diff --git a/src/mito2/src/cache/file_cache.rs b/src/mito2/src/cache/file_cache.rs
index a38ee33d97da..4519c3e0734e 100644
--- a/src/mito2/src/cache/file_cache.rs
+++ b/src/mito2/src/cache/file_cache.rs
@@ -90,6 +90,10 @@ impl FileCache {
         }
     }
 
+    pub(crate) fn contains_key(&self, key: &IndexKey) -> bool {
+        self.memory_index.contains_key(key)
+    }
+
     /// Puts a file into the cache index.
     ///
     /// The `WriteCache` should ensure the file is in the correct path.
diff --git a/src/mito2/src/cache/test_util.rs b/src/mito2/src/cache/test_util.rs
index deb4ba23cd7b..306bb50467e8 100644
--- a/src/mito2/src/cache/test_util.rs
+++ b/src/mito2/src/cache/test_util.rs
@@ -19,6 +19,8 @@ use std::sync::Arc;
 use bytes::Bytes;
 use datatypes::arrow::array::{ArrayRef, Int64Array};
 use datatypes::arrow::record_batch::RecordBatch;
+use object_store::services::Fs;
+use object_store::ObjectStore;
 use parquet::arrow::arrow_reader::ParquetRecordBatchReaderBuilder;
 use parquet::arrow::ArrowWriter;
 use parquet::file::metadata::ParquetMetaData;
@@ -42,3 +44,9 @@ fn parquet_file_data() -> Vec<u8> {
 
     buffer
 }
+
+pub(crate) fn new_fs_store(path: &str) -> ObjectStore {
+    let mut builder = Fs::default();
+    builder.root(path);
+    ObjectStore::new(builder).unwrap().finish()
+}
diff --git a/src/mito2/src/cache/write_cache.rs b/src/mito2/src/cache/write_cache.rs
index dcc13ef2aa31..d769057b4ecf 100644
--- a/src/mito2/src/cache/write_cache.rs
+++ b/src/mito2/src/cache/write_cache.rs
@@ -30,7 +30,8 @@ use crate::metrics::{UPLOAD_BYTES_TOTAL, WRITE_AND_UPLOAD_ELAPSED_TOTAL};
 use crate::read::Source;
 use crate::sst::file::FileId;
 use crate::sst::parquet::writer::ParquetWriter;
-use crate::sst::parquet::{SstInfo, WriteOptions, DEFAULT_WRITE_BUFFER_SIZE};
+use crate::sst::parquet::{SstInfo, WriteOptions};
+use crate::sst::DEFAULT_WRITE_BUFFER_SIZE;
 
 /// A cache for uploading files to remote object stores.
 ///
@@ -137,3 +138,94 @@ pub struct SstUploadRequest {
     /// Remote object store to upload.
     pub remote_store: ObjectStore,
 }
+
+#[cfg(test)]
+mod tests {
+    use api::v1::OpType;
+    use common_base::readable_size::ReadableSize;
+    use common_test_util::temp_dir::create_temp_dir;
+    use object_store::manager::ObjectStoreManager;
+    use object_store::services::Fs;
+    use object_store::ObjectStore;
+    use store_api::storage::RegionId;
+
+    use super::*;
+    use crate::cache::file_cache::{self, FileCache};
+    use crate::cache::test_util::new_fs_store;
+    use crate::sst::file::FileId;
+    use crate::sst::location::sst_file_path;
+    use crate::test_util::sst_util::{
+        new_batch_by_range, new_source, sst_file_handle, sst_region_metadata,
+    };
+    use crate::test_util::{build_rows, new_batch_builder, CreateRequestBuilder, TestEnv};
+
+    #[tokio::test]
+    async fn test_write_and_upload_sst() {
+        // Create a local object store and FileCache.
+        let local_dir = create_temp_dir("");
+        let local_store = new_fs_store(local_dir.path().to_str().unwrap());
+        let cache = FileCache::new(local_store.clone(), ReadableSize::mb(10));
+        let file_id = FileId::random();
+
+        // Create Source
+        let metadata = Arc::new(sst_region_metadata());
+        let region_id = metadata.region_id;
+        let source = new_source(&[
+            new_batch_by_range(&["a", "d"], 0, 60),
+            new_batch_by_range(&["b", "f"], 0, 40),
+            new_batch_by_range(&["b", "h"], 100, 200),
+        ]);
+
+        // TODO(QuenKar): maybe find a way to create some object server for testing,
+        // and now just use local file system to mock.
+        let mut env = TestEnv::new();
+        let mock_store = env.init_object_store_manager();
+        let upload_path = sst_file_path("test", file_id);
+
+        // Create WriteCache
+        let object_store_manager = Arc::new(ObjectStoreManager::new("mock", mock_store.clone()));
+        let write_cache = WriteCache::new(
+            local_store.clone(),
+            object_store_manager,
+            ReadableSize::mb(10),
+        );
+
+        let request = SstUploadRequest {
+            file_id,
+            metadata,
+            source,
+            storage: Some("mock".to_string()),
+            upload_path: upload_path.clone(),
+            remote_store: mock_store.clone(),
+        };
+
+        let write_opts = WriteOptions {
+            row_group_size: 512,
+            ..Default::default()
+        };
+
+        // Write to cache and upload sst to mock remote store
+        let sst_info = write_cache
+            .write_and_upload_sst(request, &write_opts)
+            .await
+            .unwrap()
+            .unwrap();
+
+        // Check write cache contains the key
+        let key = (region_id, file_id);
+        assert!(write_cache.file_cache.contains_key(&key));
+
+        // Check file data
+        let remote_data = mock_store.read(&upload_path).await.unwrap();
+        let cache_data = local_store.read(&cache.cache_file_path(key)).await.unwrap();
+        assert_eq!(remote_data.len(), 3434);
+        assert_eq!(remote_data, cache_data);
+
+        // Delete test files
+        mock_store
+            .delete(&upload_path)
+            .await
+            .expect("delete must succeed");
+        write_cache.file_cache.remove(key);
+    }
+}
diff --git a/src/mito2/src/sst.rs b/src/mito2/src/sst.rs
index 94e0cb205bc2..384734465ce3 100644
--- a/src/mito2/src/sst.rs
+++ b/src/mito2/src/sst.rs
@@ -14,9 +14,14 @@
 
