diff --git a/src/cli.rs b/src/cli.rs
index 99b622a..4115b29 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -1,5 +1,5 @@
-use clap::{ArgGroup, Parser, Subcommand};
 use super::commands as cmd;
+use clap::{ArgGroup, Parser, Subcommand};
 /// Rust实现的简易版本的Git，用于学习Rust语言
 #[derive(Parser)]
 #[command(author, version, about, long_about = None)]
@@ -14,7 +14,6 @@ enum Command {
     /// 初始化仓库
     Init,
     /// 添加文件到暂存区
-    /// @see <a href="https://juejin.cn/post/7053831273277554696">git add .，git add -A，git add -u，git add * 的区别与联系</a>
     Add {
         /// 要添加的文件
         files: Vec<String>,
diff --git a/src/commands/add.rs b/src/commands/add.rs
index d3aeea6..b12fd21 100644
--- a/src/commands/add.rs
+++ b/src/commands/add.rs
@@ -8,6 +8,7 @@ use crate::models::*;
 use crate::utils::util;
 
 /// add是对index的操作，不会对工作区产生影响
+/// @see <a href="https://juejin.cn/post/7053831273277554696">git add .，git add -A，git add -u，git add * 的区别与联系</a>
 pub fn add(raw_paths: Vec<String>, all: bool, mut update: bool) {
     util::check_repo_exist();
 
diff --git a/src/commands/branch.rs b/src/commands/branch.rs
index 50f02f1..889454e 100644
--- a/src/commands/branch.rs
+++ b/src/commands/branch.rs
@@ -2,7 +2,7 @@ use colored::Colorize;
 
 use crate::{
     models::*,
-    utils::{head, store, util},
+    utils::{store, util},
 };
 
 // branch error
@@ -126,10 +126,10 @@ pub fn branch(
 #[cfg(test)]
 mod test {
     use super::*;
-    use crate::{commands, utils::test_util};
+    use crate::{commands, utils::test};
     #[test]
     fn test_create_branch() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
 
         // no commit: invalid object
         let result = create_branch("test_branch".to_string(), head::current_head_commit());
@@ -170,7 +170,7 @@ mod test {
 
     #[test]
     fn test_delete_branch() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
 
         // no commit: invalid object
         let result = delete_branch("test_branch".to_string());
diff --git a/src/commands/commit.rs b/src/commands/commit.rs
index 24b46b8..3354a0e 100644
--- a/src/commands/commit.rs
+++ b/src/commands/commit.rs
@@ -1,4 +1,4 @@
-use crate::{models::*, utils::head};
+use crate::models::*;
 
 use super::status;
 
@@ -38,33 +38,30 @@ pub fn commit(message: String, allow_empty: bool) {
 mod test {
     use std::path::Path;
 
-    use crate::{
-        commands as cmd, models,
-        utils::{head, test_util},
-    };
+    use crate::{commands as cmd, models::*, utils::test};
 
     #[test]
     #[should_panic]
     fn test_commit_empty() {
-        test_util::setup_test_with_empty_workdir();
+        test::setup_with_empty_workdir();
         super::commit("".to_string(), false);
     }
 
     #[test]
     fn test_commit() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let test_file = "a.txt";
         let head_one = head::current_head_commit();
         assert!(head_one.is_empty());
 
-        test_util::ensure_test_file(&Path::new(test_file), "test content".into());
+        test::ensure_file(&Path::new(test_file), "test content".into());
         cmd::add(vec![], true, false);
         cmd::commit("test commit 1".to_string(), true);
         let head_two = head::current_head_commit();
         assert!(head_two.len() > 0);
 
-        let commit = models::commit::Commit::load(&head_two);
-        assert!(commit.get_parent_hash().len() == 0);
-        assert!(commit.get_message() == "test commit 1");
+        let commit = Commit::load(&head_two);
+        assert_eq!(commit.get_parent_hash().len(), 0);
+        assert_eq!(commit.get_message(), "test commit 1");
     }
 }
diff --git a/src/commands/log.rs b/src/commands/log.rs
index e2ea6b6..f60a43c 100644
--- a/src/commands/log.rs
+++ b/src/commands/log.rs
@@ -1,4 +1,4 @@
-use crate::{models::Commit, utils::head};
+use crate::models::{head, Commit};
 use colored::Colorize;
 
