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chromium/third_party/blink/web_tests/external/wpt/orientation-event/orientation/basic-operation.https.html 

<!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, 'deviceorientation');
  await helper.grantSensorsPermissions();
  await helper.initializeSensors();

  const orientationData = generateOrientationData(1.1, 2.2, 3.3, false);
  await helper.setData(orientationData);
  await waitForEvent(getExpectedOrientationEvent(orientationData));
}, 'Tests basic operation of deviceorientation event using mock data.');

promise_test(async (t) => {
  const helper = new SensorTestHelper(t, 'deviceorientation');
  await helper.grantSensorsPermissions();
  await helper.initializeSensors({disabledSensors: ['relative-orientation']});

  const orientationData = generateOrientationData(null, null, null, false);
  const watcher = new EventWatcher(t, window, ['deviceorientation']);

  const event = await watcher.wait_for('deviceorientation');
  assert_equals(event.type, 'deviceorientation', 'type is set to \"deviceorientation\"');
  assert_true(event instanceof DeviceOrientationEvent, 'event is DeviceOrientationEvent');

  assertEventEquals(event, getExpectedOrientationEvent(orientationData));
}, 'If UA can never provide orientation information, the event should be fired as a null event.');
</script>