gecko-dev/testing/web-platform/tests/bluetooth/script-tests/service/reconnect-during.js

'use strict';
const test_desc = 'disconnect() and connect() called during ' +
    'FUNCTION_NAME. Reject with NetworkError.';
const expected = new DOMException(
    'GATT Server is disconnected. Cannot retrieve characteristics. ' +
    '(Re)connect first with `device.gatt.connect`.',
    'NetworkError');
let device;

bluetooth_test(() => getHealthThermometerDeviceWithServicesDiscovered({
  filters: [{services: [health_thermometer.name]}],
})
    .then(_ => ({device} = _))
    .then(() => device.gatt.getPrimaryService(health_thermometer.name))
    .then(service => Promise.all([
      // 1. Make a call to service.FUNCTION_NAME, while the service is still
      // valid.
      assert_promise_rejects_with_message(service.CALLS([
        getCharacteristic(measurement_interval.name)|
        getCharacteristics()|
        getCharacteristics(measurement_interval.name)[UUID]
      ]), expected),

      // 2. disconnect() and connect before the initial call completes.
      // This is accomplished by making the calls without waiting for the
      // earlier promises to resolve.
      // connect() guarantees on OS-level connection, but disconnect()
      // only disconnects the current instance.
      // getHealthThermometerDeviceWithServicesDiscovered holds another
      // connection in an iframe, so disconnect() and connect() are certain to
      // reconnect.  However, disconnect() will invalidate the service object so
      // the subsequent calls made to it will fail, even after reconnecting.
      device.gatt.disconnect(),
      device.gatt.connect()
    ])),
    test_desc);