Rendezvous/tests/FinalFactory.Rendezvous.Tests/Server/UdpMediatorServiceTests.cs

using System.Net;
using FinalFactory.Rendezvous.Server.Transport;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;

namespace FinalFactory.Rendezvous.Tests.Server;

public sealed class UdpMediatorServiceTests
{
    [Fact]
    public async Task ServiceBindsAnEphemeralUdpPortAndStopsCleanly()
    {
        using CancellationTokenSource timeout = new(TimeSpan.FromSeconds(5));
        UdpMediatorOptions options = new()
        {
            ListenAddress = IPAddress.Loopback.ToString(),
            Port = 0,
        };
        using UdpMediatorService service = new(
            Options.Create(options),
            NullLogger<UdpMediatorService>.Instance);

        await service.StartAsync(timeout.Token);

        IPEndPoint? boundEndpoint = service.LocalEndpoint;
        Assert.NotNull(boundEndpoint);
        Assert.Equal(IPAddress.Loopback, boundEndpoint.Address);
        Assert.InRange(boundEndpoint.Port, 1, 65_535);

        await service.StopAsync(timeout.Token);

        Assert.Null(service.LocalEndpoint);
    }
}