chromium/third_party/blink/web_tests/wpt_internal/bluetooth/script-tests/service/device-disconnects-during.js

'use strict';
bluetooth_test(() => {
  return setBluetoothFakeAdapter('DisconnectingHeartRateAdapter')
    .then(() => requestDeviceWithTrustedClick({
      filters: [{services: ['heart_rate']}],
      optionalServices: [request_disconnection_service_uuid]
    }))
    .then(device => device.gatt.connect())
    .then(gatt => {
      let heart_rate_service;
      return gatt.getPrimaryService('heart_rate')
        .then(hrs => heart_rate_service = hrs)
        .then(() => get_request_disconnection(gatt))
        .then(requestDisconnection => {
          requestDisconnection();
          return assert_promise_rejects_with_message(
            heart_rate_service.CALLS([
              getCharacteristic('heart_rate_measurement')|
              getCharacteristics()|
              getCharacteristics('heart_rate_measurement')[UUID]
            ]),
            new DOMException(
              'GATT Server is disconnected. Cannot retrieve characteristics. ' +
              '(Re)connect first with `device.gatt.connect`.',
              'NetworkError'));
        });
    });
}, 'Device disconnects during FUNCTION_NAME call. Reject with NetworkError.');