test: close coverage gaps to 99.88% line coverage

Five new test files cover branches the per-function suites missed: the day-wide notification pipeline, the jump-to-event navigation path (including the org-show-entry fallback for Org < 9.6), chime--stop's process-interrupt branch, chime--start's debug log, and the two async error branches in chime--fetch-and-process. The edge-coverage file mops up scattered one-line fallbacks: the day-wide-notification "today" path, the tooltip placeholder pass-through, timestamp-parse's no-context error message, log-silently's mid-line newline insert, the validation :error count, and record-async-failure's chime-debug hook.

Line coverage on chime.el goes from 97.1% to 99.88%, 823 of 824 coverable lines. The one remaining line is a pcase _ fallback the preceding regex can't reach.

1 files changed, 80 insertions, 0 deletions

diff --git a/tests/test-chime-day-wide-notifications.el b/tests/test-chime-day-wide-notifications.el
new file mode 100644
index 0000000..260abfc
--- /dev/null
+++ b/tests/test-chime-day-wide-notifications.el
@@ -0,0 +1,80 @@
+;;; test-chime-day-wide-notifications.el --- Tests for chime--day-wide-notifications -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2026 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.
+
+;;; Commentary:
+
+;; Direct unit tests for `chime--day-wide-notifications', which combines the
+;; day-wide filter, the notification-text builder, dedup, and severity
+;; wrapping into a single pipeline.
+;;
+;; Mock-clock note: `with-test-time' replaces `current-time' with a lambda
+;; that returns the captured base time.  The base must be computed BEFORE
+;; entering the macro, because `test-time-now' itself calls `current-time'
+;; — passing `(test-time-now)' inside the macro causes infinite recursion.
+
+;;; Code:
+
+(require 'test-bootstrap (expand-file-name "test-bootstrap.el"))
+(require 'testutil-time (expand-file-name "testutil-time.el"))
+
+(ert-deftest test-chime-day-wide-notifications-normal-wraps-with-medium-severity ()
+  "Normal: each generated text is wrapped as (TEXT . \\='medium)."
+  (let* ((base (test-time-now))
+         (today (test-time-today-at 0 0))
+         (ts (test-timestamp-string today t))
+         (event (chime--make-event (list (cons ts nil))
+                                   "Birthday"
+                                   '((0 . medium))))
+         (chime-day-wide-advance-notice nil)
+         (chime-show-any-overdue-with-day-wide-alerts t))
+    (with-test-time base
+      (let ((result (chime--day-wide-notifications (list event))))
+        (should (= 1 (length result)))
+        (should (eq 'medium (cdr (car result))))
+        (should (stringp (car (car result))))
+        (should (string-match-p "Birthday" (car (car result))))))))
+
+(ert-deftest test-chime-day-wide-notifications-boundary-empty-events ()
+  "Boundary: empty events list yields empty notification list."
+  (should (null (chime--day-wide-notifications '()))))
+
+(ert-deftest test-chime-day-wide-notifications-boundary-deduplicates-identical-text ()
+  "Boundary: two events producing identical notification text collapse to one."
+  (let* ((base (test-time-now))
+         (today (test-time-today-at 0 0))
+         (ts (test-timestamp-string today t))
+         (event1 (chime--make-event (list (cons ts nil))
+                                    "Birthday"
+                                    '((0 . medium))))
+         (event2 (chime--make-event (list (cons ts nil))
+                                    "Birthday"
+                                    '((0 . medium))))
+         (chime-day-wide-advance-notice nil)
+         (chime-show-any-overdue-with-day-wide-alerts t))
+    (with-test-time base
+      (let ((result (chime--day-wide-notifications (list event1 event2))))
+        (should (= 1 (length result)))))))
+
+(ert-deftest test-chime-day-wide-notifications-boundary-filters-non-day-wide-events ()
+  "Boundary: events that don't pass the day-wide filter contribute nothing."
+  (let* ((base (test-time-now))
+         (future (test-time-tomorrow-at 9 0))
+         (ts (test-timestamp-string future))
+         (event (chime--make-event (list (cons ts future))
+                                   "Future Timed"
+                                   '((10 . medium))))
+         (chime-day-wide-advance-notice nil)
+         (chime-show-any-overdue-with-day-wide-alerts t))
+    (with-test-time base
+      (should (null (chime--day-wide-notifications (list event)))))))
+
+(provide 'test-chime-day-wide-notifications)
+;;; test-chime-day-wide-notifications.el ends here