ki Backend fix - Answer Size

LehrerApp.Desktop.Tests/AiPlanningServiceTests.cs

@@ -82,6 +82,23 @@ public sealed class AiPlanningServiceTests
         Assert.Equal("DIE ORIGINALANTWORT", error.RawResponse);
     }
 
+    [Fact]
+    public async Task RequestPlanAsync_Zeitueberschreitung_LiefertKonkreteProxyMeldung()
+    {
+        var http = new HttpClient(new CanceledResponseHandler())
+        {
+            BaseAddress = new Uri("https://example.invalid/"),
+        };
+        var service = new AiPlanningService(http, new FakeLessons(), new FakeGroups([]), new FakeSubjects([]),
+            new FakeCompetencyDomains(), new FakeAlternativeLessonPaths([]));
+
+        var error = await Assert.ThrowsAsync<AiBackendException>(() =>
+            service.RequestPlanAsync(new Unit(), "", "token"));
+
+        Assert.Contains("3½ Minuten", error.Message);
+        Assert.Contains("Webserver-Proxys", error.Message);
+    }
+
     [Fact]
     public void Rettungsdialog_ImportiertMarkierteStundeAlsNeu()
     {
@@ -118,6 +135,13 @@ public sealed class AiPlanningServiceTests
         });
     }
 
+    private sealed class CanceledResponseHandler : HttpMessageHandler
+    {
+        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request,
+            CancellationToken cancellationToken) => Task.FromCanceled<HttpResponseMessage>(
+                new CancellationToken(canceled: true));
+    }
+
     [Fact]
     public void BuildContext_FuelltGruppenUndFachKontext()
     {