fetchListing example

$this->getContainer()->get('event_dispatcher')->addListener(ProductListingResolvePreviewEvent::class, $listener);
        $context = $this->getContainer()->get(SalesChannelContextFactory::class)->create(Uuid::randomHex(), TestDefaults::SALES_CHANNEL);

        $criteria = new Criteria($ids->getList(['p1']));
        $this->productListingLoader->load($criteria, $context);
    }

    public function testMainVariant(): void
    {
        $this->createProduct([], true);

        $listing = $this->fetchListing();

        static::assertEquals(1, $listing->getTotal());

        $mainVariant = $listing->getEntities()->first();
        static::assertNotNull($mainVariant);

        static::assertEquals($this->mainVariantId, $mainVariant->getId());
        static::assertContains($this->optionIds['red'], $mainVariant->getOptionIds() ?: []);
        static::assertContains($this->optionIds['l'], $mainVariant->getOptionIds() ?: []);
        static::assertTrue($mainVariant->hasExtension('search'));

        

        $this->repository = $this->getContainer()->get('product.repository');
        $this->connection = $this->getContainer()->get(Connection::class);

        parent::setUp();
    }

    public function testSingleGroup(): void
    {
        $this->createProduct(['color']);

        $listing = $this->fetchListing();

        static::assertCount(2, $listing->ids);

        static::assertContains($this->optionIds['green'], $listing->optionIds);
        static::assertContains($this->optionIds['red'], $listing->optionIds);
    }

    public function testTwoGroups(): void
    {
        $this->createProduct(['color', 'size']);