prompt-and-cancel-selection-manual.html

<!DOCTYPE html>
<html>
  <title>
    Test that the Promise returned by prompt() is rejected when user cancels device selection
  </title>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script src="/common/media.js"></script>
  <script>
    setup({ explicit_timeout: true });
  </script>
  <body>
    <p>
      Click the button below to prompt for a remote playback device and
      <b>cancel the selection</b> of a device!
    </p>
    <button id="prompt-button">Pick device</button>
  </body>
  <script>
    async_test(t => {
      let v = document.createElement("video");
      v.src = getVideoURI("/media/movie_5");

      let button = document.getElementById("prompt-button");
      button.onclick = t.step_func(() =>
        v.remote
          .prompt()
          .then(t.unreached_func())
          .catch(
            t.step_func_done(error =>
              assert_equals(error.name, "NotAllowedError")
            )
          )
      );
    }, "Test that the Promise returned by prompt() is rejected when user cancels device selection.");
  </script>
</html>

chromium/third_party/blink/web_tests/external/wpt/remote-playback/prompt-and-cancel-selection-manual.html