public void adminUpdateCartAsHalJson() throws Exception {
// Starting condition is Alice has {book1: 1, book2: 2}
// Ending condition is Alice has {book1: 0, book2: 2, book3: 3}
AdminUpdateCartDto updateCartRequest = new AdminUpdateCartDto();
// Add a few new items
updateCartRequest.getCartItems().add(new PublicCartItemDto("0316184136",3));
// Remove by setting to zero
updateCartRequest.getCartItems().add(new PublicCartItemDto("0099410672",0));
URI uri = UriBuilder.fromPath(CartLinks.ADMIN_SELF_TEMPLATE).build(1);
String actualResponse = configureAsClient(uri)
.accept(HalMediaType.APPLICATION_HAL_JSON)