MAGETWO-90144: [Forwardport] Fixed amount discount for whole cart applying an extra cent to the discount amount for

Author: OlgaVasyltsun

app/code/Magento/SalesRule/Model/Rule/Action/Discount/CartFixed.php

@@ -42,9 +42,9 @@ public function __construct(
         Validator $validator,
         DataFactory $discountDataFactory,
         PriceCurrencyInterface $priceCurrency,
-        DeltaPriceRound $deltaPriceRound = null
+        DeltaPriceRound $deltaPriceRound
     ) {
-        $this->deltaPriceRound = $deltaPriceRound ?: ObjectManager::getInstance()->get(DeltaPriceRound::class);
+        $this->deltaPriceRound = $deltaPriceRound;
 
         parent::__construct($validator, $discountDataFactory, $priceCurrency);
     }

dev/tests/integration/testsuite/Magento/SalesRule/Model/Rule/Action/Discount/CartFixedTest.php

@@ -105,7 +105,7 @@ private function createProduct(float $price): ProductInterface
         $productRepository = Bootstrap::getObjectManager()->get(ProductRepository::class);
         $product = Bootstrap::getObjectManager()->create(Product::class);
         $product->setTypeId('simple')
-            ->setAttributeSetId(4)
+            ->setAttributeSetId($product->getDefaultAttributeSetId())
             ->setWebsiteIds([1])
             ->setName($name)
             ->setSku(uniqid($name))