Migrate.Basic... you're nothing but trouble

StackExchange.Redis.Tests/Migrate.cs

 using System.Linq;
+using System.Threading.Tasks;
 using Xunit;
 using Xunit.Abstractions;
 
@@ -9,7 +10,7 @@ public class Migrate : TestBase
         public Migrate(ITestOutputHelper output) : base (output) { }
 
         [Fact]
-        public void Basic()
+        public async Task Basic()
         {
             var fromConfig = new ConfigurationOptions { EndPoints = { { TestConfig.Current.SecureServer, TestConfig.Current.SecurePort } }, Password = TestConfig.Current.SecurePassword };
             var toConfig = new ConfigurationOptions { EndPoints = { { TestConfig.Current.MasterServer, TestConfig.Current.MasterPort } } };
@@ -24,6 +25,10 @@ public void Basic()
                 fromDb.StringSet(key, "foo", flags: CommandFlags.FireAndForget);
                 var dest = to.GetEndPoints(true).Single();
                 fromDb.KeyMigrate(key, dest);
+                await Task.Delay(1000); // this is *meant* to be synchronous at the redis level, but
+                // we keep seeing it fail on the CI server where the key has *left* the origin, but
+                // has *not* yet arrived at the destination; adding a pause while we investigate with
+                // the redis folks
                 Assert.False(fromDb.KeyExists(key));
                 Assert.True(toDb.KeyExists(key));
                 string s = toDb.StringGet(key);