使用 NSubstitute 抛出异常验证是否调用了异步方法

Question

当我尝试验证是否使用 NSubstitute 调用了异步方法时，我收到一条错误消息

NSubstitute extension methods like .Received() can only be called on objects created using Substitute.For() and related methods

下面是一些示例代码来说明我的观点：

    public interface ISender
    {
       Task Send(string message);
    }
    public class Service
    {
        private readonly ISender _sender;

        public Service(ISender sender)
        {
            _sender = sender;
        }

        public async Task SendMessage(List<string> messages)
        {
            foreach (var message in messages)
            {
               await _sender.Send(message);
            }
        }
    }
    [Test]
    public async Task Test_Async_Method()
    {
        var mock = Substitute.For<ISender>();

        var service = new Service(mock);
        var messages = new List<string>{"Foo","Bar"};
       await service.SendMessage(messages);

        mock.Send(Arg.Any<string>()).Received(2);
    }

我知道问题是我正在验证 Task 而不是 mock.Send(Arg.Any<string>())，但我能做些什么呢？

Answer 1

你应该反转调用：

mock.Received(2).Send(Arg.Any<string>());

来源：http://nsubstitute.github.io/help/received-calls/

使用 NSubstitute 抛出异常验证是否调用了异步方法

Verify that an async method was called using NSubstitute throws exception

.net

c#

nsubstitute