diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 7cee19b..c307ec5 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -8,6 +8,7 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
+  XDBM_ENABLE_OVERWRITE_GITCONFIG: true
 
 jobs:
   build-and-lint:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 77119fe..4a1a66f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # 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 5041385..06e3890 100644
--- a/tests/cli.rs
+++ b/tests/cli.rs
@@ -4,23 +4,58 @@ mod integrated_test {
         io::{self, BufWriter, Write},
     };
 
-    use anyhow::{Ok, Result};
+    use anyhow::{anyhow, Context, Ok, Result};
     use assert_cmd::{assert::OutputAssertExt, Command};
     use git2::Repository;
-    use log::trace;
+    use log::{debug, 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 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")) {
+    /// 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)
+        {
             io::Result::Ok(f) => f,
             io::Result::Err(_err) => return Ok(()),
         };
@@ -34,16 +69,13 @@ 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(&config_dir)?;
+        setup_gitconfig()?;
         // init
         let mut cmd = Command::cargo_bin("xdbm")?;
         cmd.arg("-c")
@@ -139,7 +171,7 @@ mod integrated_test {
     fn two_devices_with_same_name() -> Result<()> {
         // 1st device
         let config_dir_1 = assert_fs::TempDir::new()?;
-        setup_gitconfig(&config_dir_1)?;
+        setup_gitconfig()?;
         let mut cmd1 = Command::cargo_bin("xdbm")?;
         cmd1.arg("-c")
             .arg(config_dir_1.path())
@@ -172,7 +204,7 @@ mod integrated_test {
 
         // 2nd device
         let config_dir_2 = assert_fs::TempDir::new()?;
-        setup_gitconfig(&config_dir_2)?;
+        setup_gitconfig()?;
         let mut cmd2 = Command::cargo_bin("xdbm")?;
         cmd2.arg("-c")
             .arg(config_dir_2.path())
@@ -188,7 +220,7 @@ mod integrated_test {
     fn directory_without_parent() -> Result<()> {
         // 1st device
         let config_dir_1 = assert_fs::TempDir::new()?;
-        setup_gitconfig(&config_dir_1)?;
+        setup_gitconfig()?;
         let mut cmd1 = Command::cargo_bin("xdbm")?;
         cmd1.arg("-c")
             .arg(config_dir_1.path())
@@ -223,7 +255,7 @@ mod integrated_test {
         //
         // devices: first
         let config_dir_1 = assert_fs::TempDir::new()?;
-        setup_gitconfig(&config_dir_1)?;
+        setup_gitconfig()?;
         let mut cmd1 = Command::cargo_bin("xdbm")?;
         cmd1.arg("-c")
             .arg(config_dir_1.path())
@@ -257,7 +289,7 @@ mod integrated_test {
         //
         // devices: first, second
         let config_dir_2 = assert_fs::TempDir::new()?;
-        setup_gitconfig(&config_dir_2)?;
+        setup_gitconfig()?;
         let mut cmd2 = Command::cargo_bin("xdbm")?;
         cmd2.arg("-c")
             .arg(config_dir_2.path())