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RTCPeerConnection-createOffer.html 
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<meta charset=utf-8>
<title>RTCPeerConnection.prototype.createOffer</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/20170515/webrtc.html

  // The following helper functions are called from RTCPeerConnection-helper.js:
  //   countAudioLine()
  //   countVideoLine()
  //   assert_session_desc_similar()

  /*
   *  4.3.2.  createOffer()
   */

  /*
   *  Final steps to create an offer
   *    4.  Let offer be a newly created RTCSessionDescriptionInit dictionary
   *        with its type member initialized to the string "offer" and its sdp member
   *        initialized to sdpString.
   */
  promise_test(t => {
    const pc = new RTCPeerConnection()

    t.add_cleanup(() => pc.close());

    return pc.createOffer()
    .then(offer => {
      assert_equals(typeof offer, 'object',
        'Expect offer to be plain object dictionary RTCSessionDescriptionInit');

      assert_false(offer instanceof RTCSessionDescription,
        'Expect offer to not be instance of RTCSessionDescription')
    });
  }, 'createOffer() with no argument from newly created RTCPeerConnection should succeed');

  promise_test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());

    const states = [];
    pc.addEventListener('signalingstatechange', () => states.push(pc.signalingState));

    return generateVideoReceiveOnlyOffer(pc)
    .then(offer =>
      pc.setLocalDescription(offer)
      .then(() => {
        assert_equals(pc.signalingState, 'have-local-offer');
        assert_session_desc_similar(pc.localDescription, offer);
        assert_session_desc_similar(pc.pendingLocalDescription, offer);
        assert_equals(pc.currentLocalDescription, null);

        assert_array_equals(states, ['have-local-offer']);
      }));
  }, 'createOffer() and then setLocalDescription() should succeed');

  promise_test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
    pc.close();

    return promise_rejects(t, 'InvalidStateError',
      pc.createOffer());
  }, 'createOffer() after connection is closed should reject with InvalidStateError');

  /*
   *  Final steps to create an offer
   *    2.  If connection was modified in such a way that additional inspection of the
   *        system state is necessary, then in parallel begin the steps to create an
   *        offer again, given p, and abort these steps.
   *
   *  This test might hit step 2 of final steps to create an offer. But the media stream
   *  is likely added already by the time steps to create an offer is executed, because
   *  that is enqueued as an operation.
   *  Either way it verifies that the media stream is included in the offer even though
   *  the stream is added after synchronous call to createOffer.
   */
  promise_test(t => {
    const pc = new RTCPeerConnection();
    t.add_cleanup(() => pc.close());
    const promise = pc.createOffer();

    pc.addTransceiver('audio');
    return promise.then(offer => {
      assert_equals(countAudioLine(offer.sdp), 1,
        'Expect m=audio line to be found in offer SDP')
    });
  }, 'When media stream is added when createOffer() is running in parallel, the result offer should contain the new media stream');

  /*
   *  TODO
   *  4.3.2 createOffer
   *    3.  If connection is configured with an identity provider, and an identity
   *        assertion has not yet been generated using said identity provider, then
   *        begin the identity assertion request process if it has not already begun.
   *    Steps to create an offer
   *    1.  If the need for an identity assertion was identified when createOffer was
   *        invoked, wait for the identity assertion request process to complete.
   *
   *  Non-Testable
   *  4.3.2 createOffer
   *    Steps to create an offer
   *    4.  Inspect the system state to determine the currently available resources as
   *    necessary for generating the offer, as described in [JSEP] (section 4.1.6.).
   *    5.  If this inspection failed for any reason, reject p with a newly created
   *        OperationError and abort these steps.
   */
</script>
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