diff --git a/crates/node/config/src/execution.rs b/crates/node/config/src/execution.rs
index 55d77b4..17efdfb 100644
--- a/crates/node/config/src/execution.rs
+++ b/crates/node/config/src/execution.rs
@@ -33,3 +33,58 @@ const fn default_gas_limit() -> u64 {
 const fn default_block_time() -> u64 {
     DEFAULT_BLOCK_TIME
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_default_execution_config() {
+        let config = ExecutionConfig::default();
+        assert_eq!(config.gas_limit, DEFAULT_GAS_LIMIT);
+        assert_eq!(config.block_time, DEFAULT_BLOCK_TIME);
+    }
+
+    #[test]
+    fn test_execution_config_serde_roundtrip() {
+        let config = ExecutionConfig { gas_limit: 50_000_000, block_time: 5 };
+        let serialized = serde_json::to_string(&config).expect("serialize");
+        let deserialized: ExecutionConfig = serde_json::from_str(&serialized).expect("deserialize");
+        assert_eq!(config, deserialized);
+    }
+
+    #[test]
+    fn test_execution_config_toml_roundtrip() {
+        let config = ExecutionConfig { gas_limit: 15_000_000, block_time: 1 };
+        let serialized = toml::to_string(&config).expect("serialize toml");
+        let deserialized: ExecutionConfig = toml::from_str(&serialized).expect("deserialize toml");
+        assert_eq!(config, deserialized);
+    }
+
+    #[test]
+    fn test_execution_config_serde_defaults() {
+        let config: ExecutionConfig = serde_json::from_str("{}").expect("deserialize");
+        assert_eq!(config.gas_limit, DEFAULT_GAS_LIMIT);
+        assert_eq!(config.block_time, DEFAULT_BLOCK_TIME);
+    }
+
+    #[test]
+    fn test_execution_config_partial_defaults() {
+        let config: ExecutionConfig =
+            serde_json::from_str(r#"{"gas_limit": 10000000}"#).expect("deserialize");
+        assert_eq!(config.gas_limit, 10_000_000);
+        assert_eq!(config.block_time, DEFAULT_BLOCK_TIME);
+
+        let config: ExecutionConfig =
+            serde_json::from_str(r#"{"block_time": 10}"#).expect("deserialize");
+        assert_eq!(config.gas_limit, DEFAULT_GAS_LIMIT);
+        assert_eq!(config.block_time, 10);
+    }
+
+    #[test]
+    fn test_execution_config_clone_and_eq() {
+        let config = ExecutionConfig { gas_limit: 999, block_time: 42 };
+        assert_eq!(config, config.clone());
+        assert_ne!(config, ExecutionConfig::default());
+    }
+}
diff --git a/crates/node/config/src/network.rs b/crates/node/config/src/network.rs
index 3df1afe..497b165 100644
--- a/crates/node/config/src/network.rs
+++ b/crates/node/config/src/network.rs
@@ -35,3 +35,76 @@ impl Default for NetworkConfig {
 fn default_listen_addr() -> String {
     DEFAULT_LISTEN_ADDR.to_string()
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_default_network_config() {
+        let config = NetworkConfig::default();
+        assert_eq!(config.listen_addr, DEFAULT_LISTEN_ADDR);
+        assert!(config.dialable_addr.is_none());
+        assert!(config.bootstrap_peers.is_empty());
+    }
+
+    #[test]
+    fn test_network_config_serde_roundtrip() {
+        let config = NetworkConfig {
+            listen_addr: "127.0.0.1:9000".to_string(),
+            dialable_addr: Some("1.2.3.4:9000".to_string()),
+            bootstrap_peers: vec!["peer1:30303".to_string()],
+        };
+        let serialized = serde_json::to_string(&config).expect("serialize");
+        let deserialized: NetworkConfig = serde_json::from_str(&serialized).expect("deserialize");
+        assert_eq!(config, deserialized);
+    }
+
+    #[test]
+    fn test_network_config_toml_roundtrip() {
+        let config = NetworkConfig {
+            listen_addr: "0.0.0.0:8080".to_string(),
+            dialable_addr: None,
+            bootstrap_peers: vec!["node1.example.com:30303".to_string()],
+        };
+        let serialized = toml::to_string(&config).expect("serialize toml");
+        let deserialized: NetworkConfig = toml::from_str(&serialized).expect("deserialize toml");
