Tests: ensure restoration of replication after pub/sub failure we know about

StackExchange.Redis.Tests/PubSubNonParallel.cs

@@ -39,6 +39,8 @@ public async Task SubscriptionsSurviveMasterSwitchAsync(bool useSharedSocketMana
         {
             using (var a = Create(allowAdmin: true, useSharedSocketManager: useSharedSocketManager))
             using (var b = Create(allowAdmin: true, useSharedSocketManager: useSharedSocketManager))
+            {
+                try
                 {
                     // Ensure config setup
                     await EnsureMasterSlaveSetupAsync(a).ForAwait();
@@ -141,6 +143,12 @@ public async Task SubscriptionsSurviveMasterSwitchAsync(bool useSharedSocketMana
                         catch { }
                     }
                 }
+                finally
+                {
+                    // Put it back, even if we fail...
+                    await EnsureMasterSlaveSetupAsync(a);
+                }
+            }
         }
     }
 }