 //! Sorted strings tables.
 
+use common_base::readable_size::ReadableSize;
+
 pub mod file;
 pub mod file_purger;
 pub mod index;
 pub mod location;
 pub mod parquet;
 pub(crate) mod version;
+
+/// Default write buffer size.
+pub const DEFAULT_WRITE_BUFFER_SIZE: ReadableSize = ReadableSize::mb(8);
diff --git a/src/mito2/src/sst/parquet.rs b/src/mito2/src/sst/parquet.rs
index 393299ae12ec..746be130a5b6 100644
--- a/src/mito2/src/sst/parquet.rs
+++ b/src/mito2/src/sst/parquet.rs
@@ -25,11 +25,12 @@ pub mod writer;
 use common_base::readable_size::ReadableSize;
 use parquet::file::metadata::ParquetMetaData;
 
+use super::DEFAULT_WRITE_BUFFER_SIZE;
 use crate::sst::file::FileTimeRange;
 
 /// Key of metadata in parquet SST.
 pub const PARQUET_METADATA_KEY: &str = "greptime:metadata";
-pub const DEFAULT_WRITE_BUFFER_SIZE: ReadableSize = ReadableSize::mb(8);
+
 /// Default batch size to read parquet files.
 pub(crate) const DEFAULT_READ_BATCH_SIZE: usize = 1024;
 /// Default row group size for parquet files.
@@ -69,33 +70,19 @@ pub struct SstInfo {
 mod tests {
     use std::sync::Arc;
 
-    use api::v1::OpType;
     use common_time::Timestamp;
 
     use super::*;
     use crate::cache::{CacheManager, PageKey};
-    use crate::read::Batch;
     use crate::sst::parquet::reader::ParquetReaderBuilder;
     use crate::sst::parquet::writer::ParquetWriter;
     use crate::test_util::sst_util::{
-        new_primary_key, new_source, sst_file_handle, sst_region_metadata,
+        new_batch_by_range, new_source, sst_file_handle, sst_region_metadata,
     };
-    use crate::test_util::{check_reader_result, new_batch_builder, TestEnv};
+    use crate::test_util::{check_reader_result, TestEnv};
 
     const FILE_DIR: &str = "/";
 
-    fn new_batch_by_range(tags: &[&str], start: usize, end: usize) -> Batch {
-        assert!(end > start);
-        let pk = new_primary_key(tags);
-        let timestamps: Vec<_> = (start..end).map(|v| v as i64).collect();
-        let sequences = vec![1000; end - start];
-        let op_types = vec![OpType::Put; end - start];
-        let field: Vec<_> = (start..end).map(|v| v as u64).collect();
-        new_batch_builder(&pk, &timestamps, &sequences, &op_types, 2, &field)
-            .build()
-            .unwrap()
-    }
-
     #[tokio::test]
     async fn test_write_read() {
         let mut env = TestEnv::new();
diff --git a/src/mito2/src/test_util/sst_util.rs b/src/mito2/src/test_util/sst_util.rs
index 3638d119faa1..1cc158ed91b5 100644
--- a/src/mito2/src/test_util/sst_util.rs
+++ b/src/mito2/src/test_util/sst_util.rs
@@ -14,7 +14,7 @@
 
 //! Utilities for testing SSTs.
 
-use api::v1::SemanticType;
+use api::v1::{OpType, SemanticType};
 use common_time::Timestamp;
 use datatypes::prelude::ConcreteDataType;
 use datatypes::schema::ColumnSchema;
@@ -25,7 +25,7 @@ use store_api::storage::RegionId;
 use crate::read::{Batch, Source};
 use crate::row_converter::{McmpRowCodec, RowCodec, SortField};
 use crate::sst::file::{FileHandle, FileId, FileMeta};
-use crate::test_util::{new_noop_file_purger, VecBatchReader};
+use crate::test_util::{new_batch_builder, new_noop_file_purger, VecBatchReader};
 
 /// Test region id.
 const REGION_ID: RegionId = RegionId::new(0, 0);
@@ -110,3 +110,15 @@ pub fn sst_file_handle(start_ms: i64, end_ms: i64) -> FileHandle {
         file_purger,
     )
 }
+
+pub fn new_batch_by_range(tags: &[&str], start: usize, end: usize) -> Batch {
+    assert!(end > start);
+    let pk = new_primary_key(tags);
+    let timestamps: Vec<_> = (start..end).map(|v| v as i64).collect();
+    let sequences = vec![1000; end - start];
+    let op_types = vec![OpType::Put; end - start];
+    let field: Vec<_> = (start..end).map(|v| v as u64).collect();
+    new_batch_builder(&pk, &timestamps, &sequences, &op_types, 2, &field)
+        .build()
+        .unwrap()
+}