#33334:Inheriting from a class that doesn't exist

- Made changes backwards compatible.

Author: monteshot

app/code/Magento/Bundle/Pricing/Price/ConfiguredPrice.php

@@ -67,18 +67,19 @@ public function __construct(
         $quantity,
         BundleCalculatorInterface $calculator,
         PriceCurrencyInterface $priceCurrency,
-        DiscountCalculator $discountCalculator,
         ItemInterface $item = null,
         JsonSerializer $serializer = null,
-        ConfiguredPriceSelection $configuredPriceSelection = null
+        ConfiguredPriceSelection $configuredPriceSelection = null,
+        DiscountCalculator $discountCalculator = null
     ) {
         $this->item = $item;
         $this->serializer = $serializer ?: \Magento\Framework\App\ObjectManager::getInstance()
             ->get(JsonSerializer::class);
         $this->configuredPriceSelection = $configuredPriceSelection
             ?: \Magento\Framework\App\ObjectManager::getInstance()
                 ->get(ConfiguredPriceSelection::class);
-        $this->discountCalculator = $discountCalculator;
+        $this->discountCalculator = $discountCalculator
+            ?: \Magento\Framework\App\ObjectManager::getInstance()->get(DiscountCalculator::class);
         parent::__construct($saleableItem, $quantity, $calculator, $priceCurrency);
     }
 

app/code/Magento/Bundle/Test/Unit/Pricing/Price/BundlePriceTest.php

@@ -130,10 +130,10 @@ protected function setUp(): void
             1,
             $this->calculator,
             $this->priceCurrencyMock,
-            $this->discountCalculator,
             null,
             $this->jsonSerializerMock,
-            $this->configuredPriceSelectionMock
+            $this->configuredPriceSelectionMock,
+            $this->discountCalculator,
         );
         $this->model->setItem($this->item);
     }