用存根投掷ExpectException timeOutException不起作用C＃

Question

我有这个单元测试，我一直在试图对此进行例外，但是我无法做到，请你能帮我吗？

    [TestMethod]
    [ExpectedException(typeof(TimeoutException))]
    public async Task HandleAsyncDeleteModel_WhenRepositoryFails_ThrowsException()
    {
        //Arrange
        var token = new CancellationToken();
        var deleteModel = new DeleteProcessCommand(_img, _tnt, _pro, _url);
        var writeRepository = new StubIWriteRepository<Dto>()
        {
            DeleteIfExistsAsyncGuidGuidGuidCancellationToken = (img, tnt, pro, tkn) =>
            { 
                throw new TimeoutException();
            }
        };
        var Logger = new StubILogger();
        var commandHandler = new CommandHandler(Logger, writeRepository, null, null, null, null, null, null);
        //Act
        await commandHandler.HandleAsync(deleteModel, token);
    }

Answer 1

单元测试不要等待异步方法。没有人呼吁异步方法的结果。您需要在上面做一个等待，以强迫它等待结果。

[TestMethod]
[ExpectedException(typeof(TimeoutException))]
public async Task HandleAsyncDeleteModel_WhenRepositoryFails_ThrowsException()
{
    //Arrange
    var token = new CancellationToken();
    var deleteModel = new DeleteProcessCommand(_img, _tnt, _pro, _url);
    var writeRepository = new StubIWriteRepository<Dto>()
    {
        DeleteIfExistsAsyncGuidGuidGuidCancellationToken = (img, tnt, pro, tkn) =>
        { 
            throw new TimeoutException();
        }
    };
    var Logger = new StubILogger();
    var commandHandler = new CommandHandler(Logger, writeRepository, null, null, null, null, null, null);
    //Act
    commandHandler.HandleAsync(deleteModel, token).Wait();
}