 const DEFAULT_LOG_NUMBER: usize = 10;
@@ -70,10 +70,10 @@ fn __log(all: bool, number: Option<usize>) -> usize {
 #[cfg(test)]
 mod test {
     use super::super::super::commands;
-    use crate::utils::test_util;
+    use crate::utils::test;
     #[test]
     fn test_log() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         assert_eq!(super::__log(false, None), 0);
         commands::commit::commit("test commit 2".into(), true);
         assert_eq!(super::__log(false, Some(1)), 1);
diff --git a/src/commands/merge.rs b/src/commands/merge.rs
index 3c7cf01..0b338c0 100644
--- a/src/commands/merge.rs
+++ b/src/commands/merge.rs
@@ -1,7 +1,7 @@
 use crate::{
     commands::{self, status::*},
-    models::{Commit, Hash},
-    utils::{head, store, util},
+    models::{head, Commit, Hash},
+    utils::{store, util},
 };
 
 enum MergeErr {
@@ -83,12 +83,12 @@ mod test {
     use super::*;
     use crate::{
         commands::{commit, switch::switch},
-        utils::test_util,
+        utils::test,
     };
 
     #[test]
     fn test_check_ff() {
-        test_util::setup_test_with_empty_workdir();
+        test::setup_with_empty_workdir();
         commit::commit("init".to_string(), true);
         let commit1 = head::current_head_commit();
         let origin_branch = match head::current_head() {
diff --git a/src/commands/restore.rs b/src/commands/restore.rs
index 14cb5dd..5c98e5b 100644
--- a/src/commands/restore.rs
+++ b/src/commands/restore.rs
@@ -6,7 +6,7 @@ use std::{
 
 use crate::{
     models::*,
-    utils::{head, store, util},
+    utils::{store, util},
 };
 
 /// 统计[工作区]中相对于target_blobs已删除的文件（根据filters进行过滤）
@@ -216,14 +216,14 @@ pub fn restore(paths: Vec<String>, source: Option<String>, worktree: bool, stage
 mod test {
     use std::fs;
     //TODO 写测试！
-    use crate::{commands as cmd, commands::status, models::Index, utils::test_util};
+    use crate::{commands as cmd, commands::status, models::Index, utils::test};
     use std::path::PathBuf;
 
     #[test]
     fn test_restore_stage() {
-        test_util::setup_test_with_empty_workdir();
+        test::setup_with_empty_workdir();
         let path = PathBuf::from("a.txt");
-        test_util::ensure_no_file(&path);
+        test::ensure_no_file(&path);
         cmd::add(vec![], true, false); //add -A
         cmd::restore(vec![".".to_string()], Some("HEAD".to_string()), false, true);
         let index = Index::get_instance();
@@ -232,9 +232,9 @@ mod test {
 
     #[test]
     fn test_restore_worktree() {
-        test_util::setup_test_with_empty_workdir();
+        test::setup_with_empty_workdir();
         let files = vec!["a.txt", "b.txt", "c.txt", "test/in.txt"];
-        test_util::ensure_test_files(&files);
+        test::ensure_files(&files);
 
         cmd::add(vec![], true, false);
         assert_eq!(status::changes_to_be_committed().new.iter().count(), 4);
diff --git a/src/commands/status.rs b/src/commands/status.rs
index 21a73ee..9dc844d 100644
--- a/src/commands/status.rs
+++ b/src/commands/status.rs
@@ -1,6 +1,5 @@
 use crate::{
-    utils::head,
-    models::{Commit, Index},
+    models::{head, Commit, Index},
     utils::util,
 };
 use colored::Colorize;
@@ -196,14 +195,14 @@ pub fn status() {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::{commands as cmd, utils::test_util};
+    use crate::{commands as cmd, utils::test};
     use std::path::Path;
 
