diff --git a/parquet_file/src/catalog.rs b/parquet_file/src/catalog.rs
index c013bd8d2f..5c2b731c26 100644
--- a/parquet_file/src/catalog.rs
+++ b/parquet_file/src/catalog.rs
@@ -877,27 +877,21 @@ where
     }
 }
 
-#[cfg(test)]
-mod tests {
-    use std::{cell::RefCell, num::NonZeroU32, ops::Deref};
-
-    use crate::{
-        metadata::{read_parquet_metadata_from_file, read_statistics_from_parquet_metadata},
-        storage::read_schema_from_parquet_metadata,
-        utils::{load_parquet_from_store, make_chunk, make_object_store},
-    };
-    use object_store::parsed_path;
-
+pub mod test_helpers {
     use super::*;
+    use std::{cell::RefCell, ops::Deref};
 
+    /// Part that actually holds the data of [`TestCatalogState`].
     #[derive(Clone, Debug)]
-    struct TestCatalogStateInner {
+    pub struct TestCatalogStateInner {
+        /// Map of all parquet files that are currently registered.
         pub parquet_files: HashMap<DirsAndFileName, ParquetMetaData>,
     }
 
     /// In-memory catalog state, for testing.
     #[derive(Clone, Debug)]
-    struct TestCatalogState {
+    pub struct TestCatalogState {
+        /// Inner mutable state.
         pub inner: RefCell<TestCatalogStateInner>,
     }
 
@@ -950,6 +944,21 @@ mod tests {
             Ok(())
         }
     }
+}
+
+#[cfg(test)]
+pub mod tests {
+    use std::{num::NonZeroU32, ops::Deref};
+
+    use crate::{
+        metadata::{read_parquet_metadata_from_file, read_statistics_from_parquet_metadata},
+        storage::read_schema_from_parquet_metadata,
+        utils::{load_parquet_from_store, make_chunk, make_object_store},
+    };
+    use object_store::parsed_path;
+
+    use super::test_helpers::TestCatalogState;
+    use super::*;
 
     #[tokio::test]
     async fn test_inmem_commit_semantics() {
diff --git a/server/src/db.rs b/server/src/db.rs
index 4201b33c7a..7cf3a618ef 100644
--- a/server/src/db.rs
+++ b/server/src/db.rs
@@ -1188,7 +1188,11 @@ mod tests {
     };
     use entry::test_helpers::lp_to_entry;
     use futures::{stream, StreamExt, TryStreamExt};
-    use object_store::{memory::InMemory, path::Path, ObjectStore, ObjectStoreApi};
+    use object_store::{
+        memory::InMemory,
+        path::{ObjectStorePath, Path},
+        ObjectStore, ObjectStoreApi,
+    };
     use parquet_file::{
         metadata::read_parquet_metadata_from_file,
         storage::read_schema_from_parquet_metadata,
@@ -2686,4 +2690,85 @@ mod tests {
             .gt(0.07)
             .unwrap();
     }
+
+    #[tokio::test]
+    async fn write_one_chunk_to_preserved_catalog() {
+        // Test that parquet data is commited to preserved catalog
+        let object_store = Arc::new(ObjectStore::new_in_memory(InMemory::new()));
+        let server_id = ServerId::try_from(1).unwrap();
+        let db_name = "preserved_catalog_test";
+
+        // Create a DB given a server id, an object store and a db name
+        let test_db = TestDb::builder()
+            .object_store(Arc::clone(&object_store))
+            .server_id(server_id)
+            .db_name(db_name)
+            .build();
+        let db = Arc::new(test_db.db);
+
+        // Write some line protocols in Mutable buffer of the DB
+        write_lp(db.as_ref(), "cpu bar=1 10");
+
+        //Now mark the MB chunk close
+        let partition_key = "1970-01-01T00";
+        let mb_chunk = db
+            .rollover_partition("1970-01-01T00", "cpu")
+            .await
+            .unwrap()
+            .unwrap();
+        // Move that MB chunk to RB chunk and drop it from MB
+        db.load_chunk_to_read_buffer(partition_key, "cpu", mb_chunk.id())
+            .await
+            .unwrap();
+
+        // at this point, no preserved catalog exists
+        let maybe_preserved_catalog =
+            PreservedCatalog::<parquet_file::catalog::test_helpers::TestCatalogState>::load(
+                Arc::clone(&object_store),
+                server_id,
+                db_name.to_string(),
+                (),
+            )
+            .await
+            .unwrap();
+        assert!(maybe_preserved_catalog.is_none());
+
+        // Write the RB chunk to Object Store but keep it in RB
+        db.write_chunk_to_object_store(partition_key, "cpu", mb_chunk.id())
+            .await
+            .unwrap();
+
+        // the preserved catalog should now register a single file
+        let chunk = {
+            let partition = db.catalog.state().valid_partition(&partition_key).unwrap();
+            let partition = partition.read();
+
+            partition.chunk("cpu", mb_chunk.id()).unwrap()
+        };
+        let chunk = chunk.read();
+        if let ChunkState::WrittenToObjectStore(_, chunk) = chunk.state() {
+            let path = chunk.table_path("cpu").unwrap().display();
+
+            let preserved_catalog = PreservedCatalog::<
+                parquet_file::catalog::test_helpers::TestCatalogState,
+            >::load(
+                object_store, server_id, db_name.to_string(), ()
+            )
+            .await
+            .unwrap()
+            .unwrap();
+            let mut paths: Vec<String> = preserved_catalog
+                .state()
+                .inner
+                .borrow()
+                .parquet_files
+                .keys()
+                .map(|p| p.display())
+                .collect();
+            paths.sort();
+            assert_eq!(paths, vec![path]);
+        } else {
+            panic!("Wrong chunk state.");
+        }
+    }
 }