ReactiveUI测试

Question

我试图查看视图模型的结果是否正在执行正确的操作。

我的可观测值设置如下：

public FilterBoxViewModel()
{
    var asyncFilterResults = this.filterItemsCommand.RegisterAsyncTask(x => 
        this.PerformFilter(x as string));

    this.filteredItems = new ObservableAsPropertyHelper<IEnumerable<IFilterBoxItem>>(
        asyncFilterResults, _ => this.RaisePropertyChanged("FilteredItems"));

    this.WhenAnyValue(x => x.SearchTerm)
        .Throttle(TimeSpan.FromMilliseconds(50))
        .Skip(1)
        .Subscribe(this.filterItemsCommand.Execute);
}

然后再往下走

private async Task<IEnumerable<IFilterBoxItem>> PerformFilter(string searchTerm)
{
    if (string.IsNullOrWhiteSpace(searchTerm))
    {
        return Enumerable.Empty<IFilterBoxItem>();
    }

    // Perform getting the items on the main thread and async await the results. 
    // This is provide a immutable version of the results so we don't cause 
    // threading issues.
    var items = await Observable.Start(
        () => this.FilterBoxManager.RootElements.GetAllItemsEnumerable()
                  .ToList().Select(x => new { Name = x.Name, Item = x }),
                       RxApp.MainThreadScheduler);

    return
        items.Where(x =>
            x.Name.IndexOf(searchTerm, StringComparison.OrdinalIgnoreCase) >= 0)
                .Select(x => x.Item);
}

在我的测试中，我运行测试计划并推进它，但是，我让PerformFilter在我预期的不同时间执行。

我的测试是：

(new TestScheduler()).With(scheduler =>
{
    var viewModel = new FilterBoxViewModel();

    var testManager = new TestManager { RootElements = this.sampleItems };

    viewModel.FilterBoxManager = testManager;

    viewModel.SearchTerm = "folder";

    scheduler.AdvanceBy(TimeSpan.FromMilliseconds(51).Ticks);

    Assert.AreEqual(viewModel.FilteredItems.Select(x => x.Name), folderSearchResults);

    viewModel.SearchTerm = "apple";

    Assert.AreEqual(viewModel.FilteredItems.Select(x => x.Name), appleSearchResults);

});

如何使测试人员更可预测？

我正在运行ReactiveUI 5.5.1并在XAML应用程序中运行。

Answer 1

您的Throttle没有设置调度程序，这是一个典型的TestScheduler错误