8022: Uncaught Error: Call to a member function addItem() on array in app/code/Magento/Sales/Model/Order/Shipment.php

Author: RomaKis

app/code/Magento/Sales/Test/Unit/Model/ResourceModel/Order/Shipment/RelationTest.php

@@ -86,7 +86,8 @@ protected function setUp()
                     'getId',
                     'getItems',
                     'getTracks',
-                    'getComments'
+                    'getComments',
+                    'getTracksCollection',
                 ]
             )
             ->getMock();
@@ -123,7 +124,7 @@ public function testProcessRelations()
             ->method('getComments')
             ->willReturn([$this->commentMock]);
         $this->shipmentMock->expects($this->exactly(2))
-            ->method('getTracks')
+            ->method('getTracksCollection')
             ->willReturn([$this->trackMock]);
         $this->itemMock->expects($this->once())
             ->method('setParentId')