diff --git a/src/mito2/src/engine/tests.rs b/src/mito2/src/engine/tests.rs
index 18b8d076ef02..5bd934abbcdd 100644
--- a/src/mito2/src/engine/tests.rs
+++ b/src/mito2/src/engine/tests.rs
@@ -22,7 +22,7 @@ use crate::test_util::{CreateRequestBuilder, TestEnv};
 
 #[tokio::test]
 async fn test_engine_new_stop() {
-    let env = TestEnv::new("engine-stop");
+    let env = TestEnv::with_prefix("engine-stop");
     let engine = env.create_engine(MitoConfig::default()).await;
 
     engine.stop().await.unwrap();
@@ -37,7 +37,7 @@ async fn test_engine_new_stop() {
 
 #[tokio::test]
 async fn test_engine_create_new_region() {
-    let env = TestEnv::new("new-region");
+    let env = TestEnv::with_prefix("new-region");
     let engine = env.create_engine(MitoConfig::default()).await;
 
     let region_id = RegionId::new(1, 1);
@@ -49,7 +49,7 @@ async fn test_engine_create_new_region() {
 
 #[tokio::test]
 async fn test_engine_create_region_if_not_exists() {
-    let env = TestEnv::new("create-not-exists");
+    let env = TestEnv::with_prefix("create-not-exists");
     let engine = env.create_engine(MitoConfig::default()).await;
 
     let builder = CreateRequestBuilder::new(RegionId::new(1, 1)).create_if_not_exists(true);
@@ -61,7 +61,7 @@ async fn test_engine_create_region_if_not_exists() {
 
 #[tokio::test]
 async fn test_engine_create_existing_region() {
-    let env = TestEnv::new("create-existing");
+    let env = TestEnv::with_prefix("create-existing");
     let engine = env.create_engine(MitoConfig::default()).await;
 
     let builder = CreateRequestBuilder::new(RegionId::new(1, 1));
@@ -74,8 +74,3 @@ async fn test_engine_create_existing_region() {
         "unexpected err: {err}"
     );
 }
-
-#[tokio::test]
-async fn test_engine_open_empty() {
-    let env = TestEnv::new("open-empty");
-}
diff --git a/src/mito2/src/manifest/manager.rs b/src/mito2/src/manifest/manager.rs
index 40d90ed0f417..e7e719b20724 100644
--- a/src/mito2/src/manifest/manager.rs
+++ b/src/mito2/src/manifest/manager.rs
@@ -377,7 +377,7 @@ mod test {
     #[tokio::test]
     async fn create_manifest_manager() {
         let metadata = Arc::new(basic_region_metadata());
-        let env = TestEnv::new("");
+        let env = TestEnv::new();
         let manager = env
             .create_manifest_manager(CompressionType::Uncompressed, 10, Some(metadata.clone()))
             .await
@@ -389,7 +389,7 @@ mod test {
 
     #[tokio::test]
     async fn open_manifest_manager() {
-        let env = TestEnv::new("");
+        let env = TestEnv::new();
         // Try to opens an empty manifest.
         assert!(env
             .create_manifest_manager(CompressionType::Uncompressed, 10, None)
@@ -420,7 +420,7 @@ mod test {
     #[tokio::test]
     async fn region_change_add_column() {
         let metadata = Arc::new(basic_region_metadata());
-        let env = TestEnv::new("");
+        let env = TestEnv::new();
         let manager = env
             .create_manifest_manager(CompressionType::Uncompressed, 10, Some(metadata.clone()))
             .await
diff --git a/src/mito2/src/test_util.rs b/src/mito2/src/test_util.rs
index 71244f6a1945..e6f6247fa375 100644
--- a/src/mito2/src/test_util.rs
+++ b/src/mito2/src/test_util.rs
@@ -43,8 +43,15 @@ pub struct TestEnv {
 }
 
 impl TestEnv {
+    /// Returns a new env with empty prefix for test.
+    pub fn new() -> TestEnv {
+        TestEnv {
+            data_home: create_temp_dir(""),
+        }
+    }
+
     /// Returns a new env with specific `prefix` for test.
-    pub fn new(prefix: &str) -> TestEnv {
+    pub fn with_prefix(prefix: &str) -> TestEnv {
         TestEnv {
             data_home: create_temp_dir(prefix),
         }
diff --git a/src/mito2/src/worker.rs b/src/mito2/src/worker.rs
index a2fd326f7dba..200f1131bd66 100644
--- a/src/mito2/src/worker.rs
+++ b/src/mito2/src/worker.rs
@@ -400,7 +400,7 @@ mod tests {
 
     #[tokio::test]
     async fn test_worker_group_start_stop() {
-        let env = TestEnv::new("group-stop");
+        let env = TestEnv::with_prefix("group-stop");
         let group = env
             .create_worker_group(MitoConfig {
                 num_workers: 4,