fix: added a dedicated test to confirm that serde_json correctly handles JSON strings with leading and trailing whitespace (#15789)

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>

Cargo.lock

@@ -8250,6 +8250,7 @@ dependencies = [
  "pin-project",
  "rand 0.9.0",
  "reth-tracing",
+ "serde",
  "serde_json",
  "thiserror 2.0.12",
  "tokio",

crates/rpc/ipc/Cargo.toml

@@ -32,5 +32,6 @@ interprocess = { workspace = true, features = ["tokio"] }
 
 [dev-dependencies]
 tokio-stream = { workspace = true, features = ["sync"] }
+serde.workspace = true
 reth-tracing.workspace = true
 rand.workspace = true

crates/rpc/ipc/src/stream_codec.rs

@@ -300,4 +300,18 @@ mod tests {
         assert_eq!(request, "{ test: 1 }");
         assert_eq!(request2, "{ test: 2 }");
     }
+
+    #[test]
+    fn serde_json_accepts_whitespace_wrapped_json() {
+        let json = "   { \"key\": \"value\" }   ";
+
+        #[derive(serde::Deserialize, Debug, PartialEq)]
+        struct Obj {
+            key: String,
+        }
+
+        let parsed: Result<Obj, _> = serde_json::from_str(json);
+        assert!(parsed.is_ok(), "serde_json should accept whitespace-wrapped JSON");
+        assert_eq!(parsed.unwrap(), Obj { key: "value".into() });
+    }
 }