Add write+read serialization test

Author: optout21

lightning/src/ln/channel.rs

@@ -7531,6 +7531,7 @@ mod tests {
 	use crate::util::config::UserConfig;
 	use crate::util::enforcing_trait_impls::EnforcingSigner;
 	use crate::util::errors::APIError;
+	use crate::util::ser::{Readable, Writeable};
 	use crate::util::test_utils;
 	use crate::util::test_utils::OnGetShutdownScriptpubkey;
 	use bitcoin::secp256k1::{Secp256k1, ecdsa::Signature};
@@ -7542,6 +7543,7 @@ mod tests {
 	use bitcoin::PackedLockTime;
 	use bitcoin::util::address::WitnessVersion;
 	use crate::prelude::*;
+	use crate::io;
 
 	struct TestFeeEstimator {
 		fee_est: u32
@@ -7555,7 +7557,7 @@ mod tests {
 	#[test]
 	fn test_channel_id_new_from_data() {
 		let data: [u8; 32] = [2; 32];
-		let channel_id = ChannelId::from_bytes([2; 32]);
+		let channel_id = ChannelId::from_bytes(data.clone());
 		assert_eq!(*channel_id.bytes(), data);
 	}
 
@@ -7574,6 +7576,19 @@ mod tests {
 		assert_ne!(channel_id11, channel_id21);
 	}
 
+	#[test]
+	fn test_channel_id_write_read() {
+		let data: [u8; 32] = [2; 32];
+		let channel_id = ChannelId::from_bytes(data.clone());
+
+		let mut w = test_utils::TestVecWriter(Vec::new());
+		channel_id.write(&mut w).unwrap();
+
+		let channel_id_2 = ChannelId::read(&mut io::Cursor::new(&w.0)).unwrap();
+		assert_eq!(channel_id_2, channel_id);
+		assert_eq!(channel_id_2.bytes(), &data);
+	}
+
 	#[test]
 	fn test_max_funding_satoshis_no_wumbo() {
 		assert_eq!(TOTAL_BITCOIN_SUPPLY_SATOSHIS, 21_000_000 * 100_000_000);