+        assert_eq!(config, deserialized);
+    }
+
+    #[test]
+    fn test_network_config_serde_defaults() {
+        let config: NetworkConfig = serde_json::from_str("{}").expect("deserialize");
+        assert_eq!(config.listen_addr, DEFAULT_LISTEN_ADDR);
+        assert!(config.dialable_addr.is_none());
+        assert!(config.bootstrap_peers.is_empty());
+    }
+
+    #[test]
+    fn test_network_config_dialable_addr_skip_serializing_when_none() {
+        let config = NetworkConfig::default();
+        let serialized = serde_json::to_string(&config).expect("serialize");
+        assert!(!serialized.contains("dialable_addr"));
+    }
+
+    #[test]
+    fn test_network_config_dialable_addr_serialized_when_some() {
+        let config = NetworkConfig {
+            dialable_addr: Some("1.2.3.4:30303".to_string()),
+            ..Default::default()
+        };
+        let serialized = serde_json::to_string(&config).expect("serialize");
+        assert!(serialized.contains("dialable_addr"));
+    }
+
+    #[test]
+    fn test_network_config_clone_and_eq() {
+        let config = NetworkConfig {
+            listen_addr: "10.0.0.1:5555".to_string(),
+            dialable_addr: Some("external.host:5555".to_string()),
+            bootstrap_peers: vec!["a".to_string()],
+        };
+        assert_eq!(config, config.clone());
+        assert_ne!(config, NetworkConfig::default());
+    }
+}
diff --git a/crates/node/config/src/rpc.rs b/crates/node/config/src/rpc.rs
index e4d5ebc..53bb469 100644
--- a/crates/node/config/src/rpc.rs
+++ b/crates/node/config/src/rpc.rs
@@ -33,3 +33,65 @@ fn default_http_addr() -> String {
 fn default_ws_addr() -> String {
     DEFAULT_WS_ADDR.to_string()
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_default_rpc_config() {
+        let config = RpcConfig::default();
+        assert_eq!(config.http_addr, DEFAULT_HTTP_ADDR);
+        assert_eq!(config.ws_addr, DEFAULT_WS_ADDR);
+    }
+
+    #[test]
+    fn test_rpc_config_serde_roundtrip() {
+        let config = RpcConfig {
+            http_addr: "127.0.0.1:8080".to_string(),
+            ws_addr: "127.0.0.1:8081".to_string(),
+        };
+        let serialized = serde_json::to_string(&config).expect("serialize");
+        let deserialized: RpcConfig = serde_json::from_str(&serialized).expect("deserialize");
+        assert_eq!(config, deserialized);
+    }
+
+    #[test]
+    fn test_rpc_config_toml_roundtrip() {
+        let config = RpcConfig {
+            http_addr: "0.0.0.0:9545".to_string(),
+            ws_addr: "0.0.0.0:9546".to_string(),
+        };
+        let serialized = toml::to_string(&config).expect("serialize toml");
+        let deserialized: RpcConfig = toml::from_str(&serialized).expect("deserialize toml");
+        assert_eq!(config, deserialized);
+    }
+
+    #[test]
+    fn test_rpc_config_serde_defaults() {
+        let config: RpcConfig = serde_json::from_str("{}").expect("deserialize");
+        assert_eq!(config.http_addr, DEFAULT_HTTP_ADDR);
+        assert_eq!(config.ws_addr, DEFAULT_WS_ADDR);
+    }
+
+    #[test]
+    fn test_rpc_config_partial_defaults() {
+        let config: RpcConfig =
+            serde_json::from_str(r#"{"http_addr": "1.2.3.4:8545"}"#).expect("deserialize");
+        assert_eq!(config.http_addr, "1.2.3.4:8545");
+        assert_eq!(config.ws_addr, DEFAULT_WS_ADDR);
+
+        let config: RpcConfig =
+            serde_json::from_str(r#"{"ws_addr": "5.6.7.8:8546"}"#).expect("deserialize");
+        assert_eq!(config.http_addr, DEFAULT_HTTP_ADDR);
+        assert_eq!(config.ws_addr, "5.6.7.8:8546");
+    }
+
+    #[test]
+    fn test_rpc_config_clone_and_eq() {
+        let config =
+            RpcConfig { http_addr: "custom:1111".to_string(), ws_addr: "custom:2222".to_string() };
+        assert_eq!(config, config.clone());
+        assert_ne!(config, RpcConfig::default());
+    }
+}