GHZMRNavigatorProXR/com.unity.renderstreaming/Tests/Runtime/SignalingManagerInternalTest.cs

using System;
using System.Linq;
using System.Collections;
using NUnit.Framework;
using Unity.RenderStreaming.RuntimeTest.Signaling;
using Unity.WebRTC;
using UnityEngine;
using UnityEngine.TestTools;

namespace Unity.RenderStreaming.RuntimeTest
{
    enum TestMode
    {
        PrivateMode,
        PublicMode
    }

    static class SignalingManagerInternalExtension
    {
        public static RTCRtpTransceiver AddSenderTrack(this SignalingManagerInternal target, string connectionId, MediaStreamTrack track)
        {
            RTCRtpTransceiverInit init = new RTCRtpTransceiverInit() { direction = RTCRtpTransceiverDirection.SendOnly };
            return target.AddTransceiver(connectionId, track, init);
        }
    }

    class SignalingManagerInternalTest
    {
        class MyMonoBehaviourTest : MonoBehaviour, IMonoBehaviourTest
        {
            public bool IsTestFinished
            {
                get { return true; }
            }
        }

        private MonoBehaviourTest<MyMonoBehaviourTest> test;

        [SetUp]
        public void SetUp()
        {
            test = new MonoBehaviourTest<MyMonoBehaviourTest>();
        }

        [TearDown]
        public void TearDown()
        {
            test.component.StopAllCoroutines();
            UnityEngine.Object.Destroy(test.gameObject);
        }

        // workaround: More time for SetDescription process
        const float ResendOfferInterval = 3f;

        private RenderStreamingDependencies CreateDependencies()
        {
            return new RenderStreamingDependencies
            {
                signaling = new MockSignaling(),
                config = new RTCConfiguration
                {
                    iceServers = new[] { new RTCIceServer { urls = new[] { "stun:stun.l.google.com:19302" } } },
                },
                startCoroutine = test.component.StartCoroutine,
                stopCoroutine = test.component.StopCoroutine,
                resentOfferInterval = ResendOfferInterval,
            };
        }

        [TestCase(TestMode.PublicMode, ExpectedResult = null)]
        [TestCase(TestMode.PrivateMode, ExpectedResult = null)]
        [UnityTest, Timeout(10000)]
        public IEnumerator Construct(TestMode mode)
        {
            MockSignaling.Reset(mode == TestMode.PrivateMode);

            var dependencies = CreateDependencies();
            var target = new SignalingManagerInternal(ref dependencies);

            bool isStarted = false;
            target.onStart += () => { isStarted = true; };
            yield return new WaitUntil(() => isStarted);
            Assert.That(isStarted, Is.True);

            target.Dispose();
        }

        [TestCase(TestMode.PublicMode, ExpectedResult = null)]
        [TestCase(TestMode.PrivateMode, ExpectedResult = null)]
        [UnityTest, Timeout(10000)]
        public IEnumerator ConstructMultiple(TestMode mode)
        {
            MockSignaling.Reset(mode == TestMode.PrivateMode);

            var dependencies1 = CreateDependencies();
            var dependencies2 = CreateDependencies();
            var target1 = new SignalingManagerInternal(ref dependencies1);
            var target2 = new SignalingManagerInternal(ref dependencies2);

            bool isStarted1 = false;
            bool isStarted2 = false;
            target1.onStart += () => { isStarted1 = true; };
            target2.onStart += () => { isStarted2 = true; };
            yield return new WaitUntil(() => isStarted1);
            yield return new WaitUntil(() => isStarted2);
            Assert.That(isStarted1, Is.True);
            Assert.That(isStarted2, Is.True);

            target1.Dispose();
            target2.Dispose();
        }

        [TestCase(TestMode.PublicMode, ExpectedResult = null)]
        [TestCase(TestMode.PrivateMode, ExpectedResult = null)]
        [UnityTest, Timeout(10000)]
        public IEnumerator OpenConnection(TestMode mode)
        {
            MockSignaling.Reset(mode == TestMode.PrivateMode);

            var dependencies = CreateDependencies();
            var target = new SignalingManagerInternal(ref dependencies);

            bool isStarted = false;
            target.onStart += () => { isStarted = true; };
            yield return new WaitUntil(() => isStarted);
            Assert.That(isStarted, Is.True);

            string connectionId = "12345";
            Assert.That(target.ExistConnection(connectionId), Is.False);

            target.CreateConnection(connectionId);
            bool isCreatedConnection = false;
            target.onCreatedConnection += _ => { isCreatedConnection = true; };
            yield return new WaitUntil(() => isCreatedConnection);
            Assert.That(isCreatedConnection, Is.True);
            Assert.That(target.ExistConnection(connectionId), Is.True);

            target.DeleteConnection(connectionId);
            bool isDeletedConnection = false;
            target.onDeletedConnection += _ => { isDeletedConnection = true; };
            yield return new WaitUntil(() => isDeletedConnection);
            Assert.That(isDeletedConnection, Is.True);
            Assert.That(target.ExistConnection(connectionId), Is.False);

            target.Dispose();
        }

        [TestCase(TestMode.PublicMode, ExpectedResult = null)]
        [TestCase(TestMode.PrivateMode, ExpectedResult = null)]
        [UnityTest, Timeout(10000)]
        public IEnumerator OpenConnectionThrowException(TestMode mode)
        {
            MockSignaling.Reset(mode == TestMode.PrivateMode);

            var dependencies = CreateDependencies();
            var target = new SignalingManagerInternal(ref dependencies);

            bool isStarted = false;
            target.onStart += () => { isStarted = true; };
            yield return new WaitUntil(() => isStarted);
            Assert.That(isStarted, Is.True);

            Assert.That(() => target.CreateConnection(null), Throws.TypeOf<ArgumentException>());
            Assert.That(() => target.CreateConnection(string.Empty), Throws.TypeOf<ArgumentException>());
            target.Dispose();
        }

        //todo:: crash in dispose process on standalone linux
        [TestCase(TestMode.PublicMode, ExpectedResult = null)]
        [TestCase(TestMode.PrivateMode, ExpectedResult = null)]
        [UnityTest, Timeout(10000)]
        [UnityPlatform(exclude = new[] { RuntimePlatform.LinuxPlayer })]
        public IEnumerator AddTrack(TestMode mode)
        {
            MockSignaling.Reset(mode == TestMode.PrivateMode);

            var dependencies = CreateDependencies();
            var target = new SignalingManagerInternal(ref dependencies);

            bool isStarted = false;
            target.onStart += () => { isStarted = true; };
            yield return new WaitUntil(() => isStarted);
            Assert.That(isStarted, Is.True);

            var connectionId = "12345";
            bool isCreatedConnection = false;
            target.onCreatedConnection += _ => { isCreatedConnection = true; };
            target.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection);
            Assert.That(isCreatedConnection, Is.True);
            Assert.That(target.GetTransceivers(connectionId).Count(), Is.EqualTo(0));

            var camObj = new GameObject("Camera");
            var camera = camObj.AddComponent<Camera>();
            VideoStreamTrack track = camera.CaptureStreamTrack(1280, 720);

            var transceiver = target.AddSenderTrack(connectionId, track);
            Assert.That(transceiver.Direction, Is.EqualTo(RTCRtpTransceiverDirection.SendOnly));
            Assert.That(target.GetTransceivers(connectionId).Count(), Is.EqualTo(1));
            target.RemoveSenderTrack(connectionId, track);

            bool isDeletedConnection = false;
            target.onDeletedConnection += _ => { isDeletedConnection = true; };
            target.DeleteConnection(connectionId);
            yield return new WaitUntil(() => isDeletedConnection);
            Assert.That(isDeletedConnection, Is.True);

            target.Dispose();
            track.Dispose();
            UnityEngine.Object.Destroy(camObj);
        }

        [TestCase(TestMode.PublicMode, ExpectedResult = null)]
        [TestCase(TestMode.PrivateMode, ExpectedResult = null)]
        [UnityTest]
        public IEnumerator AddTrackThrowException(TestMode mode)
        {
            MockSignaling.Reset(mode == TestMode.PrivateMode);

            var dependencies = CreateDependencies();
            var target = new SignalingManagerInternal(ref dependencies);

            bool isStarted = false;
            target.onStart += () => { isStarted = true; };
            yield return new WaitUntil(() => isStarted);
            Assert.That(isStarted, Is.True);

            var connectionId = "12345";
            target.CreateConnection(connectionId);
            bool isCreatedConnection = false;
            target.onCreatedConnection += _ => { isCreatedConnection = true; };
            yield return new WaitUntil(() => isCreatedConnection);
            Assert.That(isCreatedConnection, Is.True);

