ACP2E-3660: REST endpoint Product Import Json not validate the mandatory fields

Author: aplapana

app/code/Magento/CatalogImportExport/Test/Unit/Model/Import/ProductTest.php

@@ -1448,7 +1448,7 @@ public function testValidateValidateOptionEntity(): void
             ]
         ];
         $importProduct = $this->createModelMockWithErrorAggregator(
-            ['addRowError', 'getOptionEntity'],
+            ['addRowError', 'getOptionEntity', 'getNewSku'],
             ['isRowInvalid' => true]
         );