chore: code cleanup

tests/Config/BookingHorizonTest.php

@@ -0,0 +1,50 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Tests\Config;
+
+use App\Config\BookingHorizon;
+use PHPUnit\Framework\TestCase;
+
+class BookingHorizonTest extends TestCase
+{
+    public function testTheHorizonIsThreeMonthsFromTheGivenDay(): void
+    {
+        self::assertSame(
+            '2026-12-14',
+            BookingHorizon::latest(new \DateTimeImmutable('2026-09-14'))->format('Y-m-d'),
+        );
+    }
+
+    /**
+     * PHP's "+3 months" from a 31st overflows into the next month (31 November does not exist,
+     * so it becomes 1 December). Pinned rather than clamped: this is a cap, and one extra day of
+     * horizon four times a year is not worth the arithmetic it would take to remove. The
+     * recurrence code deliberately avoids months for exactly this reason -- see
+     * RecurrenceRule::intervalDays() -- but a single boundary can live with it.
+     */
+    public function testAMonthEndOverflowsByADayAndThatIsAccepted(): void
+    {
+        self::assertSame(
+            '2026-12-01',
+            BookingHorizon::latest(new \DateTimeImmutable('2026-08-31'))->format('Y-m-d'),
+        );
+    }
+
+    public function testTheTimePartIsDroppedSoTheComparisonIsPerDay(): void
+    {
+        self::assertSame(
+            '00:00:00',
+            BookingHorizon::latest(new \DateTimeImmutable('2026-09-14 17:42:13'))->format('H:i:s'),
+        );
+    }
+
+    public function testItDefaultsToToday(): void
+    {
+        self::assertEquals(
+            BookingHorizon::latest(new \DateTimeImmutable('today')),
+            BookingHorizon::latest(),
+        );
+    }
+}