diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index c307ec5..7cee19b 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -8,7 +8,6 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
-  XDBM_ENABLE_OVERWRITE_GITCONFIG: true
 
 jobs:
   build-and-lint:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a1a66f..77119fe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,11 +1,5 @@
 # Changelog
 
-## [Unreleased]
-
-### Fixed
-- Git local config is now looked up. (#20)
-- Git global config will not be polluted in test by default. (#20)
-
 ## [0.3.0] - 2024-12-02
 
 ### Added
diff --git a/tests/cli.rs b/tests/cli.rs
index 06e3890..5041385 100644
--- a/tests/cli.rs
+++ b/tests/cli.rs
@@ -4,58 +4,23 @@ mod integrated_test {
         io::{self, BufWriter, Write},
     };
 
-    use anyhow::{anyhow, Context, Ok, Result};
+    use anyhow::{Ok, Result};
     use assert_cmd::{assert::OutputAssertExt, Command};
     use git2::Repository;
-    use log::{debug, trace};
+    use log::trace;
     use predicates::{boolean::PredicateBooleanExt, prelude::predicate};
 
-    const IS_GIT_CONFIG_WRITABLE: &str = "XDBM_ENABLE_OVERWRITE_GITCONFIG";
-
     /// Setup global gitconfig if it doesn't exist.
     ///
     /// # Errors
     ///
-    /// This function will return an error if it failed to get git global config and environment
-    /// variable [XDBM_ENABLE_OVERWRITE_GITCONFIG](`IS_GIT_CONFIG_WRITABLE`) is not set.
-    fn setup_gitconfig() -> Result<()> {
-        let config = git2::Config::open_default().expect("failed to get default");
-        if config.get_string("user.name").is_ok() && config.get_string("user.email").is_ok() {
-            return Ok(());
-        };
-
-        match std::env::var_os(IS_GIT_CONFIG_WRITABLE) {
-            Some(_) => {
-                debug!(
-                    "global git config not found & env var `{}` found",
-                    IS_GIT_CONFIG_WRITABLE
-                );
-            }
-            None => {
-                eprintln!("Failed to get git global config");
-                eprintln!(
-                    "Set env var `{}` to set automatically (mainly for CI)",
-                    IS_GIT_CONFIG_WRITABLE
-                );
-                return Err(anyhow!("failed to get git global config"));
-            }
-        };
-
-        let config_file = git2::Config::find_global().map_or_else(
-            |e| {
-                trace!("global git config file not found: {e:?}");
-                Ok(dirs::home_dir()
-                    .context("Failed to get home dir")?
-                    .join(".gitconfig"))
-            },
-            Ok,
-        )?;
-        let f = match File::options()
-            .create(true)
-            .truncate(true)
-            .write(true)
-            .open(config_file)
-        {
+    /// This function will return an error if it failed to get home directory.
+    fn setup_gitconfig(path: &std::path::Path) -> Result<()> {
+        let git_dir = path.join(".git");
+        if !git_dir.exists() {
+            fs::DirBuilder::new().create(git_dir.clone())?
+        }
+        let f = match File::create_new(git_dir.join("config")) {
             io::Result::Ok(f) => f,
             io::Result::Err(_err) => return Ok(()),
         };
@@ -69,13 +34,16 @@ mod integrated_test {
             .as_bytes(),
         )?;
 
+        eprintln!("{:?}", fs::read_dir(path)?.collect::<Vec<_>>());
+        eprintln!("{:?}", fs::read_dir(git_dir)?.collect::<Vec<_>>());
+
         Ok(())
     }
 
     #[test]
     fn single_device() -> Result<()> {
         let config_dir = assert_fs::TempDir::new()?;
-        setup_gitconfig()?;
+        setup_gitconfig(&config_dir)?;
         // init
         let mut cmd = Command::cargo_bin("xdbm")?;
         cmd.arg("-c")
@@ -171,7 +139,7 @@ mod integrated_test {
     fn two_devices_with_same_name() -> Result<()> {
         // 1st device
         let config_dir_1 = assert_fs::TempDir::new()?;
-        setup_gitconfig()?;
+        setup_gitconfig(&config_dir_1)?;
         let mut cmd1 = Command::cargo_bin("xdbm")?;
         cmd1.arg("-c")
             .arg(config_dir_1.path())
@@ -204,7 +172,7 @@ mod integrated_test {
 
         // 2nd device
         let config_dir_2 = assert_fs::TempDir::new()?;
-        setup_gitconfig()?;
+        setup_gitconfig(&config_dir_2)?;
         let mut cmd2 = Command::cargo_bin("xdbm")?;
         cmd2.arg("-c")
             .arg(config_dir_2.path())
@@ -220,7 +188,7 @@ mod integrated_test {
     fn directory_without_parent() -> Result<()> {
         // 1st device
         let config_dir_1 = assert_fs::TempDir::new()?;
-        setup_gitconfig()?;
+        setup_gitconfig(&config_dir_1)?;
         let mut cmd1 = Command::cargo_bin("xdbm")?;
         cmd1.arg("-c")
             .arg(config_dir_1.path())
@@ -255,7 +223,7 @@ mod integrated_test {
         //
         // devices: first
         let config_dir_1 = assert_fs::TempDir::new()?;
-        setup_gitconfig()?;
+        setup_gitconfig(&config_dir_1)?;
         let mut cmd1 = Command::cargo_bin("xdbm")?;
         cmd1.arg("-c")
             .arg(config_dir_1.path())
@@ -289,7 +257,7 @@ mod integrated_test {
         //
         // devices: first, second
         let config_dir_2 = assert_fs::TempDir::new()?;
-        setup_gitconfig()?;
+        setup_gitconfig(&config_dir_2)?;
         let mut cmd2 = Command::cargo_bin("xdbm")?;
         cmd2.arg("-c")
             .arg(config_dir_2.path())