fix: read one-sided booking times as "ab" and "bis"

tests/Model/SpotTest.php

@@ -42,7 +42,7 @@ class SpotTest extends TestCase
         // Taken 09:00-13:00 leaves 00:00-09:00 (9h) and 13:00-24:00 (11h).
         $spot = $this->spot([$this->booking($this->someoneElse(), 540, 780)]);
 
-        self::assertSame('13:00–24:00', (string) $spot->suggested());
+        self::assertSame('ab 13:00', (string) $spot->suggested());
     }
 
     public function testTheSuggestedWindowIsAlwaysBookable(): void

tests/Model/TimeRangeTest.php

@@ -149,6 +149,14 @@ class TimeRangeTest extends TestCase
         self::assertSame('yes', $twig->render('t', ['range' => TimeRange::wholeDay()]));
     }
 
+    public function testAOneSidedRangeReadsAsAbOrBis(): void
+    {
+        self::assertSame('bis 13:00', (string) TimeRange::fromMinutes(TimeRange::DAY_START, 13 * 60));
+        self::assertSame('ab 13:00', (string) TimeRange::fromMinutes(13 * 60, TimeRange::DAY_END));
+        self::assertSame('09:00–13:00', (string) TimeRange::fromMinutes(9 * 60, 13 * 60));
+        self::assertSame('ganztägig', (string) TimeRange::wholeDay());
+    }
+
     /**
      * @param list<TimeRange> $ranges
      *