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+;;; test-chime--time=.el --- Tests for chime--time= -*- 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--time= function.
+;; Tests timestamp comparison ignoring seconds component.
+
+;;; 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--time=-setup ()
+  "Setup test environment."
+  ;; No special setup needed
+  )
+
+(defun test-chime--time=-teardown ()
+  "Teardown test environment."
+  ;; No special teardown needed
+  )
+
+;;; Normal Cases
+
+(ert-deftest test-chime--time=-normal-two-equal-times-returns-true ()
+  "Test that two timestamps with same day/hour/minute return true."
+  (test-chime--time=-setup)
+  (unwind-protect
+      (let* ((time1 (encode-time 15 30 14 8 11 2025))  ; 2025-11-08 14:30:15
+             (time2 (encode-time 45 30 14 8 11 2025))) ; 2025-11-08 14:30:45 (different seconds)
+        (should (chime--time= time1 time2)))
+    (test-chime--time=-teardown)))
+
+(ert-deftest test-chime--time=-normal-three-equal-times-returns-true ()
+  "Test that three timestamps with same day/hour/minute return true."
+  (test-chime--time=-setup)
+  (unwind-protect
+      (let* ((time1 (encode-time 10 45 9 8 11 2025))
+             (time2 (encode-time 20 45 9 8 11 2025))
+             (time3 (encode-time 55 45 9 8 11 2025)))
+        (should (chime--time= time1 time2 time3)))
+    (test-chime--time=-teardown)))
+
+(ert-deftest test-chime--time=-normal-two-different-times-returns-nil ()
+  "Test that timestamps with different hour/minute return nil."
+  (test-chime--time=-setup)
+  (unwind-protect
+      (let* ((time1 (encode-time 0 30 14 8 11 2025))  ; 14:30
+             (time2 (encode-time 0 31 14 8 11 2025))) ; 14:31
+        (should-not (chime--time= time1 time2)))
+    (test-chime--time=-teardown)))
+
+;;; Boundary Cases
+
+(ert-deftest test-chime--time=-boundary-single-time-returns-true ()
+  "Test that single timestamp returns true."
+  (test-chime--time=-setup)
+  (unwind-protect
+      (let ((time (encode-time 0 0 12 8 11 2025)))
+        (should (chime--time= time)))
+    (test-chime--time=-teardown)))
+
+(ert-deftest test-chime--time=-boundary-empty-list-returns-nil ()
+  "Test that empty argument list returns nil."
+  (test-chime--time=-setup)
+  (unwind-protect
+      ;; Empty list has no elements, unique length is 0, not 1
+      (should-not (chime--time= ))
+    (test-chime--time=-teardown)))
+
+(ert-deftest test-chime--time=-boundary-different-days-same-time-returns-nil ()
+  "Test that same time on different days returns nil."
+  (test-chime--time=-setup)
+  (unwind-protect
+      (let* ((time1 (encode-time 0 30 14 8 11 2025))   ; Nov 8
+             (time2 (encode-time 0 30 14 9 11 2025)))  ; Nov 9
+        (should-not (chime--time= time1 time2)))
+    (test-chime--time=-teardown)))
+
+(provide 'test-chime--time=)
+;;; test-chime--time=.el ends here