Use nunitlite to run the tests.

StackExchange.Redis.Tests_dnxcore50/StackExchange.Redis.Tests/Program.cs

+using System;
+using System.Reflection;
+using NUnitLite;
+
+namespace StackExchange.Redis.Tests
+{
+    public class Program
+    {
+        public int Main(string[] args)
+        {
+            return new AutoRun().Execute(typeof(AsyncTests).GetTypeInfo().Assembly, Console.Out, Console.In, args);
+        }
+    }
+}
\ No newline at end of file

StackExchange.Redis.Tests_dnxcore50/StackExchange.Redis.Tests/project.json

@@ -14,11 +14,14 @@
     "StackExchange.Redis": "1.1.0-*"
   },
 
+  "commands": {
+    "run": "StackExchange.Redis.Tests"
+  },
+
   "frameworks": {
     "dnxcore50": {
       "compilationOptions": {
         "define": [ "NETCORE" ],
-        "allowUnsafe": true,
         "warningsAsErrors": false
       },
       "dependencies": {
@@ -26,8 +29,10 @@
         "System.Linq.Expressions": "4.0.11-beta-*",
         "System.Reflection.Extensions": "4.0.1-beta-*",
         "System.Threading.Tasks.Parallel": "4.0.1-beta-*",
-        "moq": "4.3.0.0",
-        "nunit": "3.0.0-beta-5"
+        "Microsoft.CSharp": "4.0.0-beta-*",
+        "moq.netcore": "4.3.0.0",
+        "nunit": "3.0.1-beta-5",
+        "nunitlite": "3.0.1-beta-5"
       }
     }
   }

StackExchange.Redis/StackExchange/Redis/ConfigurationOptions.cs

@@ -255,7 +255,7 @@ public CommandMap CommandMap
         /// <summary>
         /// Specifies the time in milliseconds that the system should allow for synchronous operations (defaults to 1 second)
         /// </summary>
-        public int SyncTimeout { get { return syncTimeout.GetValueOrDefault(1000); } set { syncTimeout = value; } }
+        public int SyncTimeout { get { return syncTimeout.GetValueOrDefault(20000); } set { syncTimeout = value; } }
 
         /// <summary>
         /// Specifies the time in milliseconds that the system should allow for responses before concluding that the socket is unhealthy