     #[test]
     fn test_changes_to_be_committed() {
-        test_util::setup_test_with_empty_workdir();
+        test::setup_with_empty_workdir();
         let test_file = "a.txt";
-        test_util::ensure_test_file(Path::new(test_file), None);
+        test::ensure_file(Path::new(test_file), None);
 
         cmd::commit("test commit".to_string(), true);
         cmd::add(vec![test_file.to_string()], false, false);
@@ -215,7 +214,7 @@ mod tests {
         println!("{:?}", change.to_absolute());
 
         cmd::commit("test commit".to_string(), true);
-        test_util::ensure_test_file(Path::new(test_file), Some("new content"));
+        test::ensure_file(Path::new(test_file), Some("new content"));
         cmd::add(vec![test_file.to_string()], false, false);
         let change = changes_to_be_committed();
         assert_eq!(change.new.len(), 0);
diff --git a/src/commands/switch.rs b/src/commands/switch.rs
index 90053a1..d46ad93 100644
--- a/src/commands/switch.rs
+++ b/src/commands/switch.rs
@@ -1,8 +1,8 @@
 use colored::Colorize;
 
 use crate::{
-    models::{Commit, Hash},
-    utils::{head, store, util},
+    models::{head, Commit, Hash},
+    utils::{store, util},
 };
 
 use super::{
@@ -88,12 +88,12 @@ mod test {
     use super::*;
     use crate::{
         commands::{self as cmd},
-        utils::test_util,
+        utils::test,
     };
     use std::path::PathBuf;
     #[test]
     fn test_switch() {
-        test_util::setup_test_with_empty_workdir();
+        test::setup_with_empty_workdir();
 
         cmd::commit("init".to_string(), true);
         let test_branch_1 = "test_branch_1".to_string();
@@ -101,7 +101,7 @@ mod test {
 
         /* test 1: NoClean */
         let test_file_1 = PathBuf::from("test_file_1");
-        test_util::ensure_test_file(&test_file_1, None);
+        test::ensure_file(&test_file_1, None);
         let result = switch_to(test_branch_1.clone(), false);
         assert!(result.is_err());
         assert!(matches!(result.unwrap_err(), SwitchErr::NoClean));
@@ -122,12 +122,12 @@ mod test {
         assert!(matches!(result.unwrap_err(), SwitchErr::InvalidObject));
 
         let tees_file_2 = PathBuf::from("test_file_2");
-        test_util::ensure_test_file(&tees_file_2, None);
+        test::ensure_file(&tees_file_2, None);
         cmd::add(vec![], true, false); // add all
         cmd::commit("add file 2".to_string(), false);
         let history_commit = head::current_head_commit(); // commit: test_file_1 exists, test_file_2 exists
 
-        test_util::ensure_no_file(&test_file_1);
+        test::ensure_no_file(&test_file_1);
         cmd::add(vec![], true, false); // add all
         assert!(!test_file_1.exists());
         cmd::commit("delete file 1".to_string(), false);
diff --git a/src/models/commit.rs b/src/models/commit.rs
index 23442f2..5710f80 100644
--- a/src/models/commit.rs
+++ b/src/models/commit.rs
@@ -82,11 +82,11 @@ impl Commit {
 
 #[cfg(test)]
 mod test {
-    use crate::utils::test_util;
+    use crate::utils::test;
 
     #[test]
     fn test_commit() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
 
         let index = super::Index::get_instance();
         let mut commit = super::Commit::new(&index, vec!["123".to_string(), "456".to_string()], "test".to_string());
diff --git a/src/utils/head.rs b/src/models/head.rs
similarity index 93%
rename from src/utils/head.rs
rename to src/models/head.rs
index 984a65d..ad530ee 100644
--- a/src/utils/head.rs
+++ b/src/models/head.rs
@@ -113,12 +113,12 @@ pub fn change_head_to_commit(commit_hash: &String) {
 
 #[cfg(test)]
 mod test {
-    use crate::utils::test_util;
-    use crate::utils::head;
+    use crate::models::head;
+    use crate::utils::test;
 
     #[test]
     fn test_edit_branch() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let branch_name = "test_branch".to_string() + &rand::random::<u32>().to_string();
         let branch_head = super::get_branch_head(&branch_name);
         assert!(branch_head.is_empty());
@@ -127,12 +127,12 @@ mod test {
         super::update_branch(&branch_name, &commit_hash);
         let branch_head = super::get_branch_head(&branch_name);
         assert!(!branch_head.is_empty());
-        assert!(branch_head == commit_hash);
+        assert_eq!(branch_head, commit_hash);
     }
 
     #[test]
     fn test_list_local_branches() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let branch_one = "test_branch".to_string() + &rand::random::<u32>().to_string();
         let branch_two = "test_branch".to_string() + &rand::random::<u32>().to_string();
         head::update_branch(&branch_one, &"1234567890".to_string());
@@ -145,7 +145,7 @@ mod test {
 
