callbackPaymentMethodSwitcherReturnOriginalMethod example

    private function getStorefrontCartFacade(Cart $cart, ?callable $shippingSwitcherCallbackMethod = null, ?callable $paymentSwitcherCallbackMethod = null): StorefrontCartFacade
    {
        $cartService = $this->createMock(CartService::class);
        $cartService->method('getCart')->willReturn($cart);

        $blockedShippingMethodSwitcher = $this->createMock(BlockedShippingMethodSwitcher::class);
        $blockedShippingMethodSwitcher->method('switch')->willReturnCallback($shippingSwitcherCallbackMethod ?? $this->callbackShippingMethodSwitcherReturnOriginalMethod(...));

        $blockedPaymentMethodSwitcher = $this->createMock(BlockedPaymentMethodSwitcher::class);
        $blockedPaymentMethodSwitcher->method('switch')->willReturnCallback($paymentSwitcherCallbackMethod ?? $this->callbackPaymentMethodSwitcherReturnOriginalMethod(...));

        $contextSwitchRoute = $this->createMock(ContextSwitchRoute::class);

        $cartCalculator = $this->createMock(CartCalculator::class);
        $cartCalculator->method('calculate')->willReturnArgument(0);

        $cartPersister = $this->createMock(CartPersister::class);

        return new StorefrontCartFacade(
            $cartService,
            $blockedShippingMethodSwitcher,