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