MQTTnet/Source/MQTTnet.Tests/Server/User_Properties_Tests.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System.Threading;
using System.Threading.Tasks;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using MQTTnet.Formatter;
using MQTTnet.Internal;
using MQTTnet.Packets;
using MQTTnet.Tests.Mockups;

namespace MQTTnet.Tests.Server;

// ReSharper disable InconsistentNaming
[TestClass]
public class Feature_Tests
{
    public TestContext TestContext { get; set; }

    [TestMethod]
    public async Task Use_User_Properties()
    {
        using var testEnvironment = new TestEnvironment(TestContext);
        await testEnvironment.StartServer();

        var sender = await testEnvironment.ConnectClient(new MqttClientOptionsBuilder().WithProtocolVersion(MqttProtocolVersion.V500));
        var receiver = await testEnvironment.ConnectClient(new MqttClientOptionsBuilder().WithProtocolVersion(MqttProtocolVersion.V500));

        var message = new MqttApplicationMessageBuilder()
            .WithTopic("A")
            .WithUserProperty("x", "1")
            .WithUserProperty("y", "2")
            .WithUserProperty("z", "3")
            .WithUserProperty("z", "4"); // z is here two times to test list of items

        await receiver.SubscribeAsync(new MqttClientSubscribeOptions
        {
            TopicFilters = [new MqttTopicFilter { Topic = "#" }]
        }, CancellationToken.None);

        MqttApplicationMessage receivedMessage = null;
        receiver.ApplicationMessageReceivedAsync += e =>
        {
            receivedMessage = e.ApplicationMessage;
            return CompletedTask.Instance;
        };

        await sender.PublishAsync(message.Build(), CancellationToken.None);

        await Task.Delay(1000);

        Assert.IsNotNull(receivedMessage);
        Assert.AreEqual("A", receivedMessage.Topic);
        Assert.AreEqual(4, receivedMessage.UserProperties.Count);
    }
}