如何使用xunit assert.raisesany?

如何使用xunit assert.raisesany()?我似乎找不到任何例子。

我收到以下语法错误

事件“imqtserver.started”只能出现在左侧 +=或-=

这是有意义的,因为我没有订阅它,但我不知道要对raisesany()使用什么语法

基本上,我只是想检查代理是否启动了,至少有1个客户机连接到它,它是否停止了。

p.s.mqttserver是一个mqtt代理实现,它是 MqttNet

这是我的测试

public class ResearchTestingOnly
{

    private readonly ITestOutputHelper output;

    public ResearchTestingOnly(ITestOutputHelper output)
    {
        this.output = output;
    }


    [Fact]
    public void Test1()
    {

        IMqttServer _mqttBroker = new MqttFactory().CreateMqttServer();

        var receivedEvents = new List<string>();

        _mqttBroker.ClientConnected += delegate (object sender, MqttClientConnectedEventArgs args)
        {
            receivedEvents.Add(args.ClientId);
        };

        Assert.RaisesAny<EventHandler>(_mqttBroker.Started);

        Assert.RaisesAny<MqttClientConnectedEventArgs>(_mqttBroker.ClientConnected);

        Assert.RaisesAny<EventHandler>(_mqttBroker.Stopped);

        //** Start Broker
        Task _brokerTask = Task.Run(() => _mqttBroker.StartAsync(new MqttServerOptions()));

        //** Wait 10 Seconds
        var pause = new ManualResetEvent(false);
        pause.WaitOne(10000);

        //** Stop Broker
        Task _brokerStopTask = Task.Run(() => _mqttBroker.StopAsync());

        //** Wait for Broker Tasks to Complete
        Task.WaitAll(_brokerTask, _brokerStopTask);

        output.WriteLine($"Number of Clients Connected: {receivedEvents.Count}");
        foreach(var b in receivedEvents)
        {
            output.WriteLine(b);
        }
    }
}