public FlowLogSpec(ITestOutputHelper helper) : base("akka.loglevel = DEBUG", helper)
{
var settings = ActorMaterializerSettings.Create(Sys).WithInputBuffer(2, 16);
Materializer = ActorMaterializer.Create(Sys, settings);
var p = CreateTestProbe();
Sys.EventStream.Subscribe(p.Ref, typeof(object));
LogProbe = p;
}