OptionsAvailabilityTest.php

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<?php
declare(strict_types=1);

namespace Magento\InventoryConfigurableProduct\Test\Integration\Options;

use Magento\Catalog\Api\ProductRepositoryInterface;
use Magento\ConfigurableProduct\Block\Product\View\Type\Configurable as ConfigurableView;
use Magento\Framework\Serialize\SerializerInterface;
use Magento\Store\Model\StoreManagerInterface;
use Magento\TestFramework\Helper\Bootstrap;
use PHPUnit\Framework\TestCase;

class OptionsAvailabilityTest extends TestCase
{
    private $storeManager;

    private $productRepository;

    private $configurableView;

    private $serializer;

    protected function setUp()
    {
        parent::setUp();

        $this->storeManager = Bootstrap::getObjectManager()->get(StoreManagerInterface::class);
        $this->configurableView = Bootstrap::getObjectManager()->get(ConfigurableView::class);
        $this->productRepository = Bootstrap::getObjectManager()->get(ProductRepositoryInterface::class);
        $this->serializer = Bootstrap::getObjectManager()->get(SerializerInterface::class);
    }

    public function testGetSalableOptions(string $storeCode, int $expected)
    {
        $this->storeManager->setCurrentStore($storeCode);

        $configurableProduct = $this->productRepository->get('configurable', false, null, true);
        $this->configurableView->setProduct($configurableProduct);
        $result = $this->serializer->unserialize($this->configurableView->getJsonConfig());
        $attributes = reset($result['attributes']);
        $actual = count($attributes['options'] ?? []);

        $this->assertEquals(
            $expected,
            $actual
        );
    }

    public function getSalableOptionsDataProvider()
    {
        return [
            [
                'store_for_eu_website',
                0
            ],
            [
                'store_for_us_website',
                2
            ],
        ];
    }
}