diff --git a/testing/web-platform/tests/webrtc/RTCRtpEncodingParameters-codec-opus-stereo.https.html b/testing/web-platform/tests/webrtc/RTCRtpEncodingParameters-codec-opus-stereo.https.html index 49335eada4ff..d38b3279b85e 100644 --- a/testing/web-platform/tests/webrtc/RTCRtpEncodingParameters-codec-opus-stereo.https.html +++ b/testing/web-platform/tests/webrtc/RTCRtpEncodingParameters-codec-opus-stereo.https.html @@ -69,9 +69,11 @@ const audio = document.createElement('audio'); audio.srcObject = new MediaStream(); audio.srcObject.addTrack(remoteTrack); - assert_equals(await pollChannelCount(t, remoteTrack), 1, - 'Remote track is also mono'); -}, 'Sending and receiving a mono track with opus'); + // The stereo opus decoder outputs stereo regardless of the signal on the + // wire. + assert_equals(await pollChannelCount(t, remoteTrack), 2, + 'Remote track is stereo (despite local track being mono)'); +}, 'Sending and receiving a mono track with opus (stereo decoder upmix)'); promise_test(async t => { const pc1 = new RTCPeerConnection();