feat(usability): preserve reporting year and locate outside-period bookings (U04)

tests/Duempelkas.Tests/Duempelkas.Tests.csproj

@@ -8,6 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="bunit" Version="2.13.3" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.11.0" />
     <PackageReference Include="PdfPig" Version="0.1.16" />
     <PackageReference Include="xunit" Version="2.9.3" />

tests/Duempelkas.Tests/ReportingPeriodTests.cs

@@ -0,0 +1,19 @@
+using Duempelkas.App.Services;
+using Xunit;
+
+namespace Duempelkas.Tests;
+
+public class ReportingPeriodTests
+{
+    [Fact]
+    public void EmptyYearList_PreservesSelectedYear_AndOffersCurrentYear()
+    {
+        var period = new ReportingPeriod { Year = 2025 };
+        Assert.Contains(2025, period.Choices([]));
+        Assert.Contains(DateTime.Today.Year, period.Choices([]));
+        Assert.Equal("Jahr: 2025", period.Label);
+        period.Year = null;
+        Assert.Equal("Alle Jahre", period.Label);
+        Assert.Null(period.Year);
+    }
+}

tests/Duempelkas.Tests/YearNavigationTests.cs

@@ -0,0 +1,58 @@
+using Bunit;
+using Duempelkas.App.Components;
+using Duempelkas.App.Components.Dialogs;
+using Duempelkas.App.Services;
+using Duempelkas.Domain.Enums;
+using Duempelkas.Infrastructure;
+using Duempelkas.Infrastructure.Persistence;
+using Microsoft.Data.Sqlite;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+using Xunit;
+
+namespace Duempelkas.Tests;
+
+public class YearNavigationTests
+{
+    [Fact]
+    public async Task Navigation_PreservesYear_AndOutsideBookingOffersReturn()
+    {
+        using var context = new BunitContext();
+        var connectionString = $"Data Source=year-ui-{Guid.NewGuid():N};Mode=Memory;Cache=Shared";
+        using var anchor = new SqliteConnection(connectionString);
+        anchor.Open();
+        context.Services.AddInfrastructure(connectionString);
+        context.JSInterop.Mode = JSRuntimeMode.Loose;
+        using (var db = context.Services.GetRequiredService<IDbContextFactory<FinanceDbContext>>().CreateDbContext())
+        {
+            db.Database.EnsureCreated();
+            db.Accounts.Add(new() { Name = "Testkasse" });
+            db.SaveChanges();
+            await context.Services.GetRequiredService<IEntryService>().CreateEntryAsync(db.Accounts.Single().Id,
+                EntryType.Income, new(2025, 1, 1), "Vorjahr", 10m);
+        }
+        context.Services.GetRequiredService<ReportingPeriod>().Year = 2025;
+        var page = context.Render<Routes>();
+        page.WaitForAssertion(() => Assert.Contains("Jahr: 2025", page.Markup));
+        page.Find(".account-card").Click();
+        page.WaitForAssertion(() => Assert.Contains("Vorjahr", page.Markup));
+        page.FindAll("button").Single(b => b.TextContent.Contains("Zurück")).Click();
+        page.WaitForAssertion(() => Assert.Contains("Jahr: 2025", page.Markup));
+        page.Find(".account-card").Click();
+        page.WaitForElement(".summary-section");
+        page.FindAll("button").Single(b => b.TextContent.Trim() == "Buchung").Click();
+        var dialog = page.FindComponent<AddEntryDialog>();
+        dialog.Find("input[type=date]").Change("2026-01-02");
+        dialog.Find("input[type=text]").Change("Außerhalb");
+        dialog.Find("input[type=number]").Change("12.50");
+        Assert.Contains("außerhalb", dialog.Markup);
+        Assert.True(dialog.Find("button.btn-success").HasAttribute("disabled"));
+        dialog.Find("input[type=checkbox]").Change(true);
+        dialog.Find("button.btn-success").Click();
+        page.WaitForAssertion(() => Assert.Contains("Buchung im Jahr 2026 anzeigen", page.Markup));
+        Assert.DoesNotContain("Außerhalb", page.Find("table").TextContent);
+        page.FindAll("button").Single(b => b.TextContent.Contains("Buchung im Jahr 2026 anzeigen")).Click();
+        page.WaitForAssertion(() => Assert.Contains("Außerhalb", page.Find("table").TextContent));
+        Assert.Equal(2026, context.Services.GetRequiredService<ReportingPeriod>().Year);
+    }
+}