don't penalize us for reporting more than one way of failing

StackExchange.Redis.Tests/ConnectionFailedErrors.cs

 using System;
+using System.Linq;
 using System.Security.Authentication;
 using System.Threading;
 using System.Threading.Tasks;
@@ -104,6 +105,12 @@ public void SocketFailureError()
             {
                 Assert.Equal(ConnectionFailureType.UnableToConnect, rce.FailureType);
             }
+            else if (outer.InnerException is AggregateException ae
+                && ae.InnerExceptions.Any(e => e is RedisConnectionException rce2
+                && rce2.FailureType == ConnectionFailureType.UnableToConnect))
+            {
+                // fine; at least *one* of them is the one we were hoping to see
+            }
             else
             {
                 Writer.WriteLine(outer.InnerException.ToString());