test: checkpoint struct fields gets serialized to camelCase

crates/core/src/table/mod.rs

@@ -627,4 +627,21 @@ mod tests {
             .unwrap();
         (dt, tmp_dir)
     }
+
+    #[test]
+    fn checkpoint_should_serialize_in_camel_case() {
+        let checkpoint = CheckPoint {
+            version: 1,
+            size: 1,
+            parts: None,
+            size_in_bytes: Some(1),
+            num_of_add_files: Some(1),
+        };
+
+        let checkpoint_json_serialized =
+            serde_json::to_string(&checkpoint).expect("could not serialize to json");
+
+        assert!(checkpoint_json_serialized.contains("sizeInBytes"));
+        assert!(checkpoint_json_serialized.contains("numOfAddFiles"));
+    }
 }