MQTTnet/Source/MQTTnet.Tests/Server/Retain_As_Published_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.Tasks;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using MQTTnet.Formatter;

namespace MQTTnet.Tests.Server;

// ReSharper disable InconsistentNaming
[TestClass]
public sealed class Retain_As_Published_Tests : BaseTestClass
{
    [TestMethod]
    public Task Subscribe_With_Retain_As_Published()
    {
        return ExecuteTest(true);
    }

    [TestMethod]
    public Task Subscribe_Without_Retain_As_Published()
    {
        return ExecuteTest(false);
    }

    async Task ExecuteTest(bool retainAsPublished)
    {
        using var testEnvironment = CreateTestEnvironment(MqttProtocolVersion.V500);
        await testEnvironment.StartServer();

        var client1 = await testEnvironment.ConnectClient();
        var applicationMessageHandler = testEnvironment.CreateApplicationMessageHandler(client1);
        var topicFilter = testEnvironment.ClientFactory.CreateTopicFilterBuilder().WithTopic("Topic").WithRetainAsPublished(retainAsPublished).Build();
        await client1.SubscribeAsync(topicFilter);
        await LongTestDelay();

        // The client will publish a message where it is itself subscribing to.
        await client1.PublishStringAsync("Topic", "Payload", retain: true);
        await LongTestDelay();

        applicationMessageHandler.AssertReceivedCountEquals(1);
        Assert.AreEqual(retainAsPublished, applicationMessageHandler.ReceivedEventArgs[0].ApplicationMessage.Retain);
    }
}