            Assert.That(() => target.AddSenderTrack(null, null), Throws.TypeOf<ArgumentNullException>());
            Assert.That(() => target.AddSenderTrack(connectionId, null), Throws.TypeOf<ArgumentNullException>());
            Assert.That(() => target.RemoveSenderTrack(null, null), Throws.TypeOf<ArgumentNullException>());
            Assert.That(() => target.RemoveSenderTrack(connectionId, null), Throws.TypeOf<InvalidOperationException>());
            target.DeleteConnection(connectionId);
            bool isDeletedConnection = false;
            target.onDeletedConnection += _ => { isDeletedConnection = true; };
            yield return new WaitUntil(() => isDeletedConnection);
            Assert.That(isDeletedConnection, Is.True);

            target.Dispose();
        }

        //todo:: crash in dispose process on standalone linux
        [TestCase(TestMode.PublicMode, ExpectedResult = null)]
        [TestCase(TestMode.PrivateMode, ExpectedResult = null)]
        [UnityTest, Timeout(10000)]
        [UnityPlatform(exclude = new[] { RuntimePlatform.LinuxPlayer })]
        public IEnumerator AddTrackMultiple(TestMode mode)
        {
            MockSignaling.Reset(mode == TestMode.PrivateMode);

            var dependencies = CreateDependencies();
            var target = new SignalingManagerInternal(ref dependencies);

            bool isStarted = false;
            target.onStart += () => { isStarted = true; };
            yield return new WaitUntil(() => isStarted);
            Assert.That(isStarted, Is.True);

            var connectionId = "12345";
            target.CreateConnection(connectionId);
            bool isCreatedConnection = false;
            target.onCreatedConnection += _ => { isCreatedConnection = true; };
            yield return new WaitUntil(() => isCreatedConnection);
            Assert.That(isCreatedConnection, Is.True);

            var camObj = new GameObject("Camera");
            var camera = camObj.AddComponent<Camera>();
            VideoStreamTrack track = camera.CaptureStreamTrack(1280, 720);
            var transceiver1 = target.AddSenderTrack(connectionId, track);
            Assert.That(transceiver1.Direction, Is.EqualTo(RTCRtpTransceiverDirection.SendOnly));

            var camObj2 = new GameObject("Camera2");
            var camera2 = camObj2.AddComponent<Camera>();
            VideoStreamTrack track2 = camera2.CaptureStreamTrack(1280, 720);
            var transceiver2 = target.AddSenderTrack(connectionId, track2);
            Assert.That(transceiver2.Direction, Is.EqualTo(RTCRtpTransceiverDirection.SendOnly));

            target.DeleteConnection(connectionId);
            bool isDeletedConnection = false;
            target.onDeletedConnection += _ => { isDeletedConnection = true; };
            yield return new WaitUntil(() => isDeletedConnection);
            Assert.That(isDeletedConnection, Is.True);

            target.Dispose();
            track.Dispose();
            track2.Dispose();
            UnityEngine.Object.Destroy(camObj);
            UnityEngine.Object.Destroy(camObj2);
        }

        [TestCase(TestMode.PublicMode, ExpectedResult = null)]
        [TestCase(TestMode.PrivateMode, ExpectedResult = null)]
        [UnityTest, Timeout(10000)]
        public IEnumerator CreateChannel(TestMode mode)
        {
            MockSignaling.Reset(mode == TestMode.PrivateMode);

            var dependencies = CreateDependencies();
            var target = new SignalingManagerInternal(ref dependencies);
            bool isStarted = false;
            target.onStart += () => { isStarted = true; };
            yield return new WaitUntil(() => isStarted);
            Assert.That(isStarted, Is.True);

            var connectionId = "12345";
            target.CreateConnection(connectionId);
            bool isCreatedConnection = false;
            target.onCreatedConnection += _ => { isCreatedConnection = true; };
            yield return new WaitUntil(() => isCreatedConnection);

            string channelName = "test";
            var channel = target.CreateChannel(connectionId, channelName);
            Assert.That(channel.Label, Is.EqualTo(channelName));

            target.DeleteConnection(connectionId);
            bool isDeletedConnection = false;
            target.onDeletedConnection += _ => { isDeletedConnection = true; };
            yield return new WaitUntil(() => isDeletedConnection);
            Assert.That(isDeletedConnection, Is.True);

            target.Dispose();
            channel.Dispose();
        }

        //todo:: crash in dispose process on standalone linux
        [UnityTest, Timeout(10000)]
        [UnityPlatform(exclude = new[] { RuntimePlatform.LinuxPlayer, RuntimePlatform.Android })]
        public IEnumerator OnAddReceiverPrivateMode()
        {
            MockSignaling.Reset(true);

            var dependencies1 = CreateDependencies();
            var dependencies2 = CreateDependencies();
            var target1 = new SignalingManagerInternal(ref dependencies1);
            var target2 = new SignalingManagerInternal(ref dependencies2);

            bool isStarted1 = false;
            bool isStarted2 = false;
            target1.onStart += () => { isStarted1 = true; };
            target2.onStart += () => { isStarted2 = true; };
            yield return new WaitUntil(() => isStarted1 && isStarted2);
            Assert.That(isStarted1, Is.True);
            Assert.That(isStarted2, Is.True);

            bool isCreatedConnection1 = false;
            bool isCreatedConnection2 = false;
            target1.onCreatedConnection += _ => { isCreatedConnection1 = true; };
            target2.onCreatedConnection += _ => { isCreatedConnection2 = true; };

            var connectionId = "12345";

            // target1 is Receiver in private mode
            target1.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection1);
            Assert.That(isCreatedConnection1, Is.True);

            // target2 is sender in private mode
            target2.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection2);
            Assert.That(isCreatedConnection2, Is.True);

            bool isAddReceiver1 = false;
            bool isGotAnswer2 = false;
            target1.onAddTransceiver += (_, receiver) => { isAddReceiver1 = true; };
            target1.onGotOffer += (_, sdp) => { target1.SendAnswer(connectionId); };
            target2.onGotAnswer += (_, sdp) => { isGotAnswer2 = true; };

            var camObj = new GameObject("Camera");
            var camera = camObj.AddComponent<Camera>();
            VideoStreamTrack track = camera.CaptureStreamTrack(1280, 720);

            // send offer automatically after adding a Track
            var transceiver = target2.AddSenderTrack(connectionId, track);
            Assert.That(transceiver, Is.Not.Null);
            Assert.That(transceiver.Direction, Is.EqualTo(RTCRtpTransceiverDirection.SendOnly));

            yield return new WaitUntil(() => isAddReceiver1 && isGotAnswer2);
            Assert.That(isAddReceiver1, Is.True);
            Assert.That(isGotAnswer2, Is.True);

            target1.DeleteConnection(connectionId);
            target2.DeleteConnection(connectionId);

            bool isDeletedConnection1 = false;
            bool isDeletedConnection2 = false;
            target1.onDeletedConnection += _ => { isDeletedConnection1 = true; };
            target2.onDeletedConnection += _ => { isDeletedConnection2 = true; };
            yield return new WaitUntil(() => isDeletedConnection1 && isDeletedConnection2);
            Assert.That(isDeletedConnection1, Is.True);
            Assert.That(isDeletedConnection2, Is.True);

            target1.Dispose();
            target2.Dispose();
            track.Dispose();
            UnityEngine.Object.Destroy(camObj);
        }

        //todo:: crash in dispose process on standalone linux
        [UnityTest, Timeout(10000)]
        [UnityPlatform(exclude = new[] { RuntimePlatform.LinuxPlayer, RuntimePlatform.Android })]
        public IEnumerator OnAddReceiverPublicMode()
        {
            MockSignaling.Reset(false);

            var dependencies1 = CreateDependencies();
            var dependencies2 = CreateDependencies();
            var target1 = new SignalingManagerInternal(ref dependencies1);
            var target2 = new SignalingManagerInternal(ref dependencies2);

            bool isStarted1 = false;
            bool isStarted2 = false;
            target1.onStart += () => { isStarted1 = true; };
            target2.onStart += () => { isStarted2 = true; };
            yield return new WaitUntil(() => isStarted1 && isStarted2);
            Assert.That(isStarted1, Is.True);
            Assert.That(isStarted2, Is.True);

            bool isCreatedConnection1 = false;
            bool isOnGotOffer2 = false;
            target1.onCreatedConnection += _ => { isCreatedConnection1 = true; };
            target2.onGotOffer += (_, sdp) => { isOnGotOffer2 = true; };

            var connectionId = "12345";

            // target1 is Receiver in public mode
            target1.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection1);
            Assert.That(isCreatedConnection1, Is.True);

            RTCRtpTransceiverInit init = new RTCRtpTransceiverInit()
            {
                direction = RTCRtpTransceiverDirection.RecvOnly
            };
            target1.AddTransceiver(connectionId, TrackKind.Video, init);

            // target2 is sender in private mode
            yield return new WaitUntil(() => isOnGotOffer2);
            Assert.That(isOnGotOffer2, Is.True);

            bool isAddReceiver1 = false;
            bool isGotAnswer1 = false;
            target1.onAddTransceiver += (_, receiver) => { isAddReceiver1 = true; };
            target1.onGotAnswer += (_, sdp) => { isGotAnswer1 = true; };

            var camObj = new GameObject("Camera");
            var camera = camObj.AddComponent<Camera>();
            VideoStreamTrack track = camera.CaptureStreamTrack(1280, 720);
            var transceiver2 = target2.AddSenderTrack(connectionId, track);
            Assert.That(transceiver2.Direction, Is.EqualTo(RTCRtpTransceiverDirection.SendOnly));
            target2.SendAnswer(connectionId);

            yield return new WaitUntil(() => isAddReceiver1 & isGotAnswer1);

            target1.DeleteConnection(connectionId);
            target2.DeleteConnection(connectionId);

            bool isDeletedConnection1 = false;
            bool isDeletedConnection2 = false;
            target1.onDeletedConnection += _ => { isDeletedConnection1 = true; };
            target2.onDeletedConnection += _ => { isDeletedConnection2 = true; };
            yield return new WaitUntil(() => isDeletedConnection1 && isDeletedConnection2);
            Assert.That(isDeletedConnection1, Is.True);
            Assert.That(isDeletedConnection2, Is.True);

            target1.Dispose();
            target2.Dispose();
            track.Dispose();
            UnityEngine.Object.DestroyImmediate(camObj);
        }

