Use VisibleForTesting(otherwise = PROTECTED).

Author: vbabanin

driver-core/src/main/com/mongodb/internal/connection/BaseCluster.java

@@ -69,6 +69,7 @@
 import static com.mongodb.internal.Locks.withInterruptibleLock;
 import static com.mongodb.internal.VisibleForTesting.AccessModifier.PACKAGE;
 import static com.mongodb.internal.VisibleForTesting.AccessModifier.PRIVATE;
+import static com.mongodb.internal.VisibleForTesting.AccessModifier.PROTECTED;
 import static com.mongodb.internal.connection.EventHelper.wouldDescriptionsGenerateEquivalentEvents;
 import static com.mongodb.internal.event.EventListenerHelper.singleClusterListener;
 import static com.mongodb.internal.logging.LogMessage.Component.SERVER_SELECTION;
@@ -95,7 +96,7 @@
 import static java.util.concurrent.TimeUnit.NANOSECONDS;
 import static java.util.stream.Collectors.toList;
 
-@VisibleForTesting(otherwise = PRIVATE)
+@VisibleForTesting(otherwise = PROTECTED)
 public abstract class BaseCluster implements Cluster {
     private static final Logger LOGGER = Loggers.getLogger("cluster");
     private static final StructuredLogger STRUCTURED_LOGGER = new StructuredLogger("cluster");