fix(ics008): make sure we are encoding snake case

Signed-off-by: aeryz <abdullaheryz@protonmail.com>

lib/ics-008-wasm-client/Cargo.toml

@@ -13,3 +13,6 @@ prost = { version = "0.11", default-features = false }
 protos = { workspace = true, default-features = false, features = ["proto_full", "std"] }
 serde = { version = "1.0", default-features = false, features = ["derive"] }
 unionlabs = { workspace = true, default-features = false }
+
+[dev-dependencies]
+serde_json = "1.0.0"

lib/ics-008-wasm-client/src/msg.rs

@@ -14,6 +14,7 @@ pub struct MerklePath {
 }
 
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+#[serde(deny_unknown_fields, rename_all = "snake_case")]
 pub enum ClientMessage {
     Header(Header),
     Misbehaviour(Misbehaviour),
@@ -136,3 +137,32 @@ impl From<Status> for QueryResponse {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use protos::ibc::lightclients::wasm::v1::Header;
+
+    use crate::{ClientMessage, ExecuteMsg};
+
+    #[test]
+    fn execute_msg_snake_case_encoded() {
+        let msg = ExecuteMsg::CheckSubstituteAndUpdateState {};
+        assert_eq!(
+            serde_json::to_string(&msg).unwrap(),
+            r#"{"check_substitute_and_update_state":{}}"#
+        )
+    }
+
+    #[test]
+    fn client_msg_snake_case_encoded() {
+        let msg = ClientMessage::Header(Header {
+            data: vec![],
+            height: None,
+        });
+
+        assert_eq!(
+            serde_json::to_string(&msg).unwrap(),
+            r#"{"header":{"data":"","height":null}}"#
+        )
+    }
+}