output;
+    }
+}

app/code/Magento/Wishlist/Model/Wishlist/BuyRequest/BundleDataProvider.php

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+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Wishlist\Model\Wishlist\BuyRequest;
+
+use Magento\Wishlist\Model\Wishlist\Data\WishlistItem;
+
+/**
+ * Data provider for bundle product buy requests
+ */
+class BundleDataProvider implements BuyRequestDataProviderInterface
+{
+    private const PROVIDER_OPTION_TYPE = 'bundle';
+
+    /**
+     * @inheritdoc
+     *
+     * @phpcs:disable Magento2.Functions.DiscouragedFunction
+     */
+    public function execute(WishlistItem $wishlistItem, ?int $productId): array
+    {
+        $bundleOptionsData = [];
+
+        foreach ($wishlistItem->getSelectedOptions() as $optionData) {
+            $optionData = \explode('/', base64_decode($optionData->getId()));
+
+            if ($this->isProviderApplicable($optionData) === false) {
+                continue;
+            }
+
+            [, $optionId, $optionValueId, $optionQuantity] = $optionData;
+
+            $bundleOptionsData['bundle_option'][$optionId] = $optionValueId;
+            $bundleOptionsData['bundle_option_qty'][$optionId] = $optionQuantity;
+        }
+
+        return $bundleOptionsData;
+    }
+
+    /**
+     * Checks whether this provider is applicable for the current option
+     *
+     * @param array $optionData
+     *
+     * @return bool
+     */
+    private function isProviderApplicable(array $optionData): bool
+    {
+        return $optionData[0] === self::PROVIDER_OPTION_TYPE;
+    }
+}

app/code/Magento/Wishlist/Model/Wishlist/BuyRequest/BuyRequestBuilder.php

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+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Wishlist\Model\Wishlist\BuyRequest;
+
+use Magento\Framework\DataObject;
+use Magento\Framework\DataObjectFactory;
+use Magento\Wishlist\Model\Wishlist\Data\WishlistItem;
+
+/**
+ * Building buy request for all product types
+ */
+class BuyRequestBuilder
+{
+    /**
+     * @var BuyRequestDataProviderInterface[]
+     */
+    private $providers;
+
+    /**
+     * @var DataObjectFactory
+     */
+    private $dataObjectFactory;
+
+    /**
+     * @param DataObjectFactory $dataObjectFactory
+     * @param array $providers
+     */
+    public function __construct(
+        DataObjectFactory $dataObjectFactory,
+        array $providers = []
+    ) {
+        $this->dataObjectFactory = $dataObjectFactory;
+        $this->providers = $providers;
+    }
+
+    /**
+     * Build product buy request for adding to wishlist
+     *
+     * @param WishlistItem $wishlistItemData
+     * @param int|null $productId
+     *
+     * @return DataObject
+     */
+    public function build(WishlistItem $wishlistItemData, ?int $productId = null): DataObject
+    {
+        $requestData = [
+            [
+                'qty' => $wishlistItemData->getQuantity(),
+            ]
+        ];
+
+        foreach ($this->providers as $provider) {
+            $requestData[] = $provider->execute($wishlistItemData, $productId);
+        }
+
+        return $this->dataObjectFactory->create(['data' => array_merge(...$requestData)]);
+    }
+}

app/code/Magento/Wishlist/Model/Wishlist/BuyRequest/BuyRequestDataProviderInterface.php

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+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Wishlist\Model\Wishlist\BuyRequest;
+
+use Magento\Wishlist\Model\Wishlist\Data\WishlistItem;
+
+/**
+ * Build buy request for adding products to wishlist
+ */
+interface BuyRequestDataProviderInterface
+{
+    /**
+     * Provide buy request data from add to wishlist item request
+     *
+     * @param WishlistItem $wishlistItemData
+     * @param int|null $productId
+     *
+     * @return array
+     */
+    public function execute(WishlistItem $wishlistItemData, ?int $productId): array;
+}