MAGETWO-67871: Requesting autogenerated classes that are not in constructor cause fatal errors in production mode

- fix test

Author: Igor Melnikov

app/code/Magento/Multishipping/Test/Unit/Model/Checkout/Type/MultishippingTest.php

@@ -149,6 +149,10 @@ protected function setUp()
         $this->customerSessionMock->expects($this->atLeastOnce())->method('getCustomerDataObject')
             ->willReturn($this->customerMock);
         $this->totalsCollectorMock = $this->createSimpleMock(TotalsCollector::class);
+        $this->cartExtensionFactoryMock = $this->getMockBuilder(CartExtensionFactory::class)
+            ->setMethods(['create'])
+            ->disableOriginalConstructor()
+            ->getMock();
         $allowedCountryReaderMock = $this->getMockBuilder(AllowedCountries::class)
             ->disableOriginalConstructor()
             ->setMethods(['getAllowedCountries'])
@@ -179,21 +183,13 @@ protected function setUp()
             $this->filterBuilderMock,
             $this->totalsCollectorMock,
             $data,
+            $this->cartExtensionFactoryMock,
             $allowedCountryReaderMock
         );
 
-        $this->cartExtensionFactoryMock = $this->getMockBuilder(CartExtensionFactory::class)
-            ->setMethods(['create'])
-            ->disableOriginalConstructor()
-            ->getMock();
         $this->shippingAssignmentProcessorMock = $this->createSimpleMock(ShippingAssignmentProcessor::class);
 
         $objectManager = new ObjectManager($this);
-        $objectManager->setBackwardCompatibleProperty(
-            $this->model,
-            'cartExtensionFactory',
-            $this->cartExtensionFactoryMock
-        );
         $objectManager->setBackwardCompatibleProperty(
             $this->model,
             'shippingAssignmentProcessor',