This is a testharness.js-based test.
[FAIL] enumerateDevices() returns no audiooutput devices before permission grant
  assert_equals: number of audiooutput devices. expected 0 but got 3
[FAIL] selectAudioOutput()
  promise_test: Unhandled rejection with value: object "NotAllowedError: Permission denied to select audio output."
[FAIL] enumerateDevices() after selectAudioOutput()
  assert_equals: number of audiooutput devices. expected 1 but got 3
Harness: the test ran to completion.