fix(ui): drop stale delta refreshes so the newest task state wins

2026-08-07 09:18:52 +02:00
parent cba7d01c31
commit ac099dd1a8
2 changed files with 41 additions and 3 deletions
@@ -122,4 +122,32 @@ public class TasksIslandDeltaResilienceTests : IDisposable

        Assert.Equal(TaskStatus.Running, vm.Items.Single(r => r.Id == "T1").Status);
    }
+
+    [Fact]
+    public async Task A_stale_delta_result_does_not_overwrite_a_newer_one()
+    {
+        await SeedAsync();
+
+        var factory = new FlakyDbFactory(NewContext, failuresLeft: 0);
+        var vm = new TasksIslandViewModel(factory, new FakeWorker());
+        var list = UserList("L1", "Work");
+        await LoadAndWaitAsync(vm, list);
+
+        // Start refresh #1 while the DB still says Queued, but do not await it yet.
+        var first = vm.RefreshTaskFromWorkerAsync("T1");
+
+        await using (var db = NewContext())
+        {
+            var t = await db.Tasks.FirstAsync(x => x.Id == "T1");
+            t.Status = TaskStatus.Running;
+            await db.SaveChangesAsync();
+        }
+
+        // Refresh #2 sees Running and must win, regardless of completion order.
+        var second = vm.RefreshTaskFromWorkerAsync("T1");
+
+        await Task.WhenAll(first, second);
+
+        Assert.Equal(TaskStatus.Running, vm.Items.Single(r => r.Id == "T1").Status);
+    }
 }