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diff --git a/tests/test-fs-validate-path.el b/tests/test-fs-validate-path.el
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+;;; test-tool-library-cj/fs-validate-path.el --- ERT tests for cj/fs-validate-path -*- lexical-binding: t; -*-
+
+;; Author: gptel-tool-writer and cjennings
+;; Keywords: tests, filesystem, tools
+
+;;; Commentary:
+;; ERT tests for the cj/fs-validate-path 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)
+
+(ert-deftest test-cj/fs-validate-path-normal-home ()
+  "Normal: validate home directory path."
+  (should (string-prefix-p (expand-file-name "~")
+						   (cj/fs-validate-path "~"))))
+
+(ert-deftest test-cj/fs-validate-path-normal-temp ()
+  "Normal: validate temp directory path."
+  (let ((temp (expand-file-name temporary-file-directory)))
+	(should (string-prefix-p temp (cj/fs-validate-path temp)))))
+
+(ert-deftest test-cj/fs-validate-path-error-outside ()
+  "Error: path outside allowed directories."
+  (should-error (cj/fs-validate-path "/etc/passwd")))
+
+(ert-deftest test-cj/fs-validate-path-error-nonexistent ()
+  "Error: non-existent path."
+  (should-error (cj/fs-validate-path (format "/tmp/nonexistent-%d" (random 100000)))))
+
+(ert-deftest test-cj/fs-validate-path-error-unreadable ()
+  "Error: unreadable path."
+  (let ((file (make-temp-file "test-unreadable")))
+	(unwind-protect
+		(progn
+		  (set-file-modes file 0)
+		  (should-error (cj/fs-validate-path file)))
+	  (set-file-modes file #o644)
+	  (delete-file file))))
+
+(provide 'test-tool-library-cj/fs-validate-path)
+;;; test-tool-library-cj/fs-validate-path.el ends here