Tests: move SubscriptionsSurviveConnectionFailure to async

StackExchange.Redis.Tests/PubSub.cs

@@ -254,29 +254,31 @@ public void TestPatternPubSub(bool preserveOrder)
 
 #if DEBUG
         [Fact]
-        public void SubscriptionsSurviveConnectionFailure()
+        public async Task SubscriptionsSurviveConnectionFailureAsync()
         {
             using (var muxer = Create(allowAdmin: true))
             {
                 RedisChannel channel = Me();
                 var sub = muxer.GetSubscriber();
                 int counter = 0;
-                sub.Subscribe(channel, delegate
+                await sub.SubscribeAsync(channel, delegate
                 {
                     Interlocked.Increment(ref counter);
-                });
-                sub.Publish(channel, "abc");
+                }).ConfigureAwait(false);
+                await sub.PublishAsync(channel, "abc").ConfigureAwait(false);
                 sub.Ping();
+                await Task.Delay(200).ConfigureAwait(false);
                 Assert.Equal(1, VolatileWrapper.Read(ref counter));
                 var server = GetServer(muxer);
                 Assert.Equal(1, server.GetCounters().Subscription.SocketCount);
 
                 server.SimulateConnectionFailure();
                 SetExpectedAmbientFailureCount(2);
-                Thread.Sleep(100);
+                await Task.Delay(200).ConfigureAwait(false);
                 sub.Ping();
                 Assert.Equal(2, server.GetCounters().Subscription.SocketCount);
-                sub.Publish(channel, "abc");
+                await sub.PublishAsync(channel, "abc").ConfigureAwait(false);
+                await Task.Delay(200).ConfigureAwait(false);
                 sub.Ping();
                 Assert.Equal(2, VolatileWrapper.Read(ref counter));
             }