assert_eq!(unsigned_invoice_request.payer_metadata(), &[1; 32]);
assert_eq!(unsigned_invoice_request.chains(), vec![ChainHash::using_genesis_block(Network::Bitcoin)]);
assert_eq!(unsigned_invoice_request.metadata(), None);
assert_eq!(unsigned_invoice_request.payer_metadata(), &[1; 32]);
assert_eq!(unsigned_invoice_request.chains(), vec![ChainHash::using_genesis_block(Network::Bitcoin)]);
assert_eq!(unsigned_invoice_request.metadata(), None);