StockUpdater example

$existence = new EntityExistence('order_line_item', [], false, false, false, []);
        $path = 'order_line_items';

        $commands = [new UpdateCommand(
            $definition,
            ['referenced_id' => 'new_referenced_id'],
            $primaryKey,
            $existence,
            $path
        )];

        $stockSubscriber = new StockUpdater(
            $this->getConnectionMock(),
            $this->dispatcher,
            new StockUpdateFilterProvider([]),
        );

        $writeContextMock = $this->getMockBuilder(WriteContext::class)
            ->disableOriginalConstructor()
            ->getMock();

        $event = new PreWriteValidationEvent($writeContextMock, $commands);
        $stockSubscriber->triggerChangeSet($event);