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chromium/third_party/blink/web_tests/wpt_internal/bluetooth/service/getCharacteristics/correct-characteristics.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>
'use strict';
bluetooth_test(() => {
  return setBluetoothFakeAdapter('HeartRateAdapter')
    .then(() => requestDeviceWithTrustedClick({
      filters: [{services: ['heart_rate']}]}))
    .then(device => device.gatt.connect())
    .then(gