diff --git a/src/DynamicData.Tests/Cache/MergeManyChangeSetsCacheFixture.cs b/src/DynamicData.Tests/Cache/MergeManyChangeSetsCacheFixture.cs
index 37ca6b19..949ec35b 100644
--- a/src/DynamicData.Tests/Cache/MergeManyChangeSetsCacheFixture.cs
+++ b/src/DynamicData.Tests/Cache/MergeManyChangeSetsCacheFixture.cs
@@ -5,6 +5,7 @@
 using System.Reactive.Concurrency;
 using System.Reactive.Disposables;
 using System.Reactive.Linq;
+using System.Reactive.Threading.Tasks;
 using System.Threading.Tasks;
 using Bogus;
 using DynamicData.Kernel;
@@ -90,10 +91,11 @@ IObservable<MarketPrice> AddRemovePrices(Market market, int priceCount, int para
                 .Parallelize(priceCount, parallel, obs => obs.StressAddRemove(market.PricesCache, _ => GetRemoveTime(), scheduler))
                 .Finally(market.PricesCache.Dispose);
 
-        var merged = _marketCache.Connect().MergeManyChangeSets(market => market.LatestPrices);
-        using var priceResults = merged.AsAggregator();
-
+        var merged = _marketCache.Connect().MergeManyChangeSets(market => market.LatestPrices).Publish();
         var adding = true;
+        var cacheCompleted = merged.LastOrDefaultAsync().ToTask();
+        using var priceResults = merged.AsAggregator();
+        using var connect = merged.Connect();
 
         // Start asynchrononously modifying the parent list and the child lists
         using var addingSub = AddRemoveStress(marketCount, priceCount, Environment.ProcessorCount, TaskPoolScheduler.Default)
@@ -119,6 +121,9 @@ IObservable<MarketPrice> AddRemovePrices(Market market, int priceCount, int para
         }
         while (adding);
 
+        // Wait for the source cache to finish delivering all notifications.
+        await cacheCompleted;
+
         // Verify the results
         CheckResultContents(_marketCacheResults, priceResults);
     }
diff --git a/src/DynamicData.Tests/Cache/MergeManyChangeSetsListFixture.cs b/src/DynamicData.Tests/Cache/MergeManyChangeSetsListFixture.cs
index f7a4aa2a..49f56690 100644
--- a/src/DynamicData.Tests/Cache/MergeManyChangeSetsListFixture.cs
+++ b/src/DynamicData.Tests/Cache/MergeManyChangeSetsListFixture.cs
@@ -5,6 +5,7 @@
 using System.Reactive.Concurrency;
 using System.Reactive.Disposables;
 using System.Reactive.Linq;
+using System.Reactive.Threading.Tasks;
 using System.Threading.Tasks;
 using Bogus;
 using DynamicData.Kernel;
@@ -86,9 +87,11 @@ IObservable<Animal> AddRemoveAnimals(AnimalOwner owner, int animalCount, int par
                 .Parallelize(animalCount, parallel, obs => obs.StressAddRemove(owner.Animals, _ => GetRemoveTime(), scheduler))
                 .Finally(owner.Animals.Dispose);
 
-        var mergeAnimals = _animalOwners.Connect().MergeManyChangeSets(owner => owner.Animals.Connect());
-
+        var mergeAnimals = _animalOwners.Connect().MergeManyChangeSets(owner => owner.Animals.Connect()).Publish();
         var addingAnimals = true;
+        var cacheCompleted = mergeAnimals.LastOrDefaultAsync().ToTask();
+        using var animalResults = mergeAnimals.AsAggregator();
+        using var connect = mergeAnimals.Connect();
 
         // Start asynchrononously modifying the parent list and the child lists
         using var addAnimals = AddRemoveAnimalsStress(ownerCount, animalCount, Environment.ProcessorCount, TaskPoolScheduler.Default)
@@ -114,8 +117,12 @@ IObservable<Animal> AddRemoveAnimals(AnimalOwner owner, int animalCount, int par
         }
         while (addingAnimals);
 
-        // Verify the results
-        CheckResultContents();
+        // Wait for the source cache to finish delivering all notifications.
+        await cacheCompleted;
+
+        // Verify the results against the aggregator wired into the same Publish chain
+        // that cacheCompleted observes.
+        CheckResultContents(_animalOwners.Items, _animalOwnerResults, animalResults);
     }
 
     [Fact]