diff --git a/kernel/src/engine/default/json.rs b/kernel/src/engine/default/json.rs
index 4ab429c9c..65c4863d2 100644
--- a/kernel/src/engine/default/json.rs
+++ b/kernel/src/engine/default/json.rs
@@ -217,12 +217,21 @@ impl JsonOpener {
 
 #[cfg(test)]
 mod tests {
+    use std::collections::HashMap;
     use std::path::PathBuf;
+    use std::sync::Arc;
+    use std::sync::Mutex;
+    use std::time::Duration;
 
     use crate::arrow::array::{AsArray, RecordBatch, StringArray};
     use crate::arrow::datatypes::{DataType, Field, Schema as ArrowSchema};
+    use futures::future;
     use itertools::Itertools;
     use object_store::{local::LocalFileSystem, ObjectStore};
+    use object_store::{
+        GetOptions, GetResult, ListResult, MultipartUpload, ObjectMeta, PutMultipartOpts,
+        PutOptions, PutPayload, PutResult, Result,
+    };
 
     use super::*;
     use crate::{
@@ -230,16 +239,6 @@ mod tests {
         engine::default::executor::tokio::TokioBackgroundExecutor,
     };
 
-    use std::collections::HashMap;
-    use std::sync::Arc;
-    use std::sync::Mutex;
-    use std::time::Duration;
-
-    use object_store::{
-        GetOptions, GetResult, ListResult, MultipartUpload, ObjectMeta, PutMultipartOpts,
-        PutOptions, PutPayload, PutResult, Result,
-    };
-
     /// Store wrapper that wraps an inner store to purposefully delay GET requests of certain keys.
     #[derive(Debug)]
     struct SlowGetStore<T> {
@@ -455,9 +454,9 @@ mod tests {
         ];
         let paths = paths.map(|p| std::fs::canonicalize(PathBuf::from(p)).unwrap());
 
-        // Convert &std::path::Path to object_store::path::Path
         let path_string = paths[0].to_string_lossy().to_string();
         let object_store_path = Path::from(path_string);
+        // for the first 000000.json, wait for 1 second
         let key_map = (object_store_path, Duration::from_secs(1));
 
         let store = Arc::new(SlowGetStore::new(
@@ -465,9 +464,6 @@ mod tests {
             vec![key_map].into_iter().collect(),
         ));
 
-        // Create a vector of futures, then await them all
-        use futures::future;
-
         let file_futures: Vec<_> = paths
             .iter()
             .map(|path| {
@@ -484,11 +480,8 @@ mod tests {
                 }
             })
             .collect();
-
-        // Await all futures to get a Vec<FileMeta>
         let files = future::join_all(file_futures).await;
 
-        // Same as before, but now files is a Vec<FileMeta>
         let handler = DefaultJsonHandler::new(store, Arc::new(TokioBackgroundExecutor::new()));
         let physical_schema = Arc::new(ArrowSchema::try_from(get_log_schema().as_ref()).unwrap());
         let data: Vec<RecordBatch> = handler