Rhino嘲笑未正确返回集合的期望

我是Rhino Mocks的新手,通常使用模拟隔离框架进行单元测试。我已经编写了以下测试,其中我设置了一个模拟IDataProvider对象的期望值,以返回对象集合。提供的集合中有一个对象。

当我运行测试时,对IDataProvider的调用将返回一个空列表,当它应该返回包含一个对象的列表时。

有什么问题吗?

这是我的测试:(请原谅这里有任何不好的做法…随便提一下。我在努力学习!谢谢)

[TestMethod()]
public void FetchDataSeries_NeedsUpdate_SuccessfulDataSeriesRetrievedFromDataProvider() {
  List<IDataSeries> dataSeries = new List<IDataSeries>();
  dataSeries.Add(new DataSeries("test"));
  DrillDownLevel level = DrillDownLevel.YEAR;
  int? year = 2008;

  var dataProvider = _MockRepository.CreateMock<IDataProvider>();
  dataProvider.Expect(dp => dp.GetDataSeries(String.Empty, level, year, null ,null, null)).Return(dataSeries);
  _DataSourceContext.DataProvider = dataProvider;

  CollectionAssert.AreEqual(dataSeries, _DataSourceContext.FetchDataSeries(level, year, null, null, null));
  dataProvider.VerifyAllExpectations();
}

正在测试的方法的相关部分:(dataProvider.GetDataSeries调用返回空列表…这应该返回存根列表。)

      public override List<IDataSeries> FetchDataSeries(DrillDownLevel? drillDownLevel, int? year, int? month, DateTime? week, int? day) {

    List<IDataSeries> dataSeries = new List<IDataSeries>();

    // Cache data for maximum cache period
    // if data has been cached for longer than the maxium cache period OR the updateInterval has elapsed UNLESS LastUpdateAttempt was less than minimum update interval
    if (NeedsUpdate(LastUpdate, LastUpdateAttempt)) {

      // Attempt to get new data
      LoggingService.InfoFormat("DataSourceContext: {0}: Attempting to get new data:", Name);
      dataSeries = DataProvider.GetDataSeries(DataQuery, drillDownLevel, year, month, week, day);
    }

    return dataSeries;
  }