MAGETWO-91725: Reward Points Balance Update Emails are not being sent when balance change initiated by store front

- Bug fix
- Integration test fix

Author: Yauhen_Lyskavets

app/code/Magento/Customer/Model/Metadata/CustomerMetadata.php

@@ -33,16 +33,26 @@ class CustomerMetadata implements CustomerMetadataInterface
      */
     private $attributeMetadataDataProvider;
 
+    /**
+     * List of system attributes which should be available to the clients.
+     *
+     * @var string[]
+     */
+    private $systemAttributes;
+
     /**
      * @param AttributeMetadataConverter $attributeMetadataConverter
      * @param AttributeMetadataDataProvider $attributeMetadataDataProvider
+     * @param string[] $systemAttributes
      */
     public function __construct(
         AttributeMetadataConverter $attributeMetadataConverter,
-        AttributeMetadataDataProvider $attributeMetadataDataProvider
+        AttributeMetadataDataProvider $attributeMetadataDataProvider,
+        array $systemAttributes = []
     ) {
         $this->attributeMetadataConverter = $attributeMetadataConverter;
         $this->attributeMetadataDataProvider = $attributeMetadataDataProvider;
+        $this->systemAttributes = $systemAttributes;
     }
 
     /**
@@ -136,25 +146,12 @@ public function getCustomAttributesMetadata($dataObjectClassName = self::DATA_IN
 
             if (!$isDataObjectMethod
                 && (!$attributeMetadata->isSystem()
-                    || in_array($attributeCode, $this->getAllowedSystemAttributesList())
+                    || in_array($attributeCode, $this->systemAttributes)
                 )
             ) {
                 $customAttributes[] = $attributeMetadata;
             }
         }
         return $customAttributes;
     }
-
-    /**
-     * Get list of system attributes which should be available to the clients
-     *
-     * @return array
-     */
-    private function getAllowedSystemAttributesList()
-    {
-        return [
-            'disable_auto_group_change',
-            'reward_update_notification'
-        ];
-    }
 }

app/code/Magento/Customer/etc/di.xml

@@ -127,6 +127,13 @@
             <argument name="groupManagement" xsi:type="object">Magento\Customer\Api\GroupManagementInterface\Proxy</argument>
         </arguments>
     </type>
+    <type name="Magento\Customer\Model\Metadata\CustomerMetadata">
+        <arguments>
+            <argument name="systemAttributes" xsi:type="array">
+                <item name="disable_auto_group_change" xsi:type="string">disable_auto_group_change</item>
+            </argument>
+        </arguments>
+    </type>
     <virtualType name="SectionInvalidationConfigReader" type="Magento\Framework\Config\Reader\Filesystem">
         <arguments>
             <argument name="idAttributes" xsi:type="array">

dev/tests/integration/testsuite/Magento/Customer/Model/CustomerMetadataTest.php

@@ -51,16 +51,23 @@ protected function setUp()
 
     public function testGetCustomAttributesMetadata()
     {
-        $customAttributesMetadata = $this->service->getCustomAttributesMetadata();
-        $this->assertCount(0, $customAttributesMetadata, "Invalid number of attributes returned.");
+        $customAttributesMetadataQty = count($this->service->getCustomAttributesMetadata()) ;
 
         // Verify the consistency of getCustomerAttributeMetadata() function from the 2nd call of the same service
-        $customAttributesMetadata1 = $this->service->getCustomAttributesMetadata();
-        $this->assertCount(0, $customAttributesMetadata1, "Invalid number of attributes returned.");
+        $customAttributesMetadata1Qty = count($this->service->getCustomAttributesMetadata());
+        $this->assertEquals(
+            $customAttributesMetadataQty,
+            $customAttributesMetadata1Qty,
+            "Invalid number of attributes returned."
+        );
 
         // Verify the consistency of getCustomAttributesMetadata() function from the 2nd service
-        $customAttributesMetadata2 = $this->serviceTwo->getCustomAttributesMetadata();
-        $this->assertCount(0, $customAttributesMetadata2, "Invalid number of attributes returned.");
+        $customAttributesMetadata2Qty = count($this->serviceTwo->getCustomAttributesMetadata());
+        $this->assertEquals(
+            $customAttributesMetadataQty,
+            $customAttributesMetadata2Qty,
+            "Invalid number of attributes returned."
+        );
     }
 
     public function testGetNestedOptionsCustomerAttributesMetadata()