CODEWITHSUNDEEP
c#unit-testingxunit
TheColonel26
TheColonel26

Reputation: 2728

How do I use xUnit Assert.RaisesAny?

How do I use xUnit Assert.RaisesAny()? I can't seem to find any examples.

I received the following syntax error

The event 'IMqttServer.Started' can only appear on the left hand side of += or -=

This makes sense since I am not subscribing to it but I don't know what syntax to use with RaisesAny()

Basically, I am just trying to check that the Broker started, an at least 1 client connected to it and that it stopped.

P.S. MqttServer is an Mqtt Broker implementation that is part of MqttNet

here is my Test 

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);
        }
    }
}

Upvotes: 3

Views: 1742

Answers (1)

Jeroen
Jeroen

Reputation: 1262

Based on the source for EventAssertsTests (replaced x with _mqttBroker):

[Fact]
public static void GotExpectedEvent()
{
    var evt = Assert.RaisesAnyAsync<EventArgs>(
        h => _mqttBroker.Started += h,
        h => _mqttBroker.Started -= h,
        () => Task.Run(() => _mqttBroker.StartAsync(new MqttServerOptions())));

    Assert.NotNull(evt);
    Assert.Equal(_mqttBroker, evt.Sender);
    Assert.Equal(EventArgs.Empty, evt.Arguments);
}

Upvotes: 5

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