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diff --git a/tests/test-gptel-tools-git-status.el b/tests/test-gptel-tools-git-status.el
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+++ b/tests/test-gptel-tools-git-status.el
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+;;; test-gptel-tools-git-status.el --- Tests for git_status gptel tool -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Tests run against real temp git repos under HOME via `process-file'.
+;; The tool is read-only so repos are torn down per test.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(eval-and-compile
+  (add-to-list 'load-path (expand-file-name "tests" user-emacs-directory))
+  (add-to-list 'load-path (expand-file-name "gptel-tools" user-emacs-directory))
+  (setq load-prefer-newer t)
+  (unless (featurep 'gptel)
+    (defvar gptel-tools nil)
+    (defun gptel-make-tool (&rest _args) nil)
+    (defun gptel-get-tool (&rest _args) nil)
+    (provide 'gptel)))
+
+(require 'git_status)
+
+;; ---------- helpers
+
+(defun test-gptel-tools-git-status--with-repo (fn)
+  "Create a temp git repo under HOME, call FN with its absolute path, clean up."
+  (let* ((name (format ".test-gptel-tools-git-status-%s"
+                       (format-time-string "%s%N")))
+         (dir (expand-file-name name "~")))
+    (unwind-protect
+        (progn
+          (make-directory dir)
+          (let ((default-directory dir))
+            (call-process "git" nil nil nil "init" "--quiet")
+            (call-process "git" nil nil nil "config" "user.email" "test@x")
+            (call-process "git" nil nil nil "config" "user.name" "Test")
+            (call-process "git" nil nil nil "commit" "--allow-empty"
+                          "--quiet" "-m" "initial"))
+          (funcall fn dir))
+      (when (file-exists-p dir) (delete-directory dir t)))))
+
+;; ---------- validate-path
+
+(ert-deftest test-gptel-tools-git-status-validate-path-normal ()
+  "Normal: validator accepts a directory inside a git working tree."
+  (test-gptel-tools-git-status--with-repo
+   (lambda (dir)
+     (should (equal (cj/gptel-git-status--validate-path dir) dir)))))
+
+(ert-deftest test-gptel-tools-git-status-validate-path-error-outside-home ()
+  "Error: path outside HOME signals."
+  (should-error (cj/gptel-git-status--validate-path "/etc")))
+
+(ert-deftest test-gptel-tools-git-status-validate-path-error-not-a-directory ()
+  "Error: path that's not a directory signals."
+  (let ((file (make-temp-file
+               (expand-file-name ".test-gptel-tools-git-status-" "~"))))
+    (unwind-protect
+        (should-error (cj/gptel-git-status--validate-path file))
+      (when (file-exists-p file) (delete-file file)))))
+
+(ert-deftest test-gptel-tools-git-status-validate-path-error-not-a-repo ()
+  "Error: directory outside any git working tree signals."
+  (let ((dir (make-temp-file
+              (expand-file-name ".test-gptel-tools-git-status-" "~") t)))
+    (unwind-protect
+        (should-error (cj/gptel-git-status--validate-path dir))
+      (when (file-exists-p dir) (delete-directory dir t)))))
+
+;; ---------- run
+
+(ert-deftest test-gptel-tools-git-status-run-clean-tree ()
+  "Normal: a clean repo returns the clean-tree marker."
+  (test-gptel-tools-git-status--with-repo
+   (lambda (dir)
+     (let ((out (cj/gptel-git-status--run dir)))
+       (should (string-match-p "Clean working tree" out))))))
+
+(ert-deftest test-gptel-tools-git-status-run-dirty-tree-includes-file ()
+  "Normal: an untracked file appears in the output."
+  (test-gptel-tools-git-status--with-repo
+   (lambda (dir)
+     (with-temp-file (expand-file-name "new.txt" dir) (insert "x"))
+     (let ((out (cj/gptel-git-status--run dir)))
+       (should (string-match-p "new.txt" out))
+       (should (string-match-p "^\\?\\?" out))))))
+
+(ert-deftest test-gptel-tools-git-status-run-includes-branch ()
+  "Normal: the `--branch' line surfaces in the output."
+  (test-gptel-tools-git-status--with-repo
+   (lambda (dir)
+     (with-temp-file (expand-file-name "f.txt" dir) (insert "x"))
+     (let ((out (cj/gptel-git-status--run dir)))
+       (should (string-match-p "^## " out))))))
+
+(provide 'test-gptel-tools-git-status)
+;;; test-gptel-tools-git-status.el ends here