Stundenplan: Wochenraster, Wochennavigation, Ferien/Feiertage (Kapitel 4.3)

Neuer Stundenplan mit "Heute"-Standardansicht (Tagesliste unten angedockt,
gruppenübergreifendes Wochenraster mit Fach/Klasse/Raum/Thema, Vor-/Zurück-
Navigation zwischen Kalenderwochen) und separatem Bearbeiten-Raster für die
wöchentliche Zuordnung. Badges für Ferien-/Klausur-Nähe und ausgegraute
Ferientage direkt im Plan statt einer separaten Liste. Ferien-/Feiertage-
Pflege (Bundesland, Schulferien) sitzt jetzt in den Einstellungen statt im
Stundenplan selbst.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

LehrerApp.Tests/PublicHolidayServiceTests.cs

@@ -0,0 +1,67 @@
+using LehrerApp.Core.Models;
+using LehrerApp.Core.Services;
+using Xunit;
+
+namespace LehrerApp.Tests;
+
+public sealed class PublicHolidayServiceTests
+{
+    private readonly PublicHolidayService _service = new();
+
+    [Theory]
+    [InlineData(2023, "2023-04-09")]
+    [InlineData(2024, "2024-03-31")]
+    [InlineData(2025, "2025-04-20")]
+    [InlineData(2026, "2026-04-05")]
+    [InlineData(2027, "2027-03-28")]
+    public void GetHolidays_Ostermontag_LiegtEinenTagNachDemBekanntenOstersonntag(int year, string easterSundayIso)
+    {
+        var easterSunday = DateOnly.Parse(easterSundayIso);
+        var holidays = _service.GetHolidays(year, GermanState.NW);
+
+        Assert.Contains(holidays, h => h.Name == "Ostermontag" && h.Date == easterSunday.AddDays(1));
+        Assert.Contains(holidays, h => h.Name == "Karfreitag" && h.Date == easterSunday.AddDays(-2));
+    }
+
+    [Fact]
+    public void GetHolidays_AlleBundeslaender_EnthaltenDieBundesweitenFeiertage()
+    {
+        foreach (var state in Enum.GetValues<GermanState>())
+        {
+            var holidays = _service.GetHolidays(2026, state);
+            Assert.Contains(holidays, h => h.Date == new DateOnly(2026, 1, 1));   // Neujahr
+            Assert.Contains(holidays, h => h.Date == new DateOnly(2026, 5, 1));   // Tag der Arbeit
+            Assert.Contains(holidays, h => h.Date == new DateOnly(2026, 10, 3));  // Tag der Deutschen Einheit
+            Assert.Contains(holidays, h => h.Date == new DateOnly(2026, 12, 25));
+            Assert.Contains(holidays, h => h.Date == new DateOnly(2026, 12, 26));
+        }
+    }
+
+    [Fact]
+    public void GetHolidays_Fronleichnam_NurInDenZustaendigenBundeslaendern()
+    {
+        var nrw = _service.GetHolidays(2026, GermanState.NW);
+        var berlin = _service.GetHolidays(2026, GermanState.BE);
+
+        Assert.Contains(nrw, h => h.Name == "Fronleichnam");
+        Assert.DoesNotContain(berlin, h => h.Name == "Fronleichnam");
+    }
+
+    [Fact]
+    public void GetHolidays_Reformationstag_NurInDenZustaendigenBundeslaendern()
+    {
+        var sachsen = _service.GetHolidays(2026, GermanState.SN);
+        var bayern = _service.GetHolidays(2026, GermanState.BY);
+
+        Assert.Contains(sachsen, h => h.Name == "Reformationstag");
+        Assert.DoesNotContain(bayern, h => h.Name == "Reformationstag");
+    }
+
+    [Fact]
+    public void GetHolidays_SindNachDatumSortiert()
+    {
+        var holidays = _service.GetHolidays(2026, GermanState.BY);
+
+        Assert.Equal(holidays.OrderBy(h => h.Date).Select(h => h.Date), holidays.Select(h => h.Date));
+    }
+}

LehrerApp.Tests/SchoolCalendarSettingsServiceTests.cs

@@ -0,0 +1,37 @@
+using LehrerApp.Core.Models;
+using LehrerApp.Core.Services;
+using Xunit;
+
+namespace LehrerApp.Tests;
+
+public sealed class SchoolCalendarSettingsServiceTests
+{
+    [Fact]
+    public void NeueKonfiguration_HatNordrheinWestfalenAlsStandard()
+    {
+        using var temp = new TempAppData();
+        var service = new SchoolCalendarSettingsService(temp.Path);
+
+        Assert.Equal(GermanState.NW, service.State);
+    }
+
+    [Fact]
+    public void SetState_WirdUeberNeueInstanzHinwegPersistiert()
+    {
+        using var temp = new TempAppData();
+        new SchoolCalendarSettingsService(temp.Path).SetState(GermanState.BY);
+
+        var second = new SchoolCalendarSettingsService(temp.Path);
+
+        Assert.Equal(GermanState.BY, second.State);
+    }
+
+    private sealed class TempAppData : IDisposable
+    {
+        public string Path { get; } = System.IO.Path.Combine(
+            System.IO.Path.GetTempPath(), $"lehrerapp-schoolcal-tests-{Guid.NewGuid():N}");
+
+        public TempAppData() => Directory.CreateDirectory(Path);
+        public void Dispose() { if (Directory.Exists(Path)) Directory.Delete(Path, recursive: true); }
+    }
+}