ProjectLoadTestEventEmitter.cs

using Microsoft.Extensions.Logging;
using OmniSharp.Eventing;
using OmniSharp.Mef;
using OmniSharp.Models.Events;
using OmniSharp.MSBuild.Notification;
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Composition.Hosting.Core;
using System.Threading;

namespace OmniSharp.MSBuild.Tests
{
    public partial class ProjectLoadListenerTests
    {
        public class ProjectLoadTestEventEmitter : IEventEmitter
        {
            public ImmutableArray<ProjectConfigurationMessage> ReceivedMessages { get; private set; } = ImmutableArray<ProjectConfigurationMessage>.Empty;
            private readonly ManualResetEvent _messageEvent = new ManualResetEvent(false);

            public void WaitForProjectUpdate()
            {
                _messageEvent.Reset();
                _messageEvent.WaitOne(TimeSpan.FromSeconds(5));
            }

            public ExportDescriptorProvider[] AsExportDescriptionProvider(ILoggerFactory loggerFactory)
            {
                var listener = new ProjectLoadListener(loggerFactory, this);

                return new ExportDescriptorProvider[]
                {
                    MefValueProvider.From<IMSBuildEventSink>(listener)
                };
            }

            public void Emit(string kind, object args)
            {
                if(args is ProjectConfigurationMessage message)
                {
                    ReceivedMessages = ReceivedMessages.Add(message);
                    _messageEvent.Set();
                }
            }
        }
    }
}