<!doctype html>
<meta charset=utf-8>
<meta name="timeout" content="long">
<title>RTCRtpSender.transport</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="dictionary-helper.js"></script>
<script src="RTCPeerConnection-helper.js"></script>
<script>
  'use strict';

  // Spec link: http://w3c.github.io/webrtc-pc/#dom-rtcrtpsender-transport
  promise_test(async t => {
    const caller = new RTCPeerConnection();
    t.add_cleanup(() => caller.close());
    const stream = await navigator.mediaDevices.getUserMedia({audio: true});
    t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
    const [track] = stream.getTracks();
    const sender = caller.addTrack(track);
    assert_equals(sender.transport, null);
  }, 'RTCRtpSender.transport is null when unconnected');

  // Test for the simple/happy path of connecting a single track
  promise_test(async t => {
    const caller = new RTCPeerConnection();
    t.add_cleanup(() => caller.close());
    const stream = await navigator.mediaDevices.getUserMedia({audio: true});
    t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
    const [track] = stream.getTracks();
    const sender = caller.addTrack(track);
    const callee = new RTCPeerConnection();
    t.add_cleanup(() => callee.close());
    exchangeIceCandidates(caller, callee);
    await exchangeOfferAndListenToOntrack(t, caller, callee);
    assert_not_equals(sender.transport, null);
    const [transceiver] = caller.getTransceivers();
    assert_equals(transceiver.sender.transport,
                  transceiver.receiver.transport);
    assert_not_equals(sender.transport.iceTransport, null);
  }, 'RTCRtpSender/receiver.transport has a value when connected');

  // Test with multiple tracks, and checking details of when things show up
  // for different bundle policies.
  for (let bundle_policy of ['balanced', 'max-bundle', 'max-compat']) {
    promise_test(async t => {
        const caller = new RTCPeerConnection({bundlePolicy: bundle_policy});
      t.add_cleanup(() => caller.close());
      const stream = await navigator.mediaDevices.getUserMedia(
          {audio: true, video:true});
      t.add_cleanup(() => stream.getTracks().forEach(track => track.stop()));
      const [track1, track2] = stream.getTracks();
      const sender1 = caller.addTrack(track1);
      const sender2 = caller.addTrack(track2);
      const callee = new RTCPeerConnection();
      t.add_cleanup(() => callee.close());
      exchangeIceCandidates(caller, callee);
      const offer = await caller.createOffer();
      assert_equals(sender1.transport, null);
      assert_equals(sender2.transport, null);
      await caller.setLocalDescription(offer);
      assert_not_equals(sender1.transport, null);
      assert_not_equals(sender2.transport, null);
      const [caller_transceiver1, caller_transceiver2] = caller.getTransceivers();
      assert_equals(sender1.transport, caller_transceiver1.sender.transport);
      if (bundle_policy == 'max-bundle') {
        assert_equals(caller_transceiver1.sender.transport,
                      caller_transceiver2.sender.transport);
      } else {
        assert_not_equals(caller_transceiver1.sender.transport,
                          caller_transceiver2.sender.transport);
      }
      await callee.setRemoteDescription(offer);
      const [callee_transceiver1, callee_transceiver2] = callee.getTransceivers();
      // According to spec, setRemoteDescription only updates the transports
      // if the remote description is an answer.
      assert_equals(callee_transceiver1.receiver.transport, null);
      assert_equals(callee_transceiver2.receiver.transport, null);
      const answer = await callee.createAnswer();
      await callee.setLocalDescription(answer);
      assert_not_equals(callee_transceiver1.receiver.transport, null);
      assert_not_equals(callee_transceiver2.receiver.transport, null);
      // At this point, bundle should have kicked in.
      assert_equals(callee_transceiver1.receiver.transport,
                    callee_transceiver2.receiver.transport);
      await caller.setRemoteDescription(answer);
      assert_equals(caller_transceiver1.receiver.transport,
                    caller_transceiver2.receiver.transport);
    }, 'RTCRtpSender/receiver.transport at the right time, with bundle policy ' + bundle_policy);
  }
 </script>