[CS1998] ClusterHeartbeatReceiverSpec This async method lacks await operators (#6699)

Author: eaba

src/core/Akka.Cluster.Tests/ClusterHeartbeatReceiverSpec.cs

@@ -6,6 +6,7 @@
 //-----------------------------------------------------------------------
 
 using System;
+using System.Threading;
 using System.Threading.Tasks;
 using Akka.Actor;
 using Akka.Configuration;
@@ -58,8 +59,8 @@ public async Task ClusterHeartbeatReceiver_should_write_correct_debug_messages_o
         {
             var heartbeater = Sys.ActorOf(ClusterHeartbeatReceiver.Props(Cluster.Get(Sys)));
 
-            EventFilter.Debug(contains: "- Sequence number [2]")
-                .ExpectOne(() => heartbeater.Tell(new Heartbeat(Cluster.Get(Sys).SelfAddress, 2, 3)));
+            await EventFilter.Debug(contains: "- Sequence number [2]")
+                .ExpectOneAsync(() => { heartbeater.Tell(new Heartbeat(Cluster.Get(Sys).SelfAddress, 2, 3)); return Task.CompletedTask; });
         }
 
         [Fact]
@@ -68,8 +69,8 @@ public async Task ClusterHeartbeatSender_should_write_correct_debug_messages_on_
             var heartbeater = Sys.ActorOf(Props.Create(() => new ClusterHeartbeatSender(Cluster.Get(Sys))));
             heartbeater.Tell(new ClusterEvent.CurrentClusterState());
 
-            EventFilter.Debug(contains: "- Sequence number [2] - Creation time [00:00:03]")
-                .ExpectOne(() => heartbeater.Tell(new HeartbeatRsp(Cluster.Get(Sys).SelfUniqueAddress, 2, 3000000000)));
+            await EventFilter.Debug(contains: "- Sequence number [2] - Creation time [00:00:03]")
+                .ExpectOneAsync(() => { heartbeater.Tell(new HeartbeatRsp(Cluster.Get(Sys).SelfUniqueAddress, 2, 3000000000)); return Task.CompletedTask; });
         }
     }
 }