Bug 1864812 [wpt PR 43166] - Add tests for w3c/webrtc-pc#2691, a=test…

…only

Automatic update from web-platform-tests
Add tests for w3c/webrtc-pc#2691 (#43166)

* Add tests for w3c/webrtc-pc#2691

https://github.com/web-platform-tests/wpt/blob/8347f5b483e3b713443d06638d3662457107b3b0/webrtc/RTCConfiguration-bundlePolicy.html#L67 already tests it for bundlePolicy
https://github.com/web-platform-tests/wpt/blob/8347f5b483e3b713443d06638d3662457107b3b0/webrtc/RTCConfiguration-iceTransportPolicy.html#L84C5-L84C68 tests it for iceTransportPolicy
This adds the relevant test for rtcpMuxPolicy

* Fix lint
--

wpt-commits: ae97638a3c85516ecfa82141e47c52ca2629eecf
wpt-pr: 43166

testing/web-platform/tests/webrtc/RTCConfiguration-rtcpMuxPolicy.html

@@ -114,6 +114,14 @@
 
   }, `setConfiguration({ rtcpMuxPolicy: 'require' }) with initial rtcpMuxPolicy negotiate should throw InvalidModificationError`);
 
+  test(() => {
+    let pc;
+    pc = new RTCPeerConnection({ rtcpMuxPolicy: 'require' });
+    // default rtcpMuxPolicy is 'require', so this is allowed
+    pc.setConfiguration({});
+    assert_equals(pc.getConfiguration().rtcpMuxPolicy, 'require');
+  }, `setConfiguration({}) with initial rtcpMuxPolicy require should leave rtcpMuxPolicy to require`);
+
   test(() => {
     let pc;
     try {