f - test InvoiceRequestFields serialization

Author: jkczyz

lightning/src/offers/invoice_request.rs

@@ -1206,7 +1206,7 @@ mod tests {
 	use crate::offers::parse::{Bolt12ParseError, Bolt12SemanticError};
 	use crate::offers::payer::PayerTlvStreamRef;
 	use crate::offers::test_utils::*;
-	use crate::util::ser::{BigSize, Writeable};
+	use crate::util::ser::{BigSize, Readable, Writeable};
 	use crate::util::string::{PrintableString, UntrustedString};
 
 	#[test]
@@ -2271,9 +2271,10 @@ mod tests {
 			.sign(payer_sign).unwrap();
 		match invoice_request.verify(&expanded_key, &secp_ctx) {
 			Ok(invoice_request) => {
+				let fields = invoice_request.fields();
 				assert_eq!(invoice_request.offer_id, offer.id());
 				assert_eq!(
-					invoice_request.fields(),
+					fields,
 					InvoiceRequestFields {
 						payer_id: payer_pubkey(),
 						amount_msats: Some(1001),
@@ -2282,6 +2283,13 @@ mod tests {
 						payer_note_truncated: Some(UntrustedString("0".repeat(PAYER_NOTE_LIMIT))),
 					}
 				);
+
+				let mut buffer = Vec::new();
+				fields.write(&mut buffer).unwrap();
+
+				let deserialized_fields: InvoiceRequestFields =
+					Readable::read(&mut buffer.as_slice()).unwrap();
+				assert_eq!(deserialized_fields, fields);
 			},
 			Err(_) => panic!("unexpected error"),
 		}