This is a testharness.js-based test.
Found 9 FAIL, 0 TIMEOUT, 0 NOTRUN.
[FAIL] AudioContext interface: operation createMediaStreamTrackSource(MediaStreamTrack)
  assert_own_property: interface prototype object missing non-static operation expected property "createMediaStreamTrackSource" missing
[FAIL] AudioContext interface: context must inherit property "createMediaStreamTrackSource(MediaStreamTrack)" with the proper type
  assert_inherits: property "createMediaStreamTrackSource" not found in prototype chain
[FAIL] AudioContext interface: calling createMediaStreamTrackSource(MediaStreamTrack) on context with too few arguments must throw TypeError
  assert_inherits: property "createMediaStreamTrackSource" not found in prototype chain
[FAIL] MediaStreamTrackAudioSourceNode interface: existence and properties of interface object
  assert_own_property: self does not have own property "MediaStreamTrackAudioSourceNode" expected property "MediaStreamTrackAudioSourceNode" missing
[FAIL] MediaStreamTrackAudioSourceNode interface object length
  assert_own_property: self does not have own property "MediaStreamTrackAudioSourceNode" expected property "MediaStreamTrackAudioSourceNode" missing
[FAIL] MediaStreamTrackAudioSourceNode interface object name
  assert_own_property: self does not have own property "MediaStreamTrackAudioSourceNode" expected property "MediaStreamTrackAudioSourceNode" missing
[FAIL] MediaStreamTrackAudioSourceNode interface: existence and properties of interface prototype object
  assert_own_property: self does not have own property "MediaStreamTrackAudioSourceNode" expected property "MediaStreamTrackAudioSourceNode" missing
[FAIL] MediaStreamTrackAudioSourceNode interface: existence and properties of interface prototype object's "constructor" property
  assert_own_property: self does not have own property "MediaStreamTrackAudioSourceNode" expected property "MediaStreamTrackAudioSourceNode" missing
[FAIL] MediaStreamTrackAudioSourceNode interface: existence and properties of interface prototype object's @@unscopables property
  assert_own_property: self does not have own property "MediaStreamTrackAudioSourceNode" expected property "MediaStreamTrackAudioSourceNode" missing
Harness: the test ran to completion.