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+;;; test-chime-has-timestamp.el --- Tests for chime--has-timestamp -*- 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--has-timestamp 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-has-timestamp-setup ()
+  "Setup function run before each test."
+  (chime-create-test-base-dir))
+
+(defun test-chime-has-timestamp-teardown ()
+  "Teardown function run after each test."
+  (chime-delete-test-base-dir))
+
+;;; Normal Cases
+
+(ert-deftest test-chime-has-timestamp-standard-timestamp-with-time-returns-non-nil ()
+  "Test that standard timestamp with time returns non-nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "<2025-10-24 Fri 14:30>")
+             (result (chime--has-timestamp timestamp)))
+        (should result))
+    (test-chime-has-timestamp-teardown)))
+
+(ert-deftest test-chime-has-timestamp-timestamp-without-brackets-returns-non-nil ()
+  "Test that timestamp without brackets but with time returns non-nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "2025-10-24 Fri 14:30")
+             (result (chime--has-timestamp timestamp)))
+        (should result))
+    (test-chime-has-timestamp-teardown)))
+
+(ert-deftest test-chime-has-timestamp-timestamp-with-time-range-returns-non-nil ()
+  "Test that timestamp with time range returns non-nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "<2025-10-24 Fri 14:00-15:30>")
+             (result (chime--has-timestamp timestamp)))
+        (should result))
+    (test-chime-has-timestamp-teardown)))
+
+(ert-deftest test-chime-has-timestamp-scheduled-with-time-returns-non-nil ()
+  "Test that SCHEDULED timestamp with time returns non-nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "SCHEDULED: <2025-10-24 Fri 09:00>")
+             (result (chime--has-timestamp timestamp)))
+        (should result))
+    (test-chime-has-timestamp-teardown)))
+
+(ert-deftest test-chime-has-timestamp-deadline-with-time-returns-non-nil ()
+  "Test that DEADLINE timestamp with time returns non-nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "DEADLINE: <2025-10-24 Fri 17:00>")
+             (result (chime--has-timestamp timestamp)))
+        (should result))
+    (test-chime-has-timestamp-teardown)))
+
+(ert-deftest test-chime-has-timestamp-repeater-with-time-returns-non-nil ()
+  "Test that timestamp with repeater and time returns non-nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "<2025-10-24 Fri 14:00 +1w>")
+             (result (chime--has-timestamp timestamp)))
+        (should result))
+    (test-chime-has-timestamp-teardown)))
+
+(ert-deftest test-chime-has-timestamp-midnight-timestamp-returns-non-nil ()
+  "Test that midnight timestamp (00:00) returns non-nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "<2025-10-24 Fri 00:00>")
+             (result (chime--has-timestamp timestamp)))
+        (should result))
+    (test-chime-has-timestamp-teardown)))
+
+;;; Boundary Cases
+
+(ert-deftest test-chime-has-timestamp-day-wide-timestamp-returns-nil ()
+  "Test that day-wide timestamp without time returns nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "<2025-10-24 Fri>")
+             (result (chime--has-timestamp timestamp)))
+        (should-not result))
+    (test-chime-has-timestamp-teardown)))
+
+(ert-deftest test-chime-has-timestamp-date-only-returns-nil ()
+  "Test that date-only timestamp without day name returns nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "<2025-10-24>")
+             (result (chime--has-timestamp timestamp)))
+        (should-not result))
+    (test-chime-has-timestamp-teardown)))
+
+(ert-deftest test-chime-has-timestamp-single-digit-hour-returns-non-nil ()
+  "Test that timestamp with single-digit hour returns non-nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "<2025-10-24 Fri 9:00>")
+             (result (chime--has-timestamp timestamp)))
+        (should result))
+    (test-chime-has-timestamp-teardown)))
+
+(ert-deftest test-chime-has-timestamp-embedded-in-text-returns-non-nil ()
+  "Test that timestamp embedded in text returns non-nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "Meeting scheduled for <2025-10-24 Fri 14:00> in conference room")
+             (result (chime--has-timestamp timestamp)))
+        (should result))
+    (test-chime-has-timestamp-teardown)))
+
+(ert-deftest test-chime-has-timestamp-multiple-timestamps-returns-non-nil ()
+  "Test that string with multiple timestamps returns non-nil for first match."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "<2025-10-24 Fri 14:00> and <2025-10-25 Sat 15:00>")
+             (result (chime--has-timestamp timestamp)))
+        (should result))
+    (test-chime-has-timestamp-teardown)))
+
+;;; Error Cases
+
+(ert-deftest test-chime-has-timestamp-empty-string-returns-nil ()
+  "Test that empty string returns nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "")
+             (result (chime--has-timestamp timestamp)))
+        (should-not result))
+    (test-chime-has-timestamp-teardown)))
+
+(ert-deftest test-chime-has-timestamp-nil-input-returns-nil ()
+  "Test that nil input returns nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp nil)
+             (result (chime--has-timestamp timestamp)))
+        (should-not result))
+    (test-chime-has-timestamp-teardown)))
+
+(ert-deftest test-chime-has-timestamp-no-timestamp-returns-nil ()
+  "Test that string without timestamp returns nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "Just a regular string with no timestamp")
+             (result (chime--has-timestamp timestamp)))
+        (should-not result))
+    (test-chime-has-timestamp-teardown)))
+
+(ert-deftest test-chime-has-timestamp-invalid-format-returns-nil ()
+  "Test that invalid timestamp format returns nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "<10-24-2025 Fri 14:00>")
+             (result (chime--has-timestamp timestamp)))
+        (should-not result))
+    (test-chime-has-timestamp-teardown)))
+
+(ert-deftest test-chime-has-timestamp-partial-timestamp-returns-nil ()
+  "Test that partial timestamp returns nil."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "<2025-10-24")
+             (result (chime--has-timestamp timestamp)))
+        (should-not result))
+    (test-chime-has-timestamp-teardown)))
+
+;;; org-gcal Integration Tests
+
+(ert-deftest test-chime-has-timestamp-org-gcal-time-range-returns-non-nil ()
+  "Test that org-gcal time range format is detected.
+org-gcal uses format like <2025-10-24 Fri 17:30-18:00> which should be detected."
+  (test-chime-has-timestamp-setup)
+  (unwind-protect
+      (let* ((timestamp "<2025-10-24 Fri 17:30-18:00>")
+             (result (chime--has-timestamp timestamp)))
+        (should result))
+    (test-chime-has-timestamp-teardown)))
+
+(provide 'test-chime-has-timestamp)
+;;; test-chime-has-timestamp.el ends here