Add home hero with intro and buttons from the body, next-event card and page tiles

Elternbeirat.Web.Tests/UpcomingEventsTests.cs

@@ -0,0 +1,45 @@
+using Elternbeirat.Contracts;
+using Elternbeirat.Web.Features.Events;
+using Elternbeirat.Web.Shared;
+
+namespace Elternbeirat.Web.Tests;
+
+/// <summary>
+/// Unit tests for the "what is coming up?" rule and the Berlin day behind it. Pure
+/// logic, no PocketBase needed.
+/// </summary>
+public class UpcomingEventsTests
+{
+    private static Event Event(string title, DateTime start) =>
+        new() { Id = "test", Title = title, Start = start };
+
+    [Fact]
+    public void Keeps_today_and_later_ordered_by_start()
+    {
+        var events = new[]
+        {
+            Event("Basar", new DateTime(2026, 11, 22, 9, 0, 0)),
+            Event("Gestern", new DateTime(2026, 9, 30, 19, 30, 0)),
+            Event("Heute früh", new DateTime(2026, 10, 1, 7, 0, 0)), // already begun, still today
+            Event("Sitzung", new DateTime(2026, 10, 8, 19, 30, 0)),
+        };
+
+        var upcoming = UpcomingEvents.From(events, new DateOnly(2026, 10, 1));
+
+        upcoming.Select(@event => @event.Title).ShouldBe(["Heute früh", "Sitzung", "Basar"]);
+    }
+
+    [Fact]
+    public void Nothing_upcoming_gives_an_empty_list() =>
+        UpcomingEvents.From([Event("Vorbei", new DateTime(2026, 1, 1))], new DateOnly(2026, 10, 1))
+            .ShouldBeEmpty();
+
+    [Fact]
+    public void Berlin_day_starts_before_the_UTC_day()
+    {
+        // 22:30 UTC on 30 September is 00:30 on 1 October in Berlin (summer time).
+        var time = new FixedTimeProvider(new DateTimeOffset(2026, 9, 30, 22, 30, 0, TimeSpan.Zero));
+
+        BerlinClock.Today(time).ShouldBe(new DateOnly(2026, 10, 1));
+    }
+}