I am new in writing unit testing in Magento 2. I want to write a test case for getting an order by the order_id.

Below is my model function:

 * Initialize dependencies
 * @param \Magento\Framework\Serialize\Serializer\Json $json
 * @param  Data $helper
 * @param \Magento\Framework\HTTP\Client\Curl $curl
 * @param \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig
 * @param Helper $websiteCheck
 * @param \Magento\Sales\Api\OrderRepositoryInterface $orderRepository
public function __construct(
    Json $json,
    Helper $helper,
    Curl $curl,
    \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
    Helper $websiteCheck,
    \Magento\Sales\Api\OrderRepositoryInterface $orderRepository
) {
    $this->json = $json;
    $this->helper = $helper;
    $this->curl = $curl;
    $this->_scopeConfig = $scopeConfig;
    $this->_websiteCheck = $websiteCheck;
    $this->orderRepository = $orderRepository;
    $this->_storeId = $this->_websiteCheck->getStoreId();

public function updateOrderStatus($orderId)
       if ($orderId) {
            $order = $this->orderRepository->get($orderId);
            $comment = "Order Status Changed to Sent to Warehouse";
            try {
} catch (\Exception $e) {

I have used \Magento\Sales\Api\OrderRepositoryInterface $orderRepository repository,

Below is my test case functions:

use Magento\Sales\Api\Data\OrderInterface;
use Magento\Sales\Api\OrderRepositoryInterface;

protected function setup(): void
           $this->_orderRepositoryInterface = $this->getMockBuilder(OrderRepositoryInterface::class)

        $this->orderMock = $this->getMockBuilder(OrderInterface::class)

          $this->objectManager = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);

          $this->model = $this->objectManager->getObject(
                'helper' => $this->helper,
                'json' => $this->json,
                'orderRepositoryInterface' => $this->_orderRepositoryInterface,
                'orderInterface' => $this->_orderInterface,
                'orderFactory' => $this->orderFactory

public function testUpdateOrderStatus()
    $orderID = '57956';




    $this->assertEquals(true, $this->model->updateOrderStatus($orderID));

$this->model is my original model class for which i am writing Test Unit. I am receiving error like below :

Error: Call to a member function setState() on null

As i said i am new in writing unit tests, so if anyone can get idea from above code then it will helpful for me.

Thanks in advance.

1 Answer 1


You have to add $this->orderMock as you added orderRepositoryInterface' => $this->_orderRepositoryInterface in setup:void funntion constructor.

  • I have already tried that $this->orderMock passed into Constructor in Test class's Setup but it didn't worked for me.
    – Rik Patel
    Jan 2, 2023 at 8:54
  • Can you please send original class constructor?
    – Ankit
    Jan 2, 2023 at 9:12
  • I have added constructor in the original question, can you please check that and let me know what i am doing wrong.
    – Rik Patel
    Jan 2, 2023 at 13:38

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