watch-availability-promise-return-callback-id.html

<!DOCTYPE html>
<html>
  <title>
    Test that the Promise returned by watchAvailability() resolves with a numeric callback id
  </title>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script src="/common/media.js"></script>
  <script>
    async_test(t => {
      let v = document.createElement("video");
      v.src = getVideoURI("/media/movie_5");

      v.remote
        .watchAvailability(() => {})
        .then(
          t.step_func_done(callbackId => {
            assert_true(typeof callbackId === "number");
          }),
          t.unreached_func()
        );
    }, "Test that the Promise returned by watchAvailability() resolves with a numeric callback id.");
  </script>
</html>

chromium/third_party/blink/web_tests/external/wpt/remote-playback/watch-availability-promise-return-callback-id.html