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diff --git a/tests/test-fs-get-file-info.el b/tests/test-fs-get-file-info.el
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+;;; test-tool-library-fs-get-file-info.el --- ERT tests for cj/fs-get-file-info -*- lexical-binding: t; -*-
+
+;; Author: gptel-tool-writer and cjennings
+;; Keywords: tests, filesystem, tools
+
+;;; Commentary:
+;; ERT tests for the cj/fs-get-file-info function from tool-filesystem-library.el.
+;; Place this file in ~/.emacs.d/tests/ and load it to run tests.
+
+;;; Code:
+
+(require 'ert)
+(require 'f)
+(require 'tool-filesystem-library)
+
+(defvar cj/fs-test--temp-dir nil "Temporary test directory for fs-get-file-info tests.")
+
+(defun cj/fs-test--setup ()
+  "Setup temporary directory for fs-get-file-info tests."
+  (setq cj/fs-test--temp-dir (make-temp-file "fs-lib-test" t))
+  ;; Create test files and directories
+  (make-directory (f-join cj/fs-test--temp-dir "subdir") t)
+  (with-temp-buffer (insert "Test content") (write-file (f-join cj/fs-test--temp-dir "test-file.txt")))
+  (make-directory (f-join cj/fs-test--temp-dir "subdir") t)
+  (with-temp-buffer (insert "Nested test") (write-file (f-join cj/fs-test--temp-dir "subdir/nested-file.txt"))))
+
+(defun cj/fs-test--teardown ()
+  "Clean up temporary directory for fs-get-file-info tests."
+  (when (and cj/fs-test--temp-dir (file-directory-p cj/fs-test--temp-dir))
+	(delete-directory cj/fs-test--temp-dir t))
+  (setq cj/fs-test--temp-dir nil))
+
+(ert-deftest test-cj/fs-get-file-info-normal-regular-file ()
+  "Normal: info for regular file."
+  (cj/fs-test--setup)
+  (unwind-protect
+	  (let ((info (cj/fs-get-file-info (f-join cj/fs-test--temp-dir "test-file.txt"))))
+		(should (plist-get info :success))
+		(should (string-suffix-p "test-file.txt" (plist-get info :path)))
+		(should (not (plist-get info :directory))))
+	(cj/fs-test--teardown)))
+
+(ert-deftest test-cj/fs-get-file-info-normal-directory ()
+  "Normal: info for directory."
+  (cj/fs-test--setup)
+  (unwind-protect
+	  (let ((info (cj/fs-get-file-info (f-join cj/fs-test--temp-dir "subdir"))))
+		(should (plist-get info :success))
+		(should (string-suffix-p "subdir" (plist-get info :path)))
+		(should (plist-get info :directory)))
+	(cj/fs-test--teardown)))
+
+(ert-deftest test-cj/fs-get-file-info-error-nonexistent ()
+  "Error: non-existent file returns :success nil plist."
+  (let ((info (cj/fs-get-file-info "/tmp/nonexistent-file-1234567890")))
+	(should (not (plist-get info :success)))
+	(should (stringp (plist-get info :error)))))
+
+(ert-deftest test-cj/fs-get-file-info-error-permission-denied ()
+  "Error: permission denied file returns :success nil plist."
+  (cj/fs-test--setup)
+  (let ((file (f-join cj/fs-test--temp-dir "protected-file")))
+	(unwind-protect
+		(progn
+		  (with-temp-buffer (insert "secret") (write-file file))
+		  (set-file-modes file #o000)
+		  (let ((info (cj/fs-get-file-info file)))
+			(should (not (plist-get info :success)))
+			(should (stringp (plist-get info :error)))))
+	  (set-file-modes file #o644)
+	  (delete-file file)
+	  (cj/fs-test--teardown))))
+
+(provide 'test-tool-library-fs-get-file-info)
+;;; test-tool-library-fs-get-file-info.el ends here