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diff --git a/tests/test-chime-update-modeline.el b/tests/test-chime-update-modeline.el
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+;;; test-chime-update-modeline.el --- Tests for chime--update-modeline -*- 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--update-modeline function.
+;; Tests cover normal cases, boundary cases, and error cases.
+
+;;; Code:
+
+;; Initialize package system for batch mode
+(when noninteractive
+  (package-initialize))
+
+(require 'ert)
+
+;; Load dependencies required by chime
+(require 'dash)
+(require 'alert)
+(require 'async)
+(require 'org-agenda)
+
+;; Load chime from parent directory
+(load (expand-file-name "../chime.el") nil t)
+
+;; Load test utilities
+(require 'testutil-general (expand-file-name "testutil-general.el"))
+
+;;; Setup and Teardown
+
+(defun test-chime-update-modeline-setup ()
+  "Setup function run before each test."
+  (chime-create-test-base-dir)
+  ;; Reset modeline settings
+  (setq chime-modeline-string nil)
+  (setq chime-modeline-lookahead 30)
+  (setq chime-modeline-format " ⏰ %s"))
+
+(defun test-chime-update-modeline-teardown ()
+  "Teardown function run after each test."
+  (chime-delete-test-base-dir)
+  (setq chime-modeline-string nil))
+
+;;; Normal Cases
+
+(ert-deftest test-chime-update-modeline-single-event-within-window-updates-modeline ()
+  "Test that single event within lookahead window updates modeline."
+  (test-chime-update-modeline-setup)
+  (unwind-protect
+      (cl-letf* ((mock-time (encode-time 0 0 14 24 10 2025))
+                 ((symbol-function 'current-time) (lambda () mock-time))
+                 ((symbol-function 'force-mode-line-update) (lambda ()))
+                 ;; Event at 14:10 (10 minutes from now)
+                 (event-time (encode-time 0 10 14 24 10 2025))
+                 (event `((times . ((("<2025-10-24 Fri 14:10>" . ,event-time))))
+                          (title . "Team Meeting")))
+                 (events (list event)))
+        (chime--update-modeline events)
+        ;; Should set modeline string
+        (should chime-modeline-string)
+        (should (stringp chime-modeline-string))
+        (should (string-match-p "Team Meeting" chime-modeline-string))
+        (should (string-match-p "10 minutes" chime-modeline-string)))
+    (test-chime-update-modeline-teardown)))
+
+(ert-deftest test-chime-update-modeline-multiple-events-picks-soonest ()
+  "Test that with multiple events, soonest one is shown."
+  (test-chime-update-modeline-setup)
+  (unwind-protect
+      (cl-letf* ((mock-time (encode-time 0 0 14 24 10 2025))
+                 ((symbol-function 'current-time) (lambda () mock-time))
+                 ((symbol-function 'force-mode-line-update) (lambda ()))
+                 ;; Event 1 at 14:05 (5 minutes - soonest)
+                 (event-time-1 (encode-time 0 5 14 24 10 2025))
+                 (event1 `((times . ((("<2025-10-24 Fri 14:05>" . ,event-time-1))))
+                           (title . "Standup")))
+                 ;; Event 2 at 14:25 (25 minutes)
+                 (event-time-2 (encode-time 0 25 14 24 10 2025))
+                 (event2 `((times . ((("<2025-10-24 Fri 14:25>" . ,event-time-2))))
+                           (title . "Code Review")))
+                 (events (list event1 event2)))
+        (chime--update-modeline events)
+        ;; Should show the soonest event
+        (should chime-modeline-string)
+        (should (string-match-p "Standup" chime-modeline-string))
+        (should-not (string-match-p "Code Review" chime-modeline-string)))
+    (test-chime-update-modeline-teardown)))
+
+(ert-deftest test-chime-update-modeline-event-outside-window-no-update ()
+  "Test that event outside lookahead window doesn't update modeline."
+  (test-chime-update-modeline-setup)
+  (unwind-protect
+      (cl-letf* ((mock-time (encode-time 0 0 14 24 10 2025))
+                 ((symbol-function 'current-time) (lambda () mock-time))
+                 ((symbol-function 'force-mode-line-update) (lambda ()))
+                 ;; Event at 15:10 (70 minutes from now, outside 30 minute window)
+                 (event-time (encode-time 0 10 15 24 10 2025))
+                 (event `((times . ((("<2025-10-24 Fri 15:10>" . ,event-time))))
+                          (title . "Far Future Event")))
+                 (events (list event)))
+        (chime--update-modeline events)
+        ;; Should NOT set modeline string
+        (should-not chime-modeline-string))
+    (test-chime-update-modeline-teardown)))
+
+(ert-deftest test-chime-update-modeline-zero-lookahead-clears-modeline ()
+  "Test that zero lookahead clears modeline."
