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<!doctype html>
<meta charset=utf-8>
<title>RTCPeerConnection.prototype.createAnswer</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="RTCPeerConnection-helper.js"></script>
<script>
'use strict';
promise_test(async t => {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
await promise_rejects_dom(t, 'InvalidStateError', pc.createAnswer());
}, 'createAnswer() with null remoteDescription should reject with InvalidStateError');
promise_test(async t => {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
const offer = await pc.createOffer();
await pc.setRemoteDescription(offer);
const answer = await pc.createAnswer();
assert_equals(typeof answer, 'object',
'Expect answer to be plain object (dictionary RTCSessionDescriptionInit)');
assert_false(answer instanceof RTCSessionDescription,
'Expect answer to not be instance of RTCSessionDescription');
}, 'createAnswer() returns RTCSessionDescriptionInit');
promise_test(async t => {
const pc = new RTCPeerConnection();
t.add_cleanup(() => pc.close());
// generateDataChannelOffer() is defined in RTCPeerConnection-helper.js.
const offer = await generateDataChannelOffer(pc);
await pc.setRemoteDescription(offer);
pc.close();
await promise_rejects_dom(t, 'InvalidStateError', pc.createAnswer());
}, 'createAnswer() when connection is closed should reject with InvalidStateError');
</script>