use objectmanager helper

Author: karyna-t

app/code/Magento/Reports/Test/Unit/Observer/CheckoutCartAddProductObserverTest.php

@@ -10,6 +10,7 @@
 
 use Magento\Framework\Event;
 use Magento\Framework\Event\Observer;
+use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;
 use Magento\Quote\Model\Quote\Item as QuoteItem;
 use Magento\Reports\Model\Event as ReportsEventModel;
 use Magento\Reports\Model\ReportStatus;
@@ -74,6 +75,14 @@ protected function setUp()
             $this->eventSaverMock,
             $this->reportStatusMock
         );
+        $objectManager = new ObjectManager($this);
+        $this->observer = $objectManager->getObject(
+            CheckoutCartAddProductObserver::class,
+            [
+                'eventSaver' => $this->eventSaverMock,
+                'reportStatus' => $this->reportStatusMock
+            ]
+        );
     }
 
     /**