ACP2E-4156: For Shipping Information Server Side Validation is not Working using REST API

Author: soklymeach

app/code/Magento/Checkout/Model/GuestShippingInformationManagement.php

@@ -63,18 +63,9 @@ public function saveAddressInformation(
         ShippingInformationInterface $addressInformation
     ) {
         $shippingAddress = $addressInformation->getShippingAddress();
-        $extensionAttributes = null;
         if ($shippingAddress) {
-            $extensionAttributes = $shippingAddress->getExtensionAttributes();
             $this->validateAddressAttributes($shippingAddress, 'shipping');
         }
-        $billingAddress = $addressInformation->getBillingAddress();
-        if ($billingAddress) {
-            if ($extensionAttributes && empty($billingAddress->getExtensionAttributes()->__toArray())) {
-                $billingAddress->setExtensionAttributes($extensionAttributes);
-            }
-            $this->validateAddressAttributes($billingAddress, 'billing');
-        }
 
         /** @var $quoteIdMask \Magento\Quote\Model\QuoteIdMask */
         $quoteIdMask = $this->quoteIdMaskFactory->create()->load($cartId, 'masked_id');

app/code/Magento/Checkout/Test/Unit/Model/GuestShippingInformationManagementTest.php

@@ -84,18 +84,18 @@ public function testSaveAddressInformation()
         $addressInformationMock->expects($this->once())
             ->method('getBillingAddress')
             ->willReturn($billingAddressMock);
-        $shippingAddressMock->expects($this->exactly(2))
+        $shippingAddressMock->expects($this->once())
             ->method('getExtensionAttributes')
             ->willReturn(null);
         $billingAddressMock->expects($this->once())
             ->method('getExtensionAttributes')
             ->willReturn(null);
         $customerAddressMock = $this->createMock(Address::class);
-        $this->addressFactoryMock->expects($this->exactly(2))
+        $this->addressFactoryMock->expects($this->once())
             ->method('create')
             ->willReturn($customerAddressMock);
         $validatorMock = $this->createMock(ValidatorInterface::class);
-        $this->validatorFactoryMock->expects($this->exactly(2))
+        $this->validatorFactoryMock->expects($this->once())
             ->method('createValidator')
             ->with('customer_address', 'save')
             ->willReturn($validatorMock);
@@ -136,8 +136,6 @@ public function testSaveAddressInformationWithInvalidAddress()
         $addressInformationMock->expects($this->once())
             ->method('getShippingAddress')
             ->willReturn($shippingAddressMock);
-        $addressInformationMock->expects($this->never())
-            ->method('getBillingAddress');
         $shippingAddressMock->method('getExtensionAttributes')->willReturn(null);
         $customerAddressMock = $this->createMock(Address::class);
         $this->addressFactoryMock->expects($this->once())->method('create')->willReturn($customerAddressMock);