f - parsing test for going over MAX_VALUE_MSAT

Author: jkczyz

lightning/src/offers/offer.rs

@@ -876,6 +876,18 @@ mod tests {
 			Ok(_) => panic!("expected error"),
 			Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::MissingAmount)),
 		}
+
+		let mut tlv_stream = offer.as_tlv_stream();
+		tlv_stream.amount = Some(MAX_VALUE_MSAT + 1);
+		tlv_stream.currency = None;
+
+		let mut encoded_offer = Vec::new();
+		tlv_stream.write(&mut encoded_offer).unwrap();
+
+		match Offer::try_from(encoded_offer) {
+			Ok(_) => panic!("expected error"),
+			Err(e) => assert_eq!(e, ParseError::InvalidSemantics(SemanticError::InvalidAmount)),
+		}
 	}
 
 	#[test]