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diff --git a/tests/test-fs--mode-to-permissions.el b/tests/test-fs--mode-to-permissions.el
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+;;; test-tool-library-fs--mode-to-permissions.el --- ERT tests for cj/fs--mode-to-permissions -*- lexical-binding: t; -*-
+
+;; Author: gptel-tool-writer and cjennings
+;; Keywords: tests, filesystem, tools
+
+;;; Commentary:
+;; ERT tests for the cj/fs--mode-to-permissions function from tool-filesystem-library.el.
+;; Place this file in ~/.emacs.d/tests/ and load it to run tests.
+
+;;; Code:
+
+(require 'ert)
+(require 'tool-filesystem-library)
+
+(ert-deftest test-cj/fs--mode-to-permissions-normal-directory ()
+  "Normal: directory permissions string."
+  (should (string-prefix-p "d"
+                           (cj/fs--mode-to-permissions #o40755))))
+
+(ert-deftest test-cj/fs--mode-to-permissions-normal-regular-file ()
+  "Normal: regular file permissions string."
+  (should (string-prefix-p "-"
+                           (cj/fs--mode-to-permissions #o100644))))
+
+(ert-deftest test-cj/fs--mode-to-permissions-boundary-zero ()
+  "Boundary: no permissions."
+  (should (string= "----------"
+				   (cj/fs--mode-to-permissions 0))))
+
+(ert-deftest test-cj/fs--mode-to-permissions-boundary-full ()
+  "Boundary: full permissions string."
+  (should (string= "-rwxrwxrwx"
+				   (cj/fs--mode-to-permissions #o777))))
+
+(provide 'test-tool-library-fs--mode-to-permissions)
+;;; test-tool-library-fs--mode-to-permissions.el ends here