+  (test-chime-update-modeline-setup)
+  (unwind-protect
+      (cl-letf* ((mock-time (encode-time 0 0 14 24 10 2025))
+                 ((symbol-function 'current-time) (lambda () mock-time))
+                 ((symbol-function 'force-mode-line-update) (lambda ()))
+                 (event-time (encode-time 0 10 14 24 10 2025))
+                 (event `((times . ((("<2025-10-24 Fri 14:10>" . ,event-time))))
+                          (title . "Team Meeting")))
+                 (events (list event)))
+        (setq chime-modeline-lookahead 0)
+        (chime--update-modeline events)
+        ;; Should clear modeline
+        (should-not chime-modeline-string))
+    (test-chime-update-modeline-teardown)))
+
+;;; Boundary Cases
+
+(ert-deftest test-chime-update-modeline-no-events-clears-modeline ()
+  "Test that no events clears modeline."
+  (test-chime-update-modeline-setup)
+  (unwind-protect
+      (cl-letf* ((mock-time (encode-time 0 0 14 24 10 2025))
+                 ((symbol-function 'current-time) (lambda () mock-time))
+                 ((symbol-function 'force-mode-line-update) (lambda ()))
+                 (events '()))
+        (chime--update-modeline events)
+        (should-not chime-modeline-string))
+    (test-chime-update-modeline-teardown)))
+
+(ert-deftest test-chime-update-modeline-day-wide-events-filtered-out ()
+  "Test that day-wide events are filtered out."
+  (test-chime-update-modeline-setup)
+  (unwind-protect
+      (cl-letf* ((mock-time (encode-time 0 0 14 24 10 2025))
+                 ((symbol-function 'current-time) (lambda () mock-time))
+                 ((symbol-function 'force-mode-line-update) (lambda ()))
+                 (event-time (encode-time 0 0 0 24 10 2025))
+                 (event `((times . ((("<2025-10-24 Fri>" . ,event-time))))
+                          (title . "All Day Event")))
+                 (events (list event)))
+        (chime--update-modeline events)
+        (should-not chime-modeline-string))
+    (test-chime-update-modeline-teardown)))
+
+(ert-deftest test-chime-update-modeline-event-at-exact-boundary-included ()
+  "Test that event at exact lookahead boundary is included."
+  (test-chime-update-modeline-setup)
+  (unwind-protect
+      (cl-letf* ((mock-time (encode-time 0 0 14 24 10 2025))
+                 ((symbol-function 'current-time) (lambda () mock-time))
+                 ((symbol-function 'force-mode-line-update) (lambda ()))
+                 ;; Event at 14:30 (exactly 30 minutes, at boundary)
+                 (event-time (encode-time 0 30 14 24 10 2025))
+                 (event `((times . ((("<2025-10-24 Fri 14:30>" . ,event-time))))
+                          (title . "Boundary Event")))
+                 (events (list event)))
+        (chime--update-modeline events)
+        (should chime-modeline-string)
+        (should (string-match-p "Boundary Event" chime-modeline-string)))
+    (test-chime-update-modeline-teardown)))
+
+;;; Error Cases
+
+(ert-deftest test-chime-update-modeline-past-events-not-shown ()
+  "Test that past events are not shown in modeline."
+  (test-chime-update-modeline-setup)
+  (unwind-protect
+      (cl-letf* ((mock-time (encode-time 0 0 14 24 10 2025))
+                 ((symbol-function 'current-time) (lambda () mock-time))
+                 ((symbol-function 'force-mode-line-update) (lambda ()))
+                 ;; Event at 13:50 (10 minutes ago)
+                 (event-time (encode-time 0 50 13 24 10 2025))
+                 (event `((times . ((("<2025-10-24 Fri 13:50>" . ,event-time))))
+                          (title . "Past Event")))
+                 (events (list event)))
+        (chime--update-modeline events)
+        (should-not chime-modeline-string))
+    (test-chime-update-modeline-teardown)))
+
+(provide 'test-chime-update-modeline)
+;;; test-chime-update-modeline.el ends here