pointerevents/pointerevent_coalesced_movement.https.html

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<html>
<head>
<meta charset="utf-8">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1753724">
<title>pointermove getCoalescedEvents movementX/Y should add up to main event's movementX/Y</title>
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
</head>
<body>
<script>
promise_test(async t => {
  let checks = [];
  function onPointerMove(e) {
      let totalX = 0, totalY = 0;
      for (let coalesced of e.getCoalescedEvents()) {
        totalX += coalesced.movementX;
        totalY += coalesced.movementY;
      }
      checks.push([[totalX, totalY], [e.movementX, e.movementY]]);
  }
  addEventListener('pointermove', onPointerMove);
  t.add_cleanup(() => {
    removeEventListener('pointermove', onPointerMove);
  });
  let actions = new test_driver.Actions();
  await actions
    .pointerMove(30, 30)
    .pointerMove(50, 50)
    .send();
  // If we do the assertions in the callback, the output is a bit weird.
  // So we put the results into an array and check them here.
  for (let [got, expected] of checks) {
    assert_array_equals(got, expected,
          'Coalesced event motion should add up to main event motion');
  }
});
</script>
</body>
</html>