add-listener-from-callback.https.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /orientation-event/motion/add-listener-from-callback.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/resources/testdriver.js"></script>

<script src="/resources/testdriver-vendor.js"></script>

<script src="../resources/orientation-event-helpers.js"></script>

<script>

'use strict';

promise_test(async (t) => {

  const helper = new SensorTestHelper(t, 'devicemotion');

  await helper.grantSensorsPermissions();

  await helper.initializeSensors();

  const motionData = generateMotionData(1.1, 2.1, 3.1,

                                        1.2, 2.2, 3.2,

                                        1.3, 2.3, 3.3);

  let firstListener = null;

  let secondListener = null;

  let firstEventCount = 0;

  let firstPromise = new Promise(resolve => {

    firstListener = (event) => {

      assert_true(event instanceof DeviceMotionEvent, 'event is DeviceMotionEvent');

      assert_equals(event.type, 'devicemotion', 'event.type is devicemotion');

      assert_true(event.target instanceof Window, 'event is fired on the window object');

      assertEventEquals(event, getExpectedMotionEvent(motionData));

      window.removeEventListener('devicemotion', firstListener);

      if (++firstEventCount == 1) {

        window.addEventListener('devicemotion', secondListener);

      resolve(event);

};

});

  let secondEventCount = 0;

  let secondPromise = new Promise(resolve => {

    secondListener = (event) => {

      assertEventEquals(event, getExpectedMotionEvent(motionData));

      window.removeEventListener('devicemotion', secondListener);

      ++secondEventCount;

      resolve(event);

};

});

  await helper.setData(motionData);

  window.addEventListener('devicemotion', firstListener);

  await firstPromise;

  await secondPromise;

  assert_equals(firstEventCount, 1, "Too many events fired for the first listener");

  assert_equals(secondEventCount, 1, "Too many events fired for the second listener");

}, 'Tests that adding a new devicemotion event listener from a callback works as expected.');

</script>