Backward compatible: adding a constructor parameter

Author: coderimus

app/code/Magento/Sales/Block/Order/Recent.php

@@ -10,6 +10,7 @@
 use Magento\Customer\Model\Session;
 use Magento\Sales\Model\Order\Config;
 use Magento\Store\Model\StoreManagerInterface;
+use Magento\Framework\App\ObjectManager;
 
 /**
  * Sales order history block
@@ -57,15 +58,16 @@ public function __construct(
         CollectionFactory $orderCollectionFactory,
         Session $customerSession,
         Config $orderConfig,
-        StoreManagerInterface $storeManager,
-        array $data = []
+        array $data = [],
+        StoreManagerInterface $storeManager = null
     ) {
         $this->_orderCollectionFactory = $orderCollectionFactory;
         $this->_customerSession = $customerSession;
         $this->_orderConfig = $orderConfig;
-        $this->storeManager = $storeManager;
-        parent::__construct($context, $data);
         $this->_isScopePrivate = true;
+        $this->storeManager = $storeManager ?: ObjectManager::getInstance()
+            ->get(StoreManagerInterface::class);
+        parent::__construct($context, $data);
     }
 
     /**

app/code/Magento/Sales/Test/Unit/Block/Order/RecentTest.php

@@ -64,7 +64,6 @@ protected function setUp()
 
     public function testConstructMethod()
     {
-        $data = [];
         $attribute = ['customer_id', 'store_id', 'status'];
         $customerId = 25;
         $storeId = 4;
@@ -130,8 +129,8 @@ public function testConstructMethod()
             $this->orderCollectionFactory,
             $this->customerSession,
             $this->orderConfig,
-            $this->storeManagerMock,
-            $data
+            [],
+            $this->storeManagerMock
         );
         $this->assertEquals($orderCollection, $this->block->getOrders());
     }