LYNX-402: Internal server error when trying to get priceDetails for Bundle products with dynamic price

* LYNX-402: Fix DivisionByZeroError at Magento/BundleGraphQl/Model/Resolver/BundlePriceDetails.php:31

* LYNX-402: Test coverage for division by zero error

* LYNX-402: Internal server error when trying to get priceDetails for Bundle products with dynamic price

Moved the test coverage to dev/tests/api-functional/testsuite/Magento/GraphQl/Bundle/BundleProductMainPriceTest.php from dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetCartTest.php

---------

Co-authored-by: Sergio Vera <svera@adobe.com>

Author: sumesh-GL

app/code/Magento/BundleGraphQl/Model/Resolver/BundlePriceDetails.php

@@ -28,7 +28,7 @@ public function resolve(Field $field, $context, ResolveInfo $info, array $value
 
         $price = $product->getPrice();
         $finalPrice = $product->getFinalPrice();
-        $discountPercentage = 100 - (($finalPrice * 100) / $price);
+        $discountPercentage = ($price) ? (100 - (($finalPrice * 100) / $price)) : 0;
         return [
             'main_price' =>  $price,
             'main_final_price' => $finalPrice,

dev/tests/api-functional/testsuite/Magento/GraphQl/Bundle/BundleProductMainPriceTest.php

@@ -7,10 +7,38 @@
 
 namespace Magento\GraphQl\Bundle;
 
+use Magento\Bundle\Test\Fixture\AddProductToCart as AddBundleProductToCart;
+use Magento\Bundle\Test\Fixture\Link as BundleSelectionFixture;
+use Magento\Bundle\Test\Fixture\Option as BundleOptionFixture;
+use Magento\Bundle\Test\Fixture\Product as BundleProductFixture;
+use Magento\Catalog\Test\Fixture\Product as ProductFixture;
+use Magento\Quote\Model\QuoteIdToMaskedQuoteIdInterface;
+use Magento\Quote\Test\Fixture\GuestCart as GuestCartFixture;
+use Magento\TestFramework\Fixture\DataFixture;
+use Magento\TestFramework\Fixture\DataFixtureStorage;
+use Magento\TestFramework\Fixture\DataFixtureStorageManager;
+use Magento\TestFramework\Helper\Bootstrap;
 use Magento\TestFramework\TestCase\GraphQlAbstract;
 
 class BundleProductMainPriceTest extends GraphQlAbstract
 {
+    /**
+     * @var QuoteIdToMaskedQuoteIdInterface
+     */
+    private $quoteIdToMaskedId;
+
+    /**
+     * @var DataFixtureStorage
+     */
+    private $fixtures;
+
+    protected function setUp(): void
+    {
+        $objectManager = Bootstrap::getObjectManager();
+        $this->quoteIdToMaskedId = $objectManager->get(QuoteIdToMaskedQuoteIdInterface::class);
+        $this->fixtures = DataFixtureStorageManager::getStorage();
+    }
+
     public function getQuery()
     {
         $productSku = 'fixed_bundle_product_with_special_price';
@@ -129,4 +157,71 @@ public function testBundleProductPriceDetails(): void
         $this->assertEquals(40.0, $priceDetails['main_final_price']);
         $this->assertEquals(20, $priceDetails['discount_percentage']);
     }
+
+    #[
+        DataFixture(ProductFixture::class, ['sku' => 'simple1', 'price' => 10], as:'p1'),
+        DataFixture(ProductFixture::class, ['sku' => 'simple2', 'price' => 20], as:'p2'),
+        DataFixture(BundleSelectionFixture::class, ['sku' => '$p1.sku$'], as:'link1'),
+        DataFixture(BundleSelectionFixture::class, ['sku' => '$p2.sku$'], as:'link2'),
+        DataFixture(BundleOptionFixture::class, ['title' => 'Checkbox Options', 'type' => 'checkbox',
+            'required' => 1,'product_links' => ['$link1$', '$link2$']], 'opt1'),
+        DataFixture(BundleOptionFixture::class, ['title' => 'Checkbox Options', 'type' => 'checkbox',
+            'required' => 1,'product_links' => ['$link1$', '$link2$']], 'opt2'),
+        DataFixture(
+            BundleProductFixture::class,
+            ['sku' => 'bundle-product-multiselect-checkbox-options', '_options' => ['$opt1$', '$opt2$']],
+            as:'bp1'
+        ),
+        DataFixture(GuestCartFixture::class, as: 'guestCart'),
+        DataFixture(
+            AddBundleProductToCart::class,
+            [
+                'cart_id' => '$guestCart.id$',
+                'product_id' => '$bp1.id$',
+                'selections' => [['$p1.id$'], ['$p2.id$']],
+                'qty' => 2
+            ]
+        )
+    ]
+    public function testCartBundleProductPriceDetails()
+    {
+        $guestCart = $this->fixtures->get('guestCart');
+        $guestQuoteMaskedId = $this->quoteIdToMaskedId->execute((int)$guestCart->getId());
+
+        $cartQuery = $this->getGuestCartQuery($guestQuoteMaskedId);
+        $cartResponse = $this->graphQlMutation($cartQuery);
+        $productPriceDetails = $cartResponse['cart']['itemsV2']['items'][0]['product']['price_details'];
+        self::assertArrayHasKey('main_price', $productPriceDetails);
+        self::assertArrayHasKey('main_final_price', $productPriceDetails);
+        self::assertArrayHasKey('discount_percentage', $productPriceDetails);
+        self::assertEquals(0, $productPriceDetails['main_price']);
+        self::assertEquals(30, $productPriceDetails['main_final_price']);
+        self::assertEquals(0, $productPriceDetails['discount_percentage']);
+    }
+
+    private function getGuestCartQuery(string $maskedId): string
+    {
+        return <<<QUERY
+{
+  cart(cart_id: "{$maskedId}") {
+    itemsV2 {
+      items {
+        product {
+          sku
+          ... on BundleProduct {
+            dynamic_price
+            price_view
+            price_details {
+              main_price
+              main_final_price
+              discount_percentage
+            }
+          }
+        }
+      }
+    }
+  }
+}
+QUERY;
+    }
 }