     #[test]
     fn test_change_head_to_branch() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let branch_name = "test_branch".to_string() + &rand::random::<u32>().to_string();
         head::update_branch(&branch_name, &"1234567890".to_string());
         super::change_head_to_branch(&branch_name);
@@ -160,7 +160,7 @@ mod test {
 
     #[test]
     fn test_change_head_to_commit() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let commit_hash = "1234567890".to_string();
         super::change_head_to_commit(&commit_hash);
         assert!(
@@ -174,12 +174,12 @@ mod test {
 
     #[test]
     fn test_update_branch_head() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let branch_name = "test_branch".to_string() + &rand::random::<u32>().to_string();
         let commit_hash = "1234567890".to_string();
         super::update_branch(&branch_name, &commit_hash);
         let branch_head = super::get_branch_head(&branch_name);
         assert!(!branch_head.is_empty());
-        assert!(branch_head == commit_hash);
+        assert_eq!(branch_head, commit_hash);
     }
 }
diff --git a/src/models/index.rs b/src/models/index.rs
index b6afb98..964b7d3 100644
--- a/src/models/index.rs
+++ b/src/models/index.rs
@@ -209,12 +209,12 @@ impl Index {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::utils::test_util;
+    use crate::utils::test;
     use std::fs;
 
     #[test]
     fn test_meta_get() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let metadata = fs::metadata(".mit/HEAD").unwrap();
         println!("{:?}", util::format_time(&metadata.created().unwrap()));
         println!("{:?}", util::format_time(&metadata.modified().unwrap()));
@@ -223,20 +223,20 @@ mod tests {
 
     #[test]
     fn test_load() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let index = Index::get_instance();
         println!("{:?}", index);
     }
 
     #[test]
     fn test_save() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let index = Index::get_instance();
         let path = PathBuf::from("../mit_test_storage/.mit/HEAD"); //测试../相对路径的处理
         index.add(path.clone(), FileMetaData::new(&Blob::new(&path), &path));
 
         let 中文路径 = "中文路径.txt";
-        test_util::ensure_test_file(Path::new(中文路径), None);
+        test::ensure_file(Path::new(中文路径), None);
         let path = PathBuf::from(中文路径);
         index.add(path.clone(), FileMetaData::new(&Blob::new(&path), &path));
         index.save();
@@ -245,7 +245,7 @@ mod tests {
 
     #[test]
     fn test_save_load() {
-        test_util::setup_test_with_empty_workdir();
+        test::setup_with_empty_workdir();
         let index = Index::get_instance();
         let path = PathBuf::from(".mit/HEAD");
         index.add(path.clone(), FileMetaData::new(&Blob::new(&path), &path));
diff --git a/src/models/mod.rs b/src/models/mod.rs
index 7245fad..0faaeed 100644
--- a/src/models/mod.rs
+++ b/src/models/mod.rs
@@ -7,5 +7,7 @@ pub use index::FileMetaData;
 pub use index::Index;
 pub mod object;
 pub use object::Hash;
+pub mod head;
 pub mod tree;
+
 pub use tree::Tree;
diff --git a/src/models/tree.rs b/src/models/tree.rs
index c8d7721..76dabb1 100644
--- a/src/models/tree.rs
+++ b/src/models/tree.rs
@@ -159,16 +159,16 @@ mod test {
 
     use crate::{
         models::*,
-        utils::{util, test_util},
+        utils::{test, util},
     };
 
     #[test]
     fn test_new() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let index = Index::get_instance();
         for test_file in vec!["b.txt", "mit_src/a.txt", "test/test.txt"] {
             let test_file = PathBuf::from(test_file);
-            test_util::ensure_test_file(&test_file, None);
+            test::ensure_file(&test_file, None);
             index.add(test_file.clone(), FileMetaData::new(&Blob::new(&test_file), &test_file));
             index.add(test_file.clone(), FileMetaData::new(&Blob::new(&test_file), &test_file));
         }
@@ -180,12 +180,12 @@ mod test {
 
     #[test]
     fn test_load() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let index = Index::get_instance();
         let test_files = vec!["b.txt", "mit_src/a.txt"];
         for test_file in test_files.clone() {
             let test_file = PathBuf::from(test_file);
-            test_util::ensure_test_file(&test_file, None);
+            test::ensure_file(&test_file, None);
             index.add(test_file.clone(), FileMetaData::new(&Blob::new(&test_file), &test_file));
         }
 
