enforce no parallelization

build.fsx

@@ -135,7 +135,9 @@ Target "RunTests" <| fun _ ->
     printfn "Using XUnit runner: %s" xunitToolPath
     xUnit2
         (fun p -> { p with HtmlOutputPath = Some(testOutput @@ "xunit.html")
-                           ForceTeamCity = true })
+                           Parallel = NoParallelization
+                           ForceTeamCity = true 
+                           })
         xunitTestAssemblies
 
 Target "PrepAppConfig" <| fun _ ->

src/Akka.Persistence.Cassandra.Tests/app.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
   <appSettings>
-    <add key="cassandraContactPoint" value="" />
+    <add key="cassandraContactPoint" value="127.0.0.1" />
   </appSettings>
 </configuration>