diff --git a/OpenNest.Server.Tests/NestHistoryClientTests.cs b/OpenNest.Server.Tests/NestHistoryClientTests.cs
new file mode 100644
index 00000000..559eaaa5
--- /dev/null
+++ b/OpenNest.Server.Tests/NestHistoryClientTests.cs
@@ -0,0 +1,48 @@
+using System.Net;
+using OpenNest.Data;
+
+namespace OpenNest.Server.Tests;
+
+public sealed class NestHistoryClientTests
+{
+    [Fact]
+    public async Task RealClient_CreatesAndUpdatesOneNestWithExactHistoricalArchives()
+    {
+        using var factory = new ServerFactory();
+        using var http = factory.CreateClient();
+        using var repository = new RemoteNestRepository(http, http.BaseAddress!.ToString());
+        var id = Guid.NewGuid();
+        var first = new byte[] { 80, 75, 0, 1, 255 };
+        var second = new byte[] { 80, 75, 0, 2, 254 };
+        var created = await repository.UploadAsync(first, new NestRecord { Id = id, Name = "Synthetic" });
+        Assert.Equal(1, created.Revision);
+
+        var updated = await repository.UpdateFileAsync(id, second, new NestRecord { Id = id, Name = "Synthetic two" }, 1);
+        Assert.Equal(2, updated.Revision);
+        var page = await repository.GetRevisionsAsync(id, limit: 1);
+        Assert.Equal(2, page.Total);
+        Assert.Equal(2, Assert.Single(page.Items).Revision);
+        Assert.Equal("Synthetic", Assert.Single((await repository.GetRevisionsAsync(id, offset: 1, limit: 1)).Items).Name);
+        Assert.Equal(first, await repository.GetRevisionFileAsync(id, 1));
+        Assert.Equal(second, await repository.GetRevisionFileAsync(id, 2));
+        Assert.Equal(second, await repository.GetFileAsync(id));
+
+        var conflict = await Assert.ThrowsAsync<IOException>(() =>
+            repository.UpdateFileAsync(id, first, created, 1));
+        Assert.Contains("409", conflict.Message);
+        Assert.Equal(2, (await repository.GetRevisionsAsync(id, limit: 1)).Total);
+        Assert.Equal(second, await repository.GetFileAsync(id));
+    }
+
+    [Fact]
+    public async Task LegacyUnguardedDelete_IsRefusedWithoutMutation()
+    {
+        using var factory = new ServerFactory();
+        using var http = factory.CreateClient();
+        using var repository = new RemoteNestRepository(http, http.BaseAddress!.ToString());
+        var created = await repository.UploadAsync([1, 2, 3], new NestRecord { Name = "Synthetic" });
+        using var response = await http.DeleteAsync($"/api/nests/{created.Id}");
+        Assert.Equal((HttpStatusCode)428, response.StatusCode);
+        Assert.Equal(new byte[] { 1, 2, 3 }, await repository.GetRevisionFileAsync(created.Id, 1));
+    }
+}