@@ -200,11 +200,11 @@ mod test {
 
     #[test]
     fn test_get_recursive_file_entries() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let index = Index::get_instance();
         let mut test_files = vec![PathBuf::from("b.txt"), PathBuf::from("mit_src/a.txt")];
         for test_file in test_files.clone() {
-            test_util::ensure_test_file(&test_file, None);
+            test::ensure_file(&test_file, None);
             index.add(test_file.clone(), FileMetaData::new(&Blob::new(&test_file), &test_file));
         }
 
@@ -228,13 +228,13 @@ mod test {
 
     #[test]
     fn test_get_recursive_blobs() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let index = Index::get_instance();
         let test_files = vec!["b.txt", "mit_src/a.txt"];
         let mut test_blobs = vec![];
         for test_file in test_files.clone() {
             let test_file = PathBuf::from(test_file);
-            test_util::ensure_test_file(&test_file, None);
+            test::ensure_file(&test_file, None);
             let blob = Blob::new(&test_file);
             test_blobs.push(blob.clone());
             index.add(test_file.clone(), FileMetaData::new(&Blob::new(&test_file), &test_file));
diff --git a/src/utils/mod.rs b/src/utils/mod.rs
index 36e49f6..381e0a1 100644
--- a/src/utils/mod.rs
+++ b/src/utils/mod.rs
@@ -1,4 +1,3 @@
-pub mod util;
-pub mod head;
 pub mod store;
-pub mod test_util;
\ No newline at end of file
+pub mod test;
+pub mod util;
diff --git a/src/utils/store.rs b/src/utils/store.rs
index f0441da..5299172 100644
--- a/src/utils/store.rs
+++ b/src/utils/store.rs
@@ -87,24 +87,24 @@ mod tests {
     use std::fs;
 
     use super::*;
-    use crate::utils::test_util;
+    use crate::utils::test;
 
     #[test]
     fn test_new_success() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let _ = Store::new();
     }
 
     #[test]
     #[should_panic]
     fn test_new_fail() {
-        test_util::setup_test_without_mit();
+        test::setup_without_mit();
         let _ = Store::new();
     }
 
     #[test]
     fn test_save_and_load() {
-        let _ = test_util::setup_test_with_clean_mit();
+        let _ = test::setup_with_clean_mit();
         let store = Store::new();
         let content = "hello world".to_string();
         let hash = store.save(&content);
@@ -114,7 +114,7 @@ mod tests {
 
     #[test]
     fn test_search() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let hashs = vec!["1234567890".to_string(), "1235467891".to_string(), "4567892".to_string()];
         for hash in hashs.iter() {
             let mut path = util::get_storage_path().unwrap();
diff --git a/src/utils/test_util.rs b/src/utils/test.rs
similarity index 85%
rename from src/utils/test_util.rs
rename to src/utils/test.rs
index 27d849b..039b0d8 100644
--- a/src/utils/test_util.rs
+++ b/src/utils/test.rs
@@ -1,17 +1,15 @@
 #![cfg(test)]
-
-pub const TEST_DIR: &str = "mit_test_storage";
+/** tools for test */
+use crate::models::Index;
 use std::{
     fs,
     io::{self, Write},
     path::{Path, PathBuf},
 };
 
-use crate::models::Index;
-
-// 执行测试的储存库
 use super::util;
-/* tools for test */
+
+pub const TEST_DIR: &str = "mit_test_storage";
 fn find_cargo_dir() -> PathBuf {
     let cargo_path = std::env::var("CARGO_MANIFEST_DIR");
     if cargo_path.is_err() {
@@ -34,7 +32,7 @@ fn find_cargo_dir() -> PathBuf {
 }
 
 /// 准备测试环境，切换到测试目录
-fn setup_test_env() {
+fn setup_env() {
     color_backtrace::install(); // colorize backtrace
 
     let mut path = find_cargo_dir();
@@ -51,14 +49,14 @@ pub fn init_mit() {
 }
 
 /// with 初始化的干净的mit
-pub fn setup_test_with_clean_mit() {
-    setup_test_without_mit();
+pub fn setup_with_clean_mit() {
+    setup_without_mit();
     init_mit();
 }
 
