public function testAddItemsToProducts()
{
$storeId = 3;
$productOneId = 1;
$productOneStatus = \Magento\CatalogInventory\Model\Stock\Status::STATUS_IN_STOCK;
$productTwoId = 2;
$productThreeId = 3;
$stockItemProductId = $productOneId;
$stockItemStockId = \Magento\CatalogInventory\Model\Stock::DEFAULT_STOCK_ID;
$productCollection = $this->getMockBuilder('Magento\\Catalog\\Model\\Resource\\Product\\Collection')->disableOriginalConstructor()->setMethods(['getStoreId', 'getIterator'])->getMock();
$stockItem = $this->getMockBuilder('Magento\\CatalogInventory\\Model\\Stock\\Item')->disableOriginalConstructor()->getMock();
$stockItem->expects($this->atLeastOnce())->method('getProductId')->will($this->returnValue($stockItemProductId));
$stockItem->expects($this->atLeastOnce())->method('getStockId')->will($this->returnValue($stockItemStockId));
$itemCollection = $this->getMockBuilder('Magento\\CatalogInventory\\Model\\Resource\\Stock\\Item\\Collection')->disableOriginalConstructor()->getMock();
$itemCollection->expects($this->atLeastOnce())->method('addStockFilter')->with(Stock::DEFAULT_STOCK_ID)->will($this->returnSelf());
$itemCollection->expects($this->atLeastOnce())->method('addProductsFilter')->with($productCollection)->will($this->returnSelf());
$itemCollection->expects($this->atLeastOnce())->method('joinStockStatus')->with($storeId)->will($this->returnSelf());
$itemCollection->expects($this->atLeastOnce())->method('load')->will($this->returnValue([$stockItem]));
$this->collectionFactory->expects($this->atLeastOnce())->method('create')->will($this->returnValue($itemCollection));
$productOne = $this->getMockBuilder('Magento\\Catalog\\Model\\Product')->disableOriginalConstructor()->setMethods(['getId', 'getStockStatus', '__wakeup'])->getMock();
$productOne->expects($this->atLeastOnce())->method('getId')->will($this->returnValue($productOneId));
$productOne->expects($this->atLeastOnce())->method('getStockStatus')->will($this->returnValue($productOneStatus));
$productTwo = $this->getMockBuilder('Magento\\Catalog\\Model\\Product')->disableOriginalConstructor()->getMock();
$productTwo->expects($this->atLeastOnce())->method('getId')->will($this->returnValue($productTwoId));
$productThree = $this->getMockBuilder('Magento\\Catalog\\Model\\Product')->disableOriginalConstructor()->getMock();
$productThree->expects($this->atLeastOnce())->method('getId')->will($this->returnValue($productThreeId));
$productCollection->expects($this->atLeastOnce())->method('getStoreId')->will($this->returnValue($storeId));
$productCollection->expects($this->any())->method('getIterator')->will($this->returnValue(new \ArrayIterator([$productOne, $productTwo, $productThree])));
$this->stockStatus->expects($this->once())->method('assignProduct')->with($productOne, $stockItemStockId, $productOneStatus);
$this->assertEquals($this->model, $this->model->addItemsToProducts($productCollection));
}