Added test case for DST taking place

Author: axunonb

Ical.Net.Tests/MatchTimeZoneTests.cs

@@ -58,19 +58,21 @@ public void MatchTimeZone_LocalTimeUsaWithTimeZone()
     }
 
     [Test, Category("Recurrence")]
-    public void MatchTimeZone_LocalTimeAustraliaWithTimeZone()
+    [TestCase("20241005T140000Z", 5)]
+    [TestCase("20241005T150000Z", 6)]
+    public void MatchTimeZone_LocalTimeAustraliaWithTimeZone(string inputUntil, int expectedOccurrences)
     {
         // DTSTART with local time and time zone reference (positive offset), UNTIL as UTC
-        const string ical =
-            """
+        var ical =
+           $"""
             BEGIN:VCALENDAR
             VERSION:2.0
             PRODID:-//Example Corp//NONSGML Event//EN
             BEGIN:VEVENT
             UID:example1
             SUMMARY:Event with local time and time zone
             DTSTART;TZID=Australia/Sydney:20241001T010000
-            RRULE:FREQ=DAILY;UNTIL=20241005T140000Z
+            RRULE:FREQ=DAILY;UNTIL={inputUntil}
             DTEND;TZID=Australia/Sydney:20241001T020000
             END:VEVENT
             END:VCALENDAR
@@ -80,23 +82,26 @@ public void MatchTimeZone_LocalTimeAustraliaWithTimeZone()
         var evt = calendar.Events.First();
         var until = evt.RecurrenceRules.First().Until;
 
-        var expectedUntil = new DateTime(2024, 10, 05, 14, 0, 0, DateTimeKind.Utc);
+        var expectedUntil = DateTime.ParseExact(inputUntil, "yyyyMMddTHHmmssZ",
+            System.Globalization.CultureInfo.InvariantCulture,
+            System.Globalization.DateTimeStyles.AssumeUniversal |
+            System.Globalization.DateTimeStyles.AdjustToUniversal);
         var occurrences = evt.GetOccurrences(new CalDateTime(2024, 10, 01), new CalDateTime(2024, 10, 07));
 
         Assert.Multiple(() =>
         {
             Assert.That(until, Is.EqualTo(expectedUntil));
-            Assert.That(occurrences.Count, Is.EqualTo(5));
+            Assert.That(occurrences.Count, Is.EqualTo(expectedOccurrences));
             /*
-               Should have 5 occurrences:
+               Should have 5 occurrences with UNTIL=20241005T140000Z...
                October 1, 2024: 01:00 AM - 02:00 AM (UTC+1000) (Australia/Sydney)
                October 2, 2024: 01:00 AM - 02:00 AM (UTC+1000) (Australia/Sydney)
                October 3, 2024: 01:00 AM - 02:00 AM (UTC+1000) (Australia/Sydney)
                October 4, 2024: 01:00 AM - 02:00 AM (UTC+1000) (Australia/Sydney)
                October 5, 2024: 01:00 AM - 02:00 AM (UTC+1000) (Australia/Sydney)
 
+               ... and 6 occurrences with UNTIL=20241005T150000Z, i.e. plus one more
                October 6, 2024: 01:00 AM - 02:00 AM (UTC+1100) (Australia/Sydney)
-               must NOT be included, because 20241005T140000Z => October 6, 2024: 01:00 AM (Australia/Sydney)
                (Daylight Saving Time in Australia/Sydney starts on Sunday, October 6, 2024, at 2:00 AM)
            */
         });