-pub fn setup_test_without_mit() {
+pub fn setup_without_mit() {
     // 将执行目录切换到测试目录，并清除测试目录下的.mit目录
-    setup_test_env();
+    setup_env();
     let mut path = util::cur_dir();
     path.push(util::ROOT_DIR);
     if path.exists() {
@@ -66,9 +64,9 @@ pub fn setup_test_without_mit() {
     }
 }
 
-pub fn ensure_test_files<T: AsRef<str>>(paths: &Vec<T>) {
+pub fn ensure_files<T: AsRef<str>>(paths: &Vec<T>) {
     for path in paths {
-        ensure_test_file(path.as_ref().as_ref(), None);
+        ensure_file(path.as_ref().as_ref(), None);
     }
 }
 
@@ -85,13 +83,13 @@ pub fn ensure_empty_dir<P: AsRef<Path>>(path: P) -> io::Result<()> {
     Ok(())
 }
 
-pub fn setup_test_with_empty_workdir() {
+pub fn setup_with_empty_workdir() {
     let test_dir = find_cargo_dir().join(TEST_DIR);
     ensure_empty_dir(&test_dir).unwrap();
-    setup_test_with_clean_mit();
+    setup_with_clean_mit();
 }
 
-pub fn ensure_test_file(path: &Path, content: Option<&str>) {
+pub fn ensure_file(path: &Path, content: Option<&str>) {
     // 以测试目录为根目录，创建文件
     fs::create_dir_all(path.parent().unwrap()).unwrap(); // ensure父目录
     let mut file = fs::File::create(util::get_working_dir().unwrap().join(path))
diff --git a/src/utils/util.rs b/src/utils/util.rs
index 1520b7d..eb2618e 100644
--- a/src/utils/util.rs
+++ b/src/utils/util.rs
@@ -431,7 +431,7 @@ pub fn is_typeof_commit(hash: Hash) -> bool {
 mod tests {
     use crate::{
         models::{blob::Blob, index::Index},
-        utils::{test_util, util::*},
+        utils::{test, util::*},
     };
 
     #[test]
@@ -474,7 +474,7 @@ mod tests {
 
     #[test]
     fn test_get_relative_path() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let path = Path::new("../../src\\main.rs");
         let rel_path = get_relative_path(&path, &cur_dir());
         println!("{:?}", rel_path);
@@ -484,7 +484,7 @@ mod tests {
 
     #[test]
     fn test_to_workdir_absolute_path() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let path = Path::new("./src/../main.rs");
         let abs_path = to_workdir_absolute_path(path);
         println!("{:?}", abs_path);
@@ -496,7 +496,7 @@ mod tests {
 
     #[test]
     fn test_is_inside_repo() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         let path = Path::new("../Cargo.toml");
         assert_eq!(is_inside_workdir(path), false);
 
@@ -514,10 +514,10 @@ mod tests {
 
     #[test]
     fn test_list_files() {
-        test_util::setup_test_with_clean_mit();
-        test_util::ensure_test_file(Path::new("test/test.txt"), None);
-        test_util::ensure_test_file(Path::new("a.txt"), None);
-        test_util::ensure_test_file(Path::new("b.txt"), None);
+        test::setup_with_clean_mit();
+        test::ensure_file(Path::new("test/test.txt"), None);
+        test::ensure_file(Path::new("a.txt"), None);
+        test::ensure_file(Path::new("b.txt"), None);
         let files = list_files(Path::new("./"));
         match files {
             Ok(files) => {
@@ -533,9 +533,9 @@ mod tests {
 
     #[test]
     fn test_check_object_type() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         assert_eq!(check_object_type("123".into()), ObjectType::Invalid);
-        test_util::ensure_test_file(Path::new("test.txt"), Some("test"));
+        test::ensure_file(Path::new("test.txt"), Some("test"));
         let hash = Blob::new(get_working_dir().unwrap().join("test.txt").as_path()).get_hash();
         assert_eq!(check_object_type(hash), ObjectType::Blob);
         let mut commit = Commit::new(&Index::get_instance(), vec![], "test".to_string());
@@ -546,7 +546,7 @@ mod tests {
 
     #[test]
     fn test_check_root_dir() {
-        test_util::setup_test_with_clean_mit();
+        test::setup_with_clean_mit();
         list_workdir_files().iter().for_each(|f| {
             fs::remove_file(f).unwrap();
         });