AC-15104::[CE] PHPUnit 12: Upgrade Checkout & Cart Management related test cases

Author: del72683

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

@@ -24,8 +24,6 @@
 use Magento\Quote\Api\GuestPaymentMethodManagementInterface;
 use Magento\Quote\Model\Quote;
 use Magento\Quote\Model\Quote\Address;
-use Magento\Quote\Model\Quote\Address\Rate;
-use Magento\Quote\Model\QuoteIdMask;
 use Magento\Quote\Model\QuoteIdMaskFactory;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;

app/code/Magento/Quote/Test/Unit/Model/ShippingAddressAssignmentTest.php

@@ -8,15 +8,14 @@
 namespace Magento\Quote\Test\Unit\Model;
 
 use Magento\Quote\Api\Data\AddressInterface;
-use Magento\Quote\Api\Data\CartExtension;
 use Magento\Quote\Api\Data\CartExtensionFactory;
+use Magento\Quote\Test\Unit\Helper\CartExtensionTestHelper;
 use Magento\Quote\Api\Data\ShippingAssignmentInterface;
 use Magento\Quote\Model\Quote;
 use Magento\Quote\Model\Quote\Address;
 use Magento\Quote\Model\Quote\ShippingAssignment\ShippingAssignmentProcessor;
 use Magento\Quote\Model\ShippingAddressAssignment;
 use PHPUnit\Framework\MockObject\MockObject;
-use PHPUnit\Framework\MockObject\RuntimeException;
 use PHPUnit\Framework\TestCase;
 
 class ShippingAddressAssignmentTest extends TestCase