c# – 单元测试异步方法

这是我的单元测试代码：

[TestMethod]
    public async Task TestrefreshList_refreshesList()
    {
        int countBeforeAdd = listviewmodel.Notestitles.Count;

        // Add a note.
        await listviewmodel.NoteRepository.AddNoteAsync(new Note { title = String.Empty,Content = String.Empty });

        // refresh.
        await listviewmodel.refreshList();

        int countAfterAdd = listviewmodel.Notestitles.Count;

        // Assert that the count increased by 1 and that it matches the count of the repository.
        Assert.IsTrue(countAfterAdd == countBeforeAdd + 1 && countAfterAdd == mockNoteRepository.FakeNotes.Count);
    }

当我运行此测试时,似乎永远不会超过第一个await语句.如果有帮助,以下是测试中的方法：

public ObservableCollection<Note> FakeNotes { get; set; }

    public Task AddNoteAsync(Models.Note notE)
    {
        return new Task(() => 
        {
            FakeNotes.Add(notE);
        });
    }

    public Task<ObservableCollection<String>> GetAllNotetitlesAsync()
    {
        // Return the titles of the notes in the FakeNotes collection.
        return new Task<ObservableCollection<String>>(() =>
        {
            return new ObservableCollection<String>(FakeNotes.SELEct(n => n.titlE));
        });
    }

….

public async Task refreshList()
    {
        try
        {
            Notestitles = await NoteRepository.GetAllNotetitlesAsync();
        }
        catch (Exception)
        {
            Notifier.Notify("We encountered an error when trying to load your notes. Please try again. ","Ooops!");
        }
    }

任何帮助,将不胜感激.谢谢.