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chromium/third_party/blink/web_tests/wpt_internal/bluetooth/characteristic/notifications/gc-with-pending-stop.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="/bluetooth/resources/bluetooth-test.js"></script>
<script src="/bluetooth/resources/bluetooth-fake-devices.js"></script>
<script src="/common/gc.js"></script>
<script>
'use strict';
bluetooth_test(() => {
  let stop_promise;
  return setBluetoothFakeAdapter('HeartRateAdapter')
    .then(() => requestDeviceWithTrustedClick({
      filters: [{services: ['heart_rate']}]}))
    .then(device => device.gatt.connect())
    .then(gattServer => gattServer.getPrimaryService('heart_rate'))
    .then(service => service.getCharacteristic('heart_rate_measurement'))
    .then(characteristic => {
      return characteristic.startNotifications().then(() => {
        stop_promise = characteristic.stopNotifications();
        // We intentionally don't return the promise so that 'characteristic'
        // goes out of scope while the request is still pending.
      });
    })
    .then(() => garbageCollect())
    .then(() => stop_promise);
  // TODO(ortuno): Assert that notifications are not active.
  // http://crbug.com/600762
}, 'Object gets garbage collected while stop request is pending. Make sure ' +
   'we don\'t crash while the request is pending.');
</script>