DiscountFacade example

        $definition = $this->buildDiscountDefinition($type, $value, $key);

        $item = new LineItem($key, LineItem::DISCOUNT_LINE_ITEM, null, 1);
        $item->setGood(false);
        $item->setRemovable(true);
        $item->setPriceDefinition($definition);
        $item->setLabel($label);
        $item->setRemovable(true);
        $this->getItems()->add($item);

        return new DiscountFacade($item);
    }

    private function getItems(): LineItemCollection
    {
        return $this->items;
    }

    /** * @param float|PriceCollection|string|int|null $value */
    private function buildDiscountDefinition(string $type, $value, string $key): PriceDefinitionInterface
    {

/** * @internal * * @covers \Shopware\Core\Checkout\Cart\Facade\DiscountFacade */
class DiscountFacadeTest extends TestCase
{
    public function testPublicApiAvailable(): void
    {
        $item = new LineItem('foo', 'foo', 'foo');
        $item->setLabel('foo');
        $facade = new DiscountFacade($item);

        static::assertEquals('foo', $facade->getId());
        static::assertEquals('foo', $facade->getLabel());
    }
}

public function surcharge(string $key, string $type, float|PriceCollection $value, string $label): DiscountFacade
    {
        $definition = $this->buildSurchargeDefinition($type, $value, $key);

        $item = new LineItem($key, LineItem::DISCOUNT_LINE_ITEM, null, 1);
        $item->setGood(false);
        $item->setPriceDefinition($definition);
        $item->setLabel($label);
        $item->setRemovable(true);
        $this->getItems()->add($item);

        return new DiscountFacade($item);
    }

    private function getItems(): LineItemCollection
    {
        return $this->items;
    }

    private function buildSurchargeDefinition(string $type, float|PriceCollection|string|int $value, string $key): PriceDefinitionInterface
    {
        if ($type === PercentagePriceDefinition::TYPE) {
            if ($value instanceof PriceCollection) {