Visual Studio Test Tools JSON Extraction Rule using JSON.net

JsonExtractionRule.cs

using System;
using System.ComponentModel;
using System.Globalization;
using Microsoft.VisualStudio.TestTools.WebTesting;
using Newtonsoft.Json.Linq;

namespace Amido.PerformanceTests.Common {
  [DisplayName("JSON Extraction Rule")]
  [Description("Extracts the specified JSON value from an object.")]
  public class JsonExtractionRule : ExtractionRule {
    public string Name { get; set; }

    public override void Extract(object sender, ExtractionEventArgs e) {
      if (e.Response.BodyString != null) {
        var json = e.Response.BodyString;
        var data = JObject.Parse(json);

        if (data != null) {
          e.WebTest.Context.Add(this.ContextParameterName, data.SelectToken(Name));
          e.Success = true;
          return;
        }
      }

      e.Success = false;
      e.Message = String.Format(CultureInfo.CurrentCulture, "Not Found: {0}", Name);
    }
  }
}

Is this supposed to always "Passed" during the test? I cannot make this test fail. Even when I enter a value into "Name" that doesn't exist in the response, the test still passes.