<!DOCTYPE html>
<meta charset=utf-8>
<title>Animation.ready</title>
<link rel="help" href="https://drafts.csswg.org/web-animations/#dom-animation-ready">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../../testcommon.js"></script>
<body>
<div id="log"></div>
<script>
'use strict';

promise_test(t => {
  const div = createDiv(t);
  const animation = div.animate(null, 100 * MS_PER_SEC);
  const originalReadyPromise = animation.ready;
  let pauseReadyPromise;

  return animation.ready.then(() => {
    assert_equals(animation.ready, originalReadyPromise,
                  'Ready promise is the same object when playing completes');
    animation.pause();
    assert_not_equals(animation.ready, originalReadyPromise,
                      'A new ready promise is created when pausing');
    pauseReadyPromise = animation.ready;
    // Wait for the promise to fulfill since if we abort the pause the ready
    // promise object is reused.
    return animation.ready;
  }).then(() => {
    animation.play();
    assert_not_equals(animation.ready, pauseReadyPromise,
                      'A new ready promise is created when playing');
  });
}, 'A new ready promise is created when play()/pause() is called');

promise_test(t => {
  const div = createDiv(t);
  const animation = div.animate(null, 100 * MS_PER_SEC);

  return animation.ready.then(() => {
    const promiseBeforeCallingPlay = animation.ready;
    animation.play();
    assert_equals(animation.ready, promiseBeforeCallingPlay,
                  'Ready promise has same object identity after redundant call'
                  + ' to play()');
  });
}, 'Redundant calls to play() do not generate new ready promise objects');

promise_test(t => {
  const div = createDiv(t);
  const animation = div.animate(null, 100 * MS_PER_SEC);

  return animation.ready.then(resolvedAnimation => {
    assert_equals(resolvedAnimation, animation,
                  'Object identity of Animation passed to Promise callback'
                  + ' matches the Animation object owning the Promise');
  });
}, 'The ready promise is fulfilled with its Animation');

promise_test(async t => {
  const animation = createDiv(t).animate(null, 100 * MS_PER_SEC);

  // Ensure the ready promise is created
  const ready = animation.ready;

  window.addEventListener(
    'unhandledrejection',
    t.unreached_func('Should not get an unhandled rejection')
  );

  animation.cancel();

  // Wait a moment to allow a chance for the event to be dispatched.
  await waitForAnimationFrames(2);
}, 'The ready promise does not report an unhandledrejection when rejected');

</script>
</body>
