MC-19706: URL rewrite not created upon creating the product

Author: Roman Lytvynenko

app/code/Magento/Catalog/Model/Product.php

@@ -837,7 +837,9 @@ public function getStoreIds()
                 }
                 foreach ($websiteIds as $websiteId) {
                     $websiteStores = $this->_storeManager->getWebsite($websiteId)->getStoreIds();
-                    $storeIds = $storeIds + $websiteStores;
+                    foreach ($websiteStores as $websiteStore) {
+                        $storeIds []= $websiteStore;
+                    }
                 }
             }
             $this->setStoreIds($storeIds);

app/code/Magento/Catalog/Test/Unit/Model/ProductTest.php

@@ -470,9 +470,11 @@ public function testGetStoreSingleSiteModelIds(
 
         $this->model->isObjectNew($isObjectNew);
 
-        $this->storeManager->expects($this->exactly(
-            (int) !$isObjectNew
-        ))
+        $this->storeManager->expects(
+            $this->exactly(
+                (int) !$isObjectNew
+            )
+        )
             ->method('isSingleStoreMode')
             ->will($this->returnValue(true));