Dumplie\Customer\Domain\Products::getBySku PHP Method

    public function getBySku(SKU $sku) : Product;

 function it_can_be_used_to_place_order(Products $products, Carts $carts)
 {
     $product = new Product(new SKU("SKU"), Price::EUR(1000), true);
     $cart = new Cart(CartId::generate(), 'EUR');
     $cart->add($product, 1);
     $carts->getById(Argument::type(CartId::class))->willReturn($cart);
     $products->getBySku(Argument::type(SKU::class))->willReturn($product);
     $order = $this->placeOrder(OrderId::generate(), $products, $carts);
     $order->shouldBeAnInstanceOf(Order::class);
 }