        [UnityTest, Timeout(10000)]
        public IEnumerator OnAddChannelPrivateMode()
        {
            MockSignaling.Reset(true);

            var dependencies1 = CreateDependencies();
            var dependencies2 = CreateDependencies();
            var target1 = new SignalingManagerInternal(ref dependencies1);
            var target2 = new SignalingManagerInternal(ref dependencies2);

            bool isStarted1 = false;
            bool isStarted2 = false;
            target1.onStart += () => { isStarted1 = true; };
            target2.onStart += () => { isStarted2 = true; };
            yield return new WaitUntil(() => isStarted1 && isStarted2);

            bool isCreatedConnection1 = false;
            bool isCreatedConnection2 = false;
            target1.onCreatedConnection += _ => { isCreatedConnection1 = true; };
            target2.onCreatedConnection += _ => { isCreatedConnection2 = true; };

            var connectionId = "12345";

            // target1 is Receiver in private mode
            target1.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection1);

            // target2 is sender in private mode
            target2.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection2);

            bool isAddChannel1 = false;
            bool isGotOffer1 = false;
            bool isGotAnswer2 = false;
            target1.onAddChannel += (_, _channel) => { isAddChannel1 = true; };
            target1.onGotOffer += (_, sdp) => { isGotOffer1 = true; };
            target2.onGotAnswer += (_, sdp) => { isGotAnswer2 = true; };

            // send offer automatically after creating channel
            RTCDataChannel channel = target2.CreateChannel(connectionId, "test");
            Assert.That(channel, Is.Not.Null);

            yield return new WaitUntil(() => isGotOffer1);
            Assert.That(isGotOffer1, Is.True);
            target1.SendAnswer(connectionId);

            yield return new WaitUntil(() => isAddChannel1 && isGotAnswer2);
            Assert.That(isAddChannel1, Is.True);
            Assert.That(isGotAnswer2, Is.True);

            target1.DeleteConnection(connectionId);
            target2.DeleteConnection(connectionId);

            bool isDeletedConnection1 = false;
            bool isDeletedConnection2 = false;
            target1.onDeletedConnection += _ => { isDeletedConnection1 = true; };
            target2.onDeletedConnection += _ => { isDeletedConnection2 = true; };
            yield return new WaitUntil(() => isDeletedConnection1 && isDeletedConnection2);
            Assert.That(isDeletedConnection1, Is.True);
            Assert.That(isDeletedConnection2, Is.True);

            target1.Dispose();
            target2.Dispose();
        }

        [UnityTest, Timeout(10000), LongRunning]
        public IEnumerator SendOfferThrowExceptionPrivateMode()
        {
            MockSignaling.Reset(true);

            var dependencies1 = CreateDependencies();
            var dependencies2 = CreateDependencies();
            var target1 = new SignalingManagerInternal(ref dependencies1);
            var target2 = new SignalingManagerInternal(ref dependencies2);

            bool isStarted1 = false;
            bool isStarted2 = false;
            target1.onStart += () => { isStarted1 = true; };
            target2.onStart += () => { isStarted2 = true; };
            yield return new WaitUntil(() => isStarted1 && isStarted2);

            bool isCreatedConnection1 = false;
            bool isCreatedConnection2 = false;
            target1.onCreatedConnection += _ => { isCreatedConnection1 = true; };
            target2.onCreatedConnection += _ => { isCreatedConnection2 = true; };

            var connectionId = "12345";

            // target1 is Receiver in private mode
            target1.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection1);

            // target2 is sender in private mode
            target2.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection2);

            bool isGotOffer1 = false;
            bool isGotAnswer2 = false;
            target1.onGotOffer += (_, sdp) => { isGotOffer1 = true; };
            target2.onGotAnswer += (_, sdp) => { isGotAnswer2 = true; };

            target2.SendOffer(connectionId);

            // each peer are not stable, signaling process not complete.
            yield return new WaitUntil(() => isGotOffer1);
            Assert.That(target1.IsStable(connectionId), Is.False);
            Assert.That(target2.IsStable(connectionId), Is.False);
            Assert.That(() => target1.SendOffer(connectionId), Throws.TypeOf<InvalidOperationException>());

            target1.SendAnswer(connectionId);
            yield return new WaitUntil(() => isGotAnswer2);
            Assert.That(isGotAnswer2, Is.True);

            // If target1 processes resent　Offer from target2, target1 is not stable.
            Assert.That(target2.IsStable(connectionId), Is.True);

            target1.DeleteConnection(connectionId);
            target2.DeleteConnection(connectionId);

            bool isDeletedConnection1 = false;
            bool isDeletedConnection2 = false;
            target1.onDeletedConnection += _ => { isDeletedConnection1 = true; };
            target2.onDeletedConnection += _ => { isDeletedConnection2 = true; };
            yield return new WaitUntil(() => isDeletedConnection1 && isDeletedConnection2);
            Assert.That(isDeletedConnection1, Is.True);
            Assert.That(isDeletedConnection2, Is.True);

            target1.Dispose();
            target2.Dispose();
        }

        [UnityTest, Timeout(30000), LongRunning]
        public IEnumerator SwapTransceiverPrivateMode()
        {
            MockSignaling.Reset(true);

            var dependencies1 = CreateDependencies();
            var dependencies2 = CreateDependencies();
            var target1 = new SignalingManagerInternal(ref dependencies1);
            var target2 = new SignalingManagerInternal(ref dependencies2);

            bool isStarted1 = false;
            bool isStarted2 = false;
            target1.onStart += () => { isStarted1 = true; };
            target2.onStart += () => { isStarted2 = true; };
            yield return new WaitUntil(() => isStarted1 && isStarted2);
            Assert.That(isStarted1, Is.True);
            Assert.That(isStarted2, Is.True);

            bool isCreatedConnection1 = false;
            bool isCreatedConnection2 = false;
            target1.onCreatedConnection += _ => { isCreatedConnection1 = true; };
            target2.onCreatedConnection += _ => { isCreatedConnection2 = true; };

            var connectionId = "12345";

            // target1 has impolite peer (request first)
            target1.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection1);
            Assert.That(isCreatedConnection1, Is.True);

            // target2 has polite peer (request second)
            target2.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection2);
            Assert.That(isCreatedConnection2, Is.True);

            bool isGotOffer1 = false;
            bool isGotOffer2 = false;
            bool isGotAnswer1 = false;
            target1.onGotOffer += (_, sdp) => { isGotOffer1 = true; };
            target2.onGotOffer += (_, sdp) => { isGotOffer2 = true; };
            target1.onGotAnswer += (_, sdp) => { isGotAnswer1 = true; };

            RTCRtpTransceiverInit init1 = new RTCRtpTransceiverInit()
            {
                direction = RTCRtpTransceiverDirection.SendOnly
            };
            RTCRtpTransceiverInit init2 = new RTCRtpTransceiverInit()
            {
                direction = RTCRtpTransceiverDirection.SendOnly
            };
            target1.AddTransceiver(connectionId, TrackKind.Audio, init1);
            target2.AddTransceiver(connectionId, TrackKind.Audio, init2);

            // check each target invoke onGotOffer
            yield return new WaitForSeconds(ResendOfferInterval * 5);

            // ignore offer because impolite peer
            Assert.That(isGotOffer1, Is.False, $"{nameof(isGotOffer1)} is not False.");
            // accept offer because polite peer
            Assert.That(isGotOffer2, Is.True, $"{nameof(isGotOffer2)} is not True.");

            target2.SendAnswer(connectionId);

            yield return new WaitUntil(() => isGotAnswer1);
            Assert.That(isGotAnswer1, Is.True, $"{nameof(isGotAnswer1)} is not True.");

            target1.DeleteConnection(connectionId);
            target2.DeleteConnection(connectionId);

            bool isDeletedConnection1 = false;
            bool isDeletedConnection2 = false;
            target1.onDeletedConnection += _ => { isDeletedConnection1 = true; };
            target2.onDeletedConnection += _ => { isDeletedConnection2 = true; };
            yield return new WaitUntil(() => isDeletedConnection1 && isDeletedConnection2);
            Assert.That(isDeletedConnection1, Is.True, $"{nameof(isDeletedConnection1)} is not True.");
            Assert.That(isDeletedConnection2, Is.True, $"{nameof(isDeletedConnection2)} is not True.");

            target1.Dispose();
            target2.Dispose();
        }

        [TestCase(TestMode.PublicMode, ExpectedResult = null)]
        [TestCase(TestMode.PrivateMode, ExpectedResult = null)]
        [UnityTest, Timeout(30000), LongRunning]
        public IEnumerator ResendOfferUntilGotAnswer(TestMode mode)
        {
            MockSignaling.Reset(mode == TestMode.PrivateMode);

            var dependencies1 = CreateDependencies();
            var dependencies2 = CreateDependencies();
            var target1 = new SignalingManagerInternal(ref dependencies1);
            var target2 = new SignalingManagerInternal(ref dependencies2);

            bool isStarted1 = false;
            bool isStarted2 = false;
            target1.onStart += () => { isStarted1 = true; };
            target2.onStart += () => { isStarted2 = true; };
            yield return new WaitUntil(() => isStarted1 && isStarted2);

            bool isCreatedConnection1 = false;
            bool isCreatedConnection2 = false;
            target1.onCreatedConnection += _ => { isCreatedConnection1 = true; };
            target2.onCreatedConnection += _ => { isCreatedConnection2 = true; };

            var connectionId = "12345";

            target1.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection1);
            Assert.That(isCreatedConnection1, Is.True);
            target2.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection2);
            Assert.That(isCreatedConnection2, Is.True);

            int countGotOffer2 = 0;
            target2.onGotOffer += (_, sdp) => { countGotOffer2++; };
            target1.SendOffer(connectionId);
            yield return new WaitUntil(() => countGotOffer2 > 1);
            Assert.That(countGotOffer2, Is.GreaterThan(1));

            bool isGotAnswer1 = false;
            target1.onGotAnswer += (_, sdp) => { isGotAnswer1 = true; };
            target2.SendAnswer(connectionId);
            yield return new WaitUntil(() => isGotAnswer1);
            Assert.That(isGotAnswer1, Is.True);

            yield return new WaitForSeconds(ResendOfferInterval * 2);
            var currentCount = countGotOffer2;
            yield return new WaitForSeconds(ResendOfferInterval * 2);
            Assert.That(countGotOffer2, Is.EqualTo(currentCount),
                $"{nameof(currentCount)} is not Equal {nameof(countGotOffer2)}");

            target1.DeleteConnection(connectionId);
            target2.DeleteConnection(connectionId);

            bool isDeletedConnection1 = false;
            bool isDeletedConnection2 = false;
            target1.onDeletedConnection += _ => { isDeletedConnection1 = true; };
            target2.onDeletedConnection += _ => { isDeletedConnection2 = true; };
            yield return new WaitUntil(() => isDeletedConnection1 && isDeletedConnection2);
            Assert.That(isDeletedConnection1, Is.True, $"{nameof(isDeletedConnection1)} is not True.");
            Assert.That(isDeletedConnection2, Is.True, $"{nameof(isDeletedConnection2)} is not True.");

            target1.Dispose();
            target2.Dispose();
        }

        [TestCase(TestMode.PublicMode, ExpectedResult = null)]
        [TestCase(TestMode.PrivateMode, ExpectedResult = null)]
        [UnityTest, Timeout(30000), LongRunning]
        public IEnumerator DeleteFailedPeers(TestMode mode)
        {
            MockSignaling.Reset(mode == TestMode.PrivateMode);

            var dependencies1 = CreateDependencies();
            var dependencies2 = CreateDependencies();
            var target1 = new SignalingManagerInternal(ref dependencies1);
            var target2 = new SignalingManagerInternal(ref dependencies2);

            bool isStarted1 = false;
            bool isStarted2 = false;
            target1.onStart += () => { isStarted1 = true; };
            target2.onStart += () => { isStarted2 = true; };
            yield return new WaitUntil(() => isStarted1 && isStarted2);
            Assert.That(isStarted1, Is.True);
            Assert.That(isStarted2, Is.True);

            bool isCreatedConnection1 = false;
            bool isCreatedConnection2 = false;
            target1.onCreatedConnection += _ => { isCreatedConnection1 = true; };
            target2.onCreatedConnection += _ => { isCreatedConnection2 = true; };

            var connectionId = "12345";

            // target1 has impolite peer (request first)
            target1.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection1);
            Assert.That(isCreatedConnection1, Is.True);
            target2.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection2);
            Assert.That(isCreatedConnection2, Is.True);

            bool isGotOffer2 = false;
            bool isGotAnswer1 = false;
            target2.onGotOffer += (_, sdp) => { isGotOffer2 = true; };
            target1.onGotAnswer += (_, sdp) => { isGotAnswer1 = true; };

            RTCRtpTransceiverInit init1 = new RTCRtpTransceiverInit()
            {
                direction = RTCRtpTransceiverDirection.SendOnly
            };
            target1.AddTransceiver(connectionId, TrackKind.Video, init1);

            yield return new WaitUntil(() => isGotOffer2);
            Assert.That(isGotOffer2, Is.True, $"{nameof(isGotOffer2)} is not True.");

            target2.SendAnswer(connectionId);

            yield return new WaitUntil(() => isGotAnswer1);
            Assert.That(isGotAnswer1, Is.True, $"{nameof(isGotAnswer1)} is not True.");

            // Improperly dispose of target1 to force failed state on target2
            target1.Dispose();

            bool isDeletedConnection2 = false;
            target2.onDeletedConnection += _ => { isDeletedConnection2 = true; };
            yield return new WaitUntil(() => isDeletedConnection2);
            Assert.That(isDeletedConnection2, Is.True, $"{nameof(isDeletedConnection2)} is not True.");

            target2.Dispose();
        }

        [UnityTest, Timeout(10000)]
        public IEnumerator ReNegotiationAfterReceivingFirstOffer()
        {
            MockSignaling.Reset(true);

            var dependencies1 = CreateDependencies();
            var dependencies2 = CreateDependencies();
            var target1 = new SignalingManagerInternal(ref dependencies1);
            var target2 = new SignalingManagerInternal(ref dependencies2);

            bool isStarted1 = false;
            bool isStarted2 = false;
            target1.onStart += () => { isStarted1 = true; };
            target2.onStart += () => { isStarted2 = true; };
            yield return new WaitUntil(() => isStarted1 && isStarted2);

            bool isCreatedConnection1 = false;
            bool isCreatedConnection2 = false;
            target1.onCreatedConnection += _ => { isCreatedConnection1 = true; };
            target2.onCreatedConnection += _ => { isCreatedConnection2 = true; };

            var connectionId = "12345";

            // target1 has impolite peer (request first)
            target1.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection1);

            // target2 has polite peer (request second)
            target2.CreateConnection(connectionId);
            yield return new WaitUntil(() => isCreatedConnection2);

            bool isGotOffer1 = false;
            bool isGotOffer2 = false;
            bool isGotAnswer1 = false;
            bool isGotAnswer2 = false;
            target1.onGotOffer += (_, sdp) => { isGotOffer1 = true; };
            target2.onGotOffer += (_, sdp) => { isGotOffer2 = true; };
            target1.onGotAnswer += (_, sdp) => { isGotAnswer1 = true; };
            target2.onGotAnswer += (_, sdp) => { isGotAnswer2 = true; };

            var init1 = new RTCRtpTransceiverInit() { direction = RTCRtpTransceiverDirection.SendOnly };
            var init2 = new RTCRtpTransceiverInit() { direction = RTCRtpTransceiverDirection.RecvOnly };
            var init3 = new RTCRtpTransceiverInit() { direction = RTCRtpTransceiverDirection.SendOnly };
            var init4 = new RTCRtpTransceiverInit() { direction = RTCRtpTransceiverDirection.RecvOnly };
            target1.AddTransceiver(connectionId, TrackKind.Video, init1);
            target1.AddTransceiver(connectionId, TrackKind.Video, init2);
            target2.AddTransceiver(connectionId, TrackKind.Video, init3);
            target2.AddTransceiver(connectionId, TrackKind.Video, init4);

            yield return new WaitUntil(() => isGotOffer2);
            Assert.That(isGotOffer2, Is.True, $"{nameof(isGotOffer2)} is not True.");
            target2.SendAnswer(connectionId);

            yield return new WaitUntil(() => isGotAnswer1);
            Assert.That(isGotAnswer1, Is.True, $"{nameof(isGotAnswer1)} is not True.");

            yield return new WaitUntil(() => isGotOffer1);
            Assert.That(isGotOffer1, Is.True, $"{nameof(isGotOffer1)} is not True.");
            target1.SendAnswer(connectionId);

            yield return new WaitUntil(() => isGotAnswer2);
            Assert.That(isGotAnswer2, Is.True, $"{nameof(isGotAnswer2)} is not True.");

            target1.DeleteConnection(connectionId);
            target2.DeleteConnection(connectionId);

            bool isDeletedConnection1 = false;
            bool isDeletedConnection2 = false;
            target1.onDeletedConnection += _ => { isDeletedConnection1 = true; };
            target2.onDeletedConnection += _ => { isDeletedConnection2 = true; };
            yield return new WaitUntil(() => isDeletedConnection1 && isDeletedConnection2);
            Assert.That(isDeletedConnection1, Is.True, $"{nameof(isDeletedConnection1)} is not True.");
            Assert.That(isDeletedConnection2, Is.True, $"{nameof(isDeletedConnection1)} is not True.");

            target1.Dispose();
            target2.Dispose();
        }
    }
}