f more comment, correct check

Author: TheBlueMatt

lightning/src/ln/functional_tests.rs

@@ -4744,7 +4744,7 @@ fn test_duplicate_payment_hash_one_failure_one_success() {
 		if node_txn.len() > 2 {
 			check_spends!(node_txn[1], commitment_txn[0]);
 			assert_eq!(node_txn[1].input.len(), 1);
-			assert_eq!(node_txn[2].output.len(), 1);
+			assert_eq!(node_txn[1].output.len(), 1);
 			assert_eq!(node_txn[0].input[0].previous_output, node_txn[1].input[0].previous_output);
 
 			check_spends!(node_txn[2], commitment_txn[0]);
@@ -4760,7 +4760,8 @@ fn test_duplicate_payment_hash_one_failure_one_success() {
 
 		assert_eq!(node_txn[0].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
 		assert_eq!(node_txn[1].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
-		// Assign htlc_timeout_tx to the second HTLC (with value ~800 sats).
+		// Assign htlc_timeout_tx to the forwarded HTLC (with value ~800 sats). The received HTLC
+		// (with value 900 sats) will be claimed in the below `claim_funds` call.
 		if node_txn.len() > 2 {
 			assert_eq!(node_txn[2].input[0].witness.last().unwrap().len(), ACCEPTED_HTLC_SCRIPT_WEIGHT);
 			htlc_timeout_tx = if node_txn[2].output[0].value < 900 { node_txn[2].clone() } else { node_txn[0].clone() };