Baustein 2: Outbound-Hook-Infrastruktur (Kapitel 10)

LiteDbContext.OnChange-Hook (Sync-agnostisch, kein Verweis auf LehrerApp.Sync aus LehrerApp.Data), damit Repositories lokale Schreibvorgaenge signalisieren koennen, ohne dass Data von Sync abhaengt. StudentRepository als Vorlage verdrahtet. GroupRepository.Delete-Kaskade (14 betroffene Collections) nach LiteDbContext.CascadeDeleteGroup extrahiert - reine Verschiebung, kein Verhaltensunterschied, macht sie aber von einem spaeter eingehenden Sync-Ereignis (Baustein 5) wiederverwendbar, ohne ueber Repository-Save/Delete (und damit erneut ueber OnChange) zu laufen. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-08-17 11:20:30 +02:00
parent 6f9de325d5
commit 831cc1c16c
3 changed files with 157 additions and 72 deletions
@@ -0,0 +1,60 @@
+using LehrerApp.Core.Models;
+using LehrerApp.Data.Repositories;
+using Xunit;
+
+namespace LehrerApp.Data.Tests;
+
+// Vorlage-Test für den OnChange-Hook (Baustein 2), den die übrigen Repositories in den
+// Bausteinen 3/4 auf dieselbe Weise bekommen.
+public sealed class ChangeHookTests
+{
+    private static LiteDbContext NewInMemoryContext() => new(new MemoryStream());
+
+    [Fact]
+    public void StudentRepository_Save_LoestOnChangeMitKorrektenArgumentenAus()
+    {
+        using var db = NewInMemoryContext();
+        var calls = new List<(string EntityType, string EntityId, string Operation, object? Payload)>();
+        db.OnChange = (type, id, op, payload) => calls.Add((type, id, op, payload));
+        var repo = new StudentRepository(db);
+        var student = new Student { FirstName = "Anna", LastName = "Beispiel" };
+
+        repo.Save(student);
+
+        var call = Assert.Single(calls);
+        Assert.Equal("Student", call.EntityType);
+        Assert.Equal(student.Id.ToString(), call.EntityId);
+        Assert.Equal("Save", call.Operation);
+        Assert.Same(student, call.Payload);
+    }
+
+    [Fact]
+    public void StudentRepository_Delete_LoestOnChangeMitNullPayloadAus()
+    {
+        using var db = NewInMemoryContext();
+        var repo = new StudentRepository(db);
+        var student = new Student { FirstName = "Anna", LastName = "Beispiel" };
+        repo.Save(student);
+        var calls = new List<(string EntityType, string EntityId, string Operation, object? Payload)>();
+        db.OnChange = (type, id, op, payload) => calls.Add((type, id, op, payload));
+
+        repo.Delete(student.Id);
+
+        var call = Assert.Single(calls);
+        Assert.Equal("Student", call.EntityType);
+        Assert.Equal(student.Id.ToString(), call.EntityId);
+        Assert.Equal("Delete", call.Operation);
+        Assert.Null(call.Payload);
+    }
+
+    [Fact]
+    public void StudentRepository_Save_OhneGesetztenHook_WirftNicht()
+    {
+        using var db = NewInMemoryContext();
+        var repo = new StudentRepository(db);
+
+        var exception = Record.Exception(() => repo.Save(new Student { FirstName = "Anna", LastName = "Beispiel" }));
+
+        Assert.Null(exception);
+    }
+}