This is a testharness.js-based test.
[FAIL] A worker is able to initialize a MediaStreamTrackGenerator without crashing
  promise_test: Unhandled rejection with value: "Failed with error ReferenceError: MediaStreamTrackGenerator is not defined"
[FAIL] A worker is able to enable a MediaStreamTrackGenerator without crashing
  promise_test: Unhandled rejection with value: "Failed with error ReferenceError: MediaStreamTrackGenerator is not defined"
[FAIL] A worker is able to disable a MediaStreamTrackGenerator without crashing
  promise_test: Unhandled rejection with value: "Failed with error ReferenceError: MediaStreamTrackGenerator is not defined"
Harness: the test ran to completion.