diff --git a/tests/GameCult.Caching.Tests/VariantTests.cs b/tests/GameCult.Caching.Tests/VariantTests.cs
index 62255b12..8f574cd1 100644
--- a/tests/GameCult.Caching.Tests/VariantTests.cs
+++ b/tests/GameCult.Caching.Tests/VariantTests.cs
@@ -418,7 +418,7 @@ namespace GameCult.Caching.Tests
         [Test]
         public void ACacheWithoutACodecHoldsNoVariants()
         {
-            using var cache = new CultCache(Registry, CultCacheMessagePack.CreateCodec(Registry));
+            using var cache = new CultCache(Registry);
             cache.Commit(batch => batch.Upsert(typeof(VariantGear), Laser(), BaseKey));
             var error = Refused(() => cache.UpsertVariantAsync(BigKey, BaseKey).GetAwaiter().GetResult());
             Assert.That(error.Message, Does.Contain(BigKey.Value).And.Contain("codec"));
diff --git a/tests/GameCult.Caching.Tests/WriteOwnershipTests.cs b/tests/GameCult.Caching.Tests/WriteOwnershipTests.cs
index ff975a51..0728e6f1 100644
--- a/tests/GameCult.Caching.Tests/WriteOwnershipTests.cs
+++ b/tests/GameCult.Caching.Tests/WriteOwnershipTests.cs
@@ -265,8 +265,9 @@ namespace GameCult.Caching.Tests
                 Assert.That(cache.Commit(batch =>
                 {
                     batch.Remove(K2);
+                    batch.Upsert(new WoB { Name = "k2", Value = 8 }, new CultRecordHandle<WoB>(K2));
                     batch.Upsert(new WoA { Name = "k2", Value = 9 }, new CultRecordHandle<WoA>(K2));
-                }), Is.True);
+                }), Is.True, "the key stays a replacement through a later add of the same batch");
                 Assert.That(cache.GetStored(K2)!.Descriptor.DocumentType, Is.EqualTo(typeof(WoA)));
             }