public void ExitLogsEventWithNullRequest()
 {
     EtwTracingHelper("Exit", new[] { "InvocationId", "ReturnValue" },
                      () =>
     {
         EtwTracingInterceptor etwTracer = new EtwTracingInterceptor();
         etwTracer.Exit(null, null);
     },
                      (dict) =>
     {
         Assert.Equal("", dict["InvocationId"]);
         Assert.Equal("", dict["ReturnValue"]);
     });
 }