feat(net): Arbitrary Prop Testing (#66)

### Description

Adds arbitrary property-based testing to `net` crate objects.

Cargo.toml

@@ -166,6 +166,10 @@ openssl = { version = "0.10.66", features = ["vendored"] }
 libp2p-identity = { version = "0.2.9", features = [ "secp256k1" ] }
 libp2p = { version = "0.54.0", features = ["macros", "tokio", "tcp", "noise", "gossipsub", "ping", "yamux"] }
 
+# Testing
+arbtest = "0.3"
+arbitrary = { version = "1", features = ["derive"] }
+
 # Misc
 tracing = "0.1.0"
 tracing-subscriber = "0.3.18"

crates/net/Cargo.toml

@@ -33,3 +33,14 @@ tokio.workspace = true
 tracing.workspace = true
 lazy_static.workspace = true
 unsigned-varint.workspace = true
+
+# `arbitrary` feature dependencies
+arbitrary = { workspace = true, optional = true }
+
+[dev-dependencies]
+arbtest.workspace = true
+arbitrary.workspace = true
+
+[features]
+default = []
+arbitrary = ["dep:arbitrary"]

crates/net/src/types/enr.rs

@@ -9,6 +9,7 @@ pub const OP_CL_KEY: &str = "opstack";
 
 /// The unique L2 network identifier
 #[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
+#[cfg_attr(any(test, feature = "arbitrary"), derive(arbitrary::Arbitrary))]
 pub struct OpStackEnr {
     /// Chain ID
     pub chain_id: u64,
@@ -64,7 +65,18 @@ mod tests {
     use alloy::primitives::{bytes, Bytes};
 
     #[test]
-    fn test_encode_decode_op_enr() {
+    fn roundtrip_op_stack_enr() {
+        arbtest::arbtest(|u| {
+            let op_stack_enr = OpStackEnr::new(u.arbitrary()?, 0);
+            let bytes = alloy_rlp::encode(op_stack_enr).to_vec();
+            let decoded = OpStackEnr::decode(&mut &bytes[..]).unwrap();
+            assert_eq!(decoded, op_stack_enr);
+            Ok(())
+        });
+    }
+
+    #[test]
+    fn test_op_mainnet_enr() {
         let op_enr = OpStackEnr::new(10, 0);
         let bytes = alloy_rlp::encode(op_enr).to_vec();
         assert_eq!(Bytes::from(bytes.clone()), bytes!("820A00"));
@@ -73,7 +85,7 @@ mod tests {
     }
 
     #[test]
-    fn test_encode_decode_base_enr() {
+    fn test_base_mainnet_enr() {
         let base_enr = OpStackEnr::new(8453, 0);
         let bytes = alloy_rlp::encode(base_enr).to_vec();
         assert_eq!(Bytes::from(bytes.clone()), bytes!("83854200"));