Added the ability to use entity properties in metadata

Author: Cristian101

src/Magento/FunctionalTestingFramework/DataGenerator/Persist/OperationDataArrayResolver.php

@@ -134,6 +134,14 @@ public function resolveOperationDataArray($entityObject, $operationMetadata, $op
                     ));
                 }
             } else {
+
+                $operationElementProperty = null;
+                if(strpos($operationElementType, '.') !== false){
+                    $operationElementComponents = explode('.',$operationElementType);
+                    $operationElementType = $operationElementComponents[0];
+                    $operationElementProperty = $operationElementComponents[1];
+                }
+
                 $entityNamesOfType = $entityObject->getLinkedEntitiesOfType($operationElementType);
 
                 // If an element is required by metadata, but was not provided in the entity, throw an exception
@@ -146,12 +154,23 @@ public function resolveOperationDataArray($entityObject, $operationMetadata, $op
                     ));
                 }
                 foreach ($entityNamesOfType as $entityName) {
-                    $operationDataSubArray = $this->resolveNonPrimitiveElement(
-                        $entityName,
-                        $operationElement,
-                        $operation,
-                        $fromArray
-                    );
+
+                    if($operationElementProperty === null) {
+                        $operationDataSubArray = $this->resolveNonPrimitiveElement(
+                            $entityName,
+                            $operationElement,
+                            $operation,
+                            $fromArray
+                        );
+                    }else {
+                        $linkedEntityObj = $this->resolveLinkedEntityObject($entityName);
+                        $operationDataSubArray = $linkedEntityObj->getDataByName($operationElementProperty,0);
+
+                        if($operationDataSubArray === null)
+                            throw new \Exception(
+                                sprintf('Property %s not found in entity %s \n', $operationElementProperty, $entityName)
+                            );
+                    }
 
                     if ($operationElement->getType() == OperationDefinitionObjectHandler::ENTITY_OPERATION_ARRAY) {
                         $operationDataArray[$operationElement->getKey()][] = $operationDataSubArray;