Add failure case on test unblided receive

Previously this commit, test only check for succesfully claimed case. Now tests
that successfully fail the HTLC and sender can read the error.

Author: a-mpch

lightning/src/ln/blinded_payment_tests.rs

@@ -2274,8 +2274,7 @@ fn test_trampoline_single_hop_receive() {
 	do_test_trampoline_single_hop_receive(false);
 }
 
-#[test]
-fn test_trampoline_unblinded_receive() {
+fn do_test_trampoline_unblinded_receive(success: bool) {
 	// Simulate a payment of A (0) -> B (1) -> C(Trampoline) (2)
 
 	const TOTAL_NODE_COUNT: usize = 3;
@@ -2416,8 +2415,17 @@ fn test_trampoline_unblinded_receive() {
 	let args = PassAlongPathArgs::new(&nodes[0], route, amt_msat, payment_hash, first_message_event)
 		.with_payment_secret(payment_secret);
 	do_pass_along_path(args);
+	if success {
+		claim_payment(&nodes[0], &[&nodes[1], &nodes[2]], payment_preimage);
+	} else {
+		fail_payment(&nodes[0], &[&nodes[1], &nodes[2]], payment_hash);
+	}
+}
 
-	claim_payment(&nodes[0], &[&nodes[1], &nodes[2]], payment_preimage);
+#[test]
+fn test_trampoline_unblinded_receive() {
+    do_test_trampoline_unblinded_receive(true);
+    do_test_trampoline_unblinded_receive(false);
 }
 
 #[test]