diff --git a/nash/tests/cli.rs b/nash/tests/cli.rs
index ce7aa74..803328b 100644
--- a/nash/tests/cli.rs
+++ b/nash/tests/cli.rs
@@ -57,3 +57,43 @@ fn positional_args_survive_short_flags_after_dash_c() {
 fn combined_dash_lc_still_works() {
     assert_eq!(stdout_of(&["--noprofile", "--norc", "-lc", "echo hi"]), "hi\n");
 }
+
+#[test]
+fn dot_builtin_finds_git_setup_script_on_path() {
+    let scratch = std::env::temp_dir().join(format!("nash-dot-path-{}", std::process::id()));
+    let path_dir = scratch.join("git-core");
+    let work_dir = scratch.join("worktree");
+    let _ = std::fs::remove_dir_all(&scratch);
+    std::fs::create_dir_all(&path_dir).unwrap();
+    std::fs::create_dir_all(&work_dir).unwrap();
+    std::fs::write(
+        path_dir.join("git-sh-setup"),
+        "require_work_tree() { echo sourced-git-setup; }\n",
+    )
+    .unwrap();
+
+    // git-subtree uses this exact shape: GIT_EXEC_PATH is prepended to PATH,
+    // then the script says `. git-sh-setup` without a slash.
+    let output = Command::new(env!("CARGO_BIN_EXE_nash"))
+        .args([
+            "--noprofile",
+            "--norc",
+            "-c",
+            ". git-sh-setup; require_work_tree",
+        ])
+        .env("PATH", &path_dir)
+        .current_dir(&work_dir)
+        .output()
+        .expect("spawn nash");
+
+    let _ = std::fs::remove_dir_all(&scratch);
+    assert!(
+        output.status.success(),
+        "nash failed: {}",
+        String::from_utf8_lossy(&output.stderr)
+    );
+    assert_eq!(
+        String::from_utf8_lossy(&output.stdout),
+        "sourced-git-setup\n"
+    );
+}