GraphQL-388: updateCustomer mutation doesn't update undefined fields

Author: naydav

app/code/Magento/CustomerGraphQl/etc/schema.graphqls

@@ -92,6 +92,7 @@ type Customer @doc(description: "Customer defines the customer name and address
     id: Int @doc(description: "The ID assigned to the customer")
     is_subscribed: Boolean @doc(description: "Indicates whether the customer is subscribed to the company's newsletter") @resolver(class: "\\Magento\\CustomerGraphQl\\Model\\Resolver\\IsSubscribed")
     addresses: [CustomerAddress] @doc(description: "An array containing the customer's shipping and billing addresses")
+    gender: Int @doc(description: "The customer's gender(Male - 1, Female - 2)")
 }
 
 type CustomerAddress @doc(description: "CustomerAddress contains detailed information about a customer's billing and shipping addresses"){

dev/tests/api-functional/testsuite/Magento/GraphQl/Customer/ChangeCustomerPasswordTest.php

@@ -94,7 +94,7 @@ public function testChangeWeakPassword()
     /**
      * @magentoApiDataFixture Magento/Customer/_files/customer.php
      * @expectedException \Exception
-     * @expectedExceptionMessage The password doesn't match this account. Verify the password and try again.
+     * @expectedExceptionMessage Invalid login or password.
      */
     public function testChangePasswordIfPasswordIsInvalid()
     {

dev/tests/api-functional/testsuite/Magento/GraphQl/Customer/UpdateCustomerTest.php

@@ -70,7 +70,7 @@ public function testUpdateCustomer()
             taxvat: "{$newTaxVat}"
             email: "{$newEmail}"
             password: "{$currentPassword}"
-            gender: "{$newGender}"
+            gender: {$newGender}
         }
     ) {
         customer {
@@ -82,6 +82,7 @@ public function testUpdateCustomer()
             dob
             taxvat
             email
+            gender
         }
     }
 }
@@ -209,7 +210,7 @@ public function testUpdateEmailIfPasswordIsMissed()
     /**
      * @magentoApiDataFixture Magento/Customer/_files/customer.php
      * @expectedException \Exception
-     * @expectedExceptionMessage The password doesn't match this account. Verify the password and try again.
+     * @expectedExceptionMessage Invalid login or password.
      */
     public function testUpdateEmailIfPasswordIsInvalid()
     {