我遇到了一些关于异步方法单元测试的问题。
以下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);
}
当我运行这个测试时，似乎永远无法通过第一个await语句。如果有帮助的话，这里是被测试的方法：
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!");
}
}
非常感谢您的帮助。谢谢。