test: test that incorrect final cltv errors

Author: vladimirfomene

lightning/src/ln/channelmanager.rs

@@ -11049,6 +11049,29 @@ mod tests {
 			sender_intended_amt_msat - extra_fee_msat, 42, None, true, Some(extra_fee_msat)).is_ok());
 	}
 
+	#[test]
+	fn test_final_incorrect_cltv(){
+		let chanmon_cfg = create_chanmon_cfgs(1);
+		let node_cfg = create_node_cfgs(1, &chanmon_cfg);
+		let node_chanmgr = create_node_chanmgrs(1, &node_cfg, &[None]);
+		let node = create_network(1, &node_cfg, &node_chanmgr);
+
+		let result = node[0].node.construct_recv_pending_htlc_info(msgs::InboundOnionPayload::Receive {
+			amt_msat: 100,
+			outgoing_cltv_value: 10,
+			payment_metadata: None,
+			keysend_preimage: None,
+			payment_data: Some(msgs::FinalOnionHopData {
+				payment_secret: PaymentSecret([0; 32]), total_msat: 100,
+			}),
+			custom_tlvs: Vec::new(),
+		}, [0; 32], PaymentHash([0; 32]), 100, 11, None, true, None);
+
+		if let Err(crate::ln::channelmanager::InboundOnionErr { msg, .. }) = result {
+			assert_eq!(msg, "The final CLTV expiry is too soon to handle");
+		} else { panic!(); }
+	}
+
 	#[test]
 	fn test_inbound_anchors_manual_acceptance() {
 		// Tests that we properly limit inbound channels when we have the manual-channel-acceptance