Switch to the official NUnit package. Disable Moq-based tests for now.

StackExchange.Redis.Tests/BatchWrapperTests.cs

-using System;
+#if FEATURE_MOQ
+using System;
 using Moq;
 using NUnit.Framework;
 using StackExchange.Redis.KeyspaceIsolation;
@@ -28,3 +29,4 @@ public void Execute()
         }
     }
 }
+#endif
\ No newline at end of file

StackExchange.Redis.Tests/DatabaseWrapperTests.cs

-using System;
+#if FEATURE_MOQ
+using System;
 using System.Collections.Generic;
 using System.Linq.Expressions;
 using System.Net;
@@ -933,3 +934,4 @@ public void StringSetRange()
         }
     }
 }
+#endif
\ No newline at end of file

StackExchange.Redis.Tests/TransactionWrapperTests.cs

-using System.Text;
+#if FEATURE_MOQ
+using System.Text;
 using Moq;
 using NUnit.Framework;
 using StackExchange.Redis.KeyspaceIsolation;
@@ -90,3 +91,4 @@ public void Execute()
         }
     }
 }
+#endif
\ No newline at end of file

StackExchange.Redis.Tests/WrapperBaseTests.cs

-using System;
+#if FEATURE_MOQ
+using System;
 using System.Collections.Generic;
 using System.Linq.Expressions;
 using System.Net;
@@ -890,3 +891,4 @@ public void StringSetRangeAsync()
         }
     }
 }
+#endif
\ No newline at end of file

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

@@ -30,9 +30,8 @@
         "System.Reflection.Extensions": "4.0.1-beta-*",
         "System.Threading.Tasks.Parallel": "4.0.1-beta-*",
         "Microsoft.CSharp": "4.0.0-beta-*",
-        "moq.netcore": "4.4.0",
-        "nunit": "3.0.1-beta-5",
-        "nunitlite": "3.0.1-beta-5"
+        "nunit": "3.0.0-rc-2",
+        "nunitlite": "3.0.0-rc-2"
       }
     }
   }