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+;;; test-config-utilities--with-timer.el --- Tests for the with-timer macro -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Tests for the `with-timer' macro from config-utilities.el. The macro
+;; runs FORMS, prints a timing message, and returns the value of FORMS.
+;; These tests verify that the macro preserves the result through the
+;; timing wrapper and that the announce/done messages fire.
+
+;;; Code:
+
+(require 'ert)
+(require 'cl-lib)
+
+(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
+(require 'config-utilities)
+
+(ert-deftest test-config-utilities-with-timer-returns-forms-value ()
+  "Normal: with-timer returns the value of the wrapped FORMS."
+  (let ((inhibit-message t))
+    (should (= 42 (with-timer "compute"
+                    (+ 40 2))))))
+
+(ert-deftest test-config-utilities-with-timer-evaluates-forms-once ()
+  "Boundary: with-timer evaluates the body exactly once.
+Guards against the macro accidentally re-evaluating FORMS for the
+elapsed-time message or similar."
+  (let ((counter 0)
+        (inhibit-message t))
+    (with-timer "count"
+      (cl-incf counter))
+    (should (= 1 counter))))
+
+(ert-deftest test-config-utilities-with-timer-emits-announce-and-done-messages ()
+  "Boundary: with-timer emits both \"TITLE...\" and \"TITLE... done\" messages."
+  (let (messages)
+    (cl-letf (((symbol-function 'message)
+               (lambda (fmt &rest args) (push (apply #'format fmt args) messages))))
+      (with-timer "tag"
+        :ignored))
+    (let ((all (string-join (nreverse messages) "\n")))
+      (should (string-match-p "^tag\\.\\.\\.$" all))
+      (should (string-match-p "^tag\\.\\.\\. done (" all)))))
+
+(ert-deftest test-config-utilities-with-timer-multiple-forms-returns-last ()
+  "Boundary: with-timer with multiple forms returns the last form's value."
+  (let ((inhibit-message t))
+    (should (equal "third"
+                   (with-timer "multi"
+                     "first"
+                     "second"
+                     "third")))))
+
+(provide 'test-config-utilities--with-timer)
+;;; test-config-utilities--with-timer.el ends here