PromotionActionController example

$packager = $this->createMock(LineItemGroupCountPackager::class);
        $packager->method('getKey')->willReturn('test-packager');

        $sorter = $this->createMock(LineItemGroupPriceAscSorter::class);
        $sorter->method('getKey')->willReturn('test-sorter');

        $serviceRegistry = new LineItemGroupServiceRegistry(
            [$packager],
            [$sorter],
        );

        $this->promotionActionController = new PromotionActionController(
            $serviceRegistry
        );
    }

    public function testSetGroupPackager(): void
    {
        $response = $this->promotionActionController->getSetGroupPackagers();

        $content = $response->getContent();
        static::assertNotFalse($content);