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<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(async t => {
const pc = new RTCPeerConnection()
t.add_cleanup(() => pc.close());
const offer = await pc.createOffer()
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() returns RTCSessionDescriptionInit');
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_equals(pc.pendingLocalDescription, pc.localDescription);
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_dom(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');
/*
If connection's signaling state is neither "stable" nor "have-local-offer", return a promise rejected with a newly created InvalidStateError.
*/
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.setRemoteDescription(offer)
.then(() => {
assert_equals(pc.signalingState, 'have-remote-offer');
return promise_rejects_dom(t, 'InvalidStateError',
pc.createOffer());
})
)
}, 'createOffer() should fail when signaling state is not stable or have-local-offer');
/*
* 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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