Add parsing tests for experimental refund TLVs

Author: jkczyz

lightning/src/offers/refund.rs

@@ -997,7 +997,7 @@ mod tests {
 	use crate::ln::features::{InvoiceRequestFeatures, OfferFeatures};
 	use crate::ln::inbound_payment::ExpandedKey;
 	use crate::ln::msgs::{DecodeError, MAX_VALUE_MSAT};
-	use crate::offers::invoice_request::{ExperimentalInvoiceRequestTlvStreamRef, INVOICE_REQUEST_TYPES, InvoiceRequestTlvStreamRef};
+	use crate::offers::invoice_request::{EXPERIMENTAL_INVOICE_REQUEST_TYPES, ExperimentalInvoiceRequestTlvStreamRef, INVOICE_REQUEST_TYPES, InvoiceRequestTlvStreamRef};
 	use crate::offers::nonce::Nonce;
 	use crate::offers::offer::{ExperimentalOfferTlvStreamRef, OfferTlvStreamRef};
 	use crate::offers::parse::{Bolt12ParseError, Bolt12SemanticError};
@@ -1621,6 +1621,43 @@ mod tests {
 		}
 	}
 
+	#[test]
+	fn parses_refund_with_experimental_tlv_records() {
+		const UNKNOWN_ODD_TYPE: u64 = EXPERIMENTAL_INVOICE_REQUEST_TYPES.start + 1;
+		assert!(UNKNOWN_ODD_TYPE % 2 == 1);
+
+		let refund = RefundBuilder::new(vec![1; 32], payer_pubkey(), 1000).unwrap()
+			.build().unwrap();
+
+		let mut encoded_refund = Vec::new();
+		refund.write(&mut encoded_refund).unwrap();
+		BigSize(UNKNOWN_ODD_TYPE).write(&mut encoded_refund).unwrap();
+		BigSize(32).write(&mut encoded_refund).unwrap();
+		[42u8; 32].write(&mut encoded_refund).unwrap();
+
+		match Refund::try_from(encoded_refund.clone()) {
+			Ok(refund) => assert_eq!(refund.bytes, encoded_refund),
+			Err(e) => panic!("error parsing refund: {:?}", e),
+		}
+
+		const UNKNOWN_EVEN_TYPE: u64 = EXPERIMENTAL_INVOICE_REQUEST_TYPES.start;
+		assert!(UNKNOWN_EVEN_TYPE % 2 == 0);
+
+		let refund = RefundBuilder::new(vec![1; 32], payer_pubkey(), 1000).unwrap()
+			.build().unwrap();
+
+		let mut encoded_refund = Vec::new();
+		refund.write(&mut encoded_refund).unwrap();
+		BigSize(UNKNOWN_EVEN_TYPE).write(&mut encoded_refund).unwrap();
+		BigSize(32).write(&mut encoded_refund).unwrap();
+		[42u8; 32].write(&mut encoded_refund).unwrap();
+
+		match Refund::try_from(encoded_refund) {
+			Ok(_) => panic!("expected error"),
+			Err(e) => assert_eq!(e, Bolt12ParseError::Decode(DecodeError::UnknownRequiredFeature)),
+		}
+	}
+
 	#[test]
 	fn fails_parsing_refund_with_out_of_range_tlv_records() {
 		let secp_ctx = Secp256k1::new();
@@ -1638,5 +1675,16 @@ mod tests {
 			Ok(_) => panic!("expected error"),
 			Err(e) => assert_eq!(e, Bolt12ParseError::Decode(DecodeError::InvalidValue)),
 		}
+
+		let mut encoded_refund = Vec::new();
+		refund.write(&mut encoded_refund).unwrap();
+		BigSize(EXPERIMENTAL_INVOICE_REQUEST_TYPES.end).write(&mut encoded_refund).unwrap();
+		BigSize(32).write(&mut encoded_refund).unwrap();
+		[42u8; 32].write(&mut encoded_refund).unwrap();
+
+		match Refund::try_from(encoded_refund) {
+			Ok(_) => panic!("expected error"),
+			Err(e) => assert_eq!(e, Bolt12ParseError::Decode(DecodeError::InvalidValue)),
+		}
 	}
 }