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https://github.com/web-platform-tests/wpt
26 December 2018, 22:31:15 UTC
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Tip revision: a50b8dadb93e9a7a20d2e31a7e5d0449ce37cd2c authored by Harald Alvestrand on 22 March 2018, 18:59:43 UTC
Add memory of last SDP offer/answer created
Tip revision: a50b8da
RTCPeerConnection-setLocalDescription.html 
<!doctype html>
<meta charset=utf-8>
<title>RTCPeerConnection.prototype.setLocalDescription</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="RTCPeerConnection-helper.js"></script>
<script>
  'use strict';

  // Test is based on the following editor draft:
  // https://w3c.github.io/webrtc-pc/archives/20170605/webrtc.html

  // The following helper functions are called from RTCPeerConnection-helper.js:
  //   generateOffer
  //   assert_session_desc_not_equals
  //   assert_session_desc_equals
  //   test_state_change_event

  /*
    4.3.2.  Interface Definition
      [Constructor(optional RTCConfiguration configuration)]
      interface RTCPeerConnection : EventTarget {
        Promise<void>                      setRemoteDescription(
            RTCSessionDescriptionInit description);

        readonly attribute RTCSessionDescription? remoteDescription;
        readonly attribute RTCSessionDescription? currentRemoteDescription;
        readonly attribute RTCSessionDescription? pendingRemoteDescription;
        ...
      };

    4.6.2.  RTCSessionDescription Class
      dictionary RTCSessionDescriptionInit {
        required RTCSdpType type;
                 DOMString  sdp = "";
      };

    4.6.1.  RTCSdpType
      enum RTCSdpType {
        "offer",
        "pranswer",
        "answer",
        "rollback"
      };
   */

  promise_test(t => {
    const pc = new RTCPeerConnection();
    test_state_change_event(t, pc, ['have-local-offer', 'stable', 'have-local-offer']);

    return pc.createOffer({ offerToReceiveAudio: true })
    .then(offer1 =>
      pc.setLocalDescription(offer1)
      .then(() => generateAnswer(offer1))
      .then(answer => pc.setRemoteDescription(answer))
      .then(() => {
        pc.createDataChannel('test');
        return pc.createOffer({ offerToReceiveVideo: true });
      })
      .then(offer2 =>
        pc.setLocalDescription(offer2)
        .then(() => {
          assert_equals(pc.signalingState, 'have-local-offer');
          assert_session_desc_not_equals(offer1, offer2);
          assert_session_desc_equals(pc.localDescription, offer2);
          assert_session_desc_equals(pc.currentLocalDescription, offer1);
          assert_session_desc_equals(pc.pendingLocalDescription, offer2);
        })));
  }, 'Calling createOffer() and setLocalDescription() again after one round of local-offer/remote-answer should succeed');

  promise_test(t => {
    const pc = new RTCPeerConnection();
    test_state_change_event(t, pc,
      ['have-remote-offer', 'stable', 'have-local-offer']);

    return generateOffer({ pc, data: true })
    .then(offer => pc.setRemoteDescription(offer))
    .then(() => pc.createAnswer())
    .then(answer =>
      pc.setLocalDescription(answer)
      .then(() => pc.createOffer({ offerToReceiveVideo: true }))
      .then(offer =>
        pc.setLocalDescription(offer)
        .then(() => {
          assert_equals(pc.signalingState, 'have-local-offer');
          assert_session_desc_equals(pc.localDescription, offer);
          assert_session_desc_equals(pc.currentLocalDescription, answer);
          assert_session_desc_equals(pc.pendingLocalDescription, offer);
        })));

  }, 'Switching role from answerer to offerer after going back to stable state should succeed');

  /*
    TODO
      4.3.2.  setLocalDescription
        4.  If description.sdp is null and description.type is pranswer, set description.sdp
            to lastAnswer.
        7.  If description.type is pranswer and description.sdp does not match lastAnswer,
            reject the promise with a newly created InvalidModificationError and abort these
            steps.
   */

</script>
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