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+;;; test-chime--truncate-title.el --- Tests for chime--truncate-title -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2024 Craig Jennings
+
+;; Author: Craig Jennings <c@cjennings.net>
+
+;; This program is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Unit tests for chime--truncate-title function.
+;; Tests title truncation with ellipsis based on chime-max-title-length.
+
+;;; Code:
+
+;; Initialize package system for batch mode
+(when noninteractive
+  (package-initialize))
+
+(require 'ert)
+(require 'dash)
+(require 'alert)
+
+;; Load chime from parent directory
+(load (expand-file-name "../chime.el") nil t)
+
+;;; Setup and Teardown
+
+(defun test-chime--truncate-title-setup ()
+  "Setup test environment."
+  ;; No special setup needed
+  )
+
+(defun test-chime--truncate-title-teardown ()
+  "Teardown test environment."
+  ;; No special teardown needed
+  )
+
+;;; Normal Cases
+
+(ert-deftest test-chime--truncate-title-normal-short-title-unchanged ()
+  "Test that short title under max length is unchanged."
+  (test-chime--truncate-title-setup)
+  (unwind-protect
+      (let ((chime-max-title-length 20))
+        (should (equal (chime--truncate-title "Short title")
+                      "Short title")))
+    (test-chime--truncate-title-teardown)))
+
+(ert-deftest test-chime--truncate-title-normal-long-title-truncated-with-ellipsis ()
+  "Test that long title is truncated with ... appended."
+  (test-chime--truncate-title-setup)
+  (unwind-protect
+      (let ((chime-max-title-length 15))
+        (should (equal (chime--truncate-title "This is a very long title that needs truncation")
+                      "This is a ve...")))
+    (test-chime--truncate-title-teardown)))
+
+(ert-deftest test-chime--truncate-title-normal-unicode-characters-truncated-correctly ()
+  "Test that unicode characters are handled correctly in truncation."
+  (test-chime--truncate-title-setup)
+  (unwind-protect
+      (let ((chime-max-title-length 10))
+        (should (equal (chime--truncate-title "Meeting 🎉 with team")
+                      "Meeting...")))
+    (test-chime--truncate-title-teardown)))
+
+;;; Boundary Cases
+
+(ert-deftest test-chime--truncate-title-boundary-exact-max-length-unchanged ()
+  "Test that title exactly at max length is unchanged."
+  (test-chime--truncate-title-setup)
+  (unwind-protect
+      (let ((chime-max-title-length 12))
+        (should (equal (chime--truncate-title "Twelve chars")
+                      "Twelve chars")))
+    (test-chime--truncate-title-teardown)))
+
+(ert-deftest test-chime--truncate-title-boundary-one-char-over-max-truncated ()
+  "Test that title one character over max is truncated."
+  (test-chime--truncate-title-setup)
+  (unwind-protect
+      (let ((chime-max-title-length 10))
+        (should (equal (chime--truncate-title "Eleven char")
+                      "Eleven ...")))
+    (test-chime--truncate-title-teardown)))
+
+(ert-deftest test-chime--truncate-title-boundary-empty-string-returns-empty ()
+  "Test that empty string returns empty string."
+  (test-chime--truncate-title-setup)
+  (unwind-protect
+      (let ((chime-max-title-length 20))
+        (should (equal (chime--truncate-title "")
+                      "")))
+    (test-chime--truncate-title-teardown)))
+
+;;; Error Cases
+
+(ert-deftest test-chime--truncate-title-error-nil-title-returns-empty ()
+  "Test that nil title returns empty string."
+  (test-chime--truncate-title-setup)
+  (unwind-protect
+      (let ((chime-max-title-length 20))
+        (should (equal (chime--truncate-title nil)
+                      "")))
+    (test-chime--truncate-title-teardown)))
+
+(provide 'test-chime--truncate-title)
+;;; test-chime--truncate-title.el ends here