Fix backordering from Adminhtml.

Initialize 'backorder' value for quote items even if Quote has Super Mode enabled.

Author: swnsma

app/code/Magento/CatalogInventory/Model/Quote/Item/QuantityValidator.php

@@ -104,8 +104,7 @@ public function validate(Observer $observer)
         $quoteItem = $observer->getEvent()->getItem();
         if (!$quoteItem ||
             !$quoteItem->getProductId() ||
-            !$quoteItem->getQuote() ||
-            $quoteItem->getQuote()->getIsSuperMode()
+            !$quoteItem->getQuote()
         ) {
             return;
         }
@@ -118,6 +117,18 @@ public function validate(Observer $observer)
             throw new LocalizedException(__('The Product stock item is invalid. Verify the stock item and try again.'));
         }
 
+        if (($options = $quoteItem->getQtyOptions()) && $qty > 0) {
+            foreach ($options as $option) {
+                $this->optionInitializer->initialize($option, $quoteItem, $qty);
+            }
+        } else {
+            $this->stockItemInitializer->initialize($stockItem, $quoteItem, $qty);
+        }
+
+        if ($quoteItem->getQuote()->getIsSuperMode()) {
+            return;
+        }
+
         /* @var \Magento\CatalogInventory\Api\Data\StockStatusInterface $stockStatus */
         $stockStatus = $this->stockRegistry->getStockStatus($product->getId(), $product->getStore()->getWebsiteId());
 
@@ -160,7 +171,7 @@ public function validate(Observer $observer)
         /**
          * Check item for options
          */
-        if (($options = $quoteItem->getQtyOptions()) && $qty > 0) {
+        if ($options) {
             $qty = $product->getTypeInstance()->prepareQuoteItemQty($qty, $product);
             $quoteItem->setData('qty', $qty);
             if ($stockStatus) {
@@ -194,7 +205,7 @@ public function validate(Observer $observer)
             $removeError = true;
 
             foreach ($options as $option) {
-                $result = $this->optionInitializer->initialize($option, $quoteItem, $qty);
+                $result = $option->getStockStateResult();
                 if ($result->getHasError()) {
                     $option->setHasError(true);
                     //Setting this to false, so no error statuses are cleared
@@ -207,7 +218,7 @@ public function validate(Observer $observer)
             }
         } else {
             if ($quoteItem->getParentItem() === null) {
-                $result = $this->stockItemInitializer->initialize($stockItem, $quoteItem, $qty);
+                $result = $quoteItem->getStockStateResult();
                 if ($result->getHasError()) {
                     $this->addErrorInfoToQuote($result, $quoteItem);
                 } else {

app/code/Magento/CatalogInventory/Model/Quote/Item/QuantityValidator/Initializer/Option.php

@@ -133,6 +133,8 @@ public function initialize(
 
         $stockItem->unsIsChildItem();
 
+        $option->setStockStateResult($result);
+
         return $result;
     }
 }

app/code/Magento/CatalogInventory/Model/Quote/Item/QuantityValidator/Initializer/StockItem.php

@@ -135,6 +135,8 @@ public function initialize(
             $quoteItem->setBackorders($result->getItemBackorders());
         }
 
+        $quoteItem->setStockStateResult($result);
+
         return $result;
     }
 }

app/code/Magento/CatalogInventory/Test/Unit/Model/Quote/Item/QuantityValidator/Initializer/QuantityValidatorTest.php

@@ -278,8 +278,11 @@ public function testValidateWithOptions()
     {
         $optionMock = $this->getMockBuilder(OptionItem::class)
             ->disableOriginalConstructor()
-            ->setMethods(['setHasError'])
+            ->setMethods(['setHasError', 'getStockStateResult'])
             ->getMock();
+        $optionMock->expects($this->once())
+            ->method('getStockStateResult')
+            ->willReturn($this->resultMock);
         $this->stockRegistryMock->expects($this->at(0))
             ->method('getStockItem')
             ->willReturn($this->stockItemMock);
@@ -316,14 +319,17 @@ public function testValidateWithOptionsAndError()
     {
         $optionMock = $this->getMockBuilder(OptionItem::class)
             ->disableOriginalConstructor()
-            ->setMethods(['setHasError'])
+            ->setMethods(['setHasError', 'getStockStateResult'])
             ->getMock();
         $this->stockRegistryMock->expects($this->at(0))
             ->method('getStockItem')
             ->willReturn($this->stockItemMock);
         $this->stockRegistryMock->expects($this->at(1))
             ->method('getStockStatus')
             ->willReturn($this->stockStatusMock);
+        $optionMock->expects($this->once())
+            ->method('getStockStateResult')
+            ->willReturn($this->resultMock);
         $options = [$optionMock];
         $this->createInitialStub(1);
         $this->setUpStubForQuantity(1, true);
@@ -354,12 +360,15 @@ public function testValidateAndRemoveErrorsFromQuote()
     {
         $optionMock = $this->getMockBuilder(OptionItem::class)
             ->disableOriginalConstructor()
-            ->setMethods(['setHasError'])
+            ->setMethods(['setHasError', 'getStockStateResult'])
             ->getMock();
         $quoteItem = $this->getMockBuilder(Item::class)
             ->disableOriginalConstructor()
             ->setMethods(['getItemId', 'getErrorInfos'])
             ->getMock();
+        $optionMock->expects($this->once())
+            ->method('getStockStateResult')
+            ->willReturn($this->resultMock);
         $this->stockRegistryMock->expects($this->at(0))
             ->method('getStockItem')
             ->willReturn($this->stockItemMock);

app/code/Magento/CatalogInventory/Test/Unit/Model/Quote/Item/QuantityValidator/Initializer/StockItemTest.php

@@ -84,6 +84,7 @@ public function testInitializeWithSubitem()
                     'setMessage',
                     'setBackorders',
                     '__wakeup',
+                    'setStockStateResult'
                 ]
             )
             ->disableOriginalConstructor()
@@ -178,6 +179,7 @@ public function testInitializeWithSubitem()
         $quoteItem->expects($this->once())->method('setMessage')->with('message')->will($this->returnSelf());
         $result->expects($this->exactly(2))->method('getItemBackorders')->will($this->returnValue('backorders'));
         $quoteItem->expects($this->once())->method('setBackorders')->with('backorders')->will($this->returnSelf());
+        $quoteItem->expects($this->once())->method('setStockStateResult')->with($result)->will($this->returnSelf());
 
         $this->model->initialize($stockItem, $quoteItem, $qty);
     }

dev/tests/integration/testsuite/Magento/CatalogInventory/Model/Quote/Item/QuantityValidatorTest.php

@@ -130,10 +130,31 @@ public function testQuoteWithOptionsWithErrors()
         $this->stockState->expects($this->any())->method('checkQtyIncrements')->willReturn($resultMock);
         $this->optionInitializer->expects($this->any())->method('initialize')->willReturn($resultMock);
         $resultMock->expects($this->any())->method('getHasError')->willReturn(true);
+        $this->setMockStockStateResultToQuoteItemOptions($quoteItem, $resultMock);
         $this->observer->execute($this->observerMock);
         $this->assertCount(2, $quoteItem->getErrorInfos(), 'Expected 2 errors in QuoteItem');
     }
 
+    /**
+     * Set mock of Stock State Result to Quote Item Options.
+     *
+     *
+     * @param \Magento\Quote\Model\Quote\Item $quoteItem
+     * @param \PHPUnit_Framework_MockObject_MockObject $resultMock
+     */
+    private function setMockStockStateResultToQuoteItemOptions($quoteItem, $resultMock)
+    {
+        if ($options = $quoteItem->getQtyOptions()) {
+            foreach ($options as $option) {
+                $option->setStockStateResult($resultMock);
+            }
+
+            return;
+        }
+
+        $this->fail('Test failed since Quote Item does not have Qty options.');
+    }
+
     /**
      * Gets \Magento\Quote\Model\Quote\Item from \Magento\Quote\Model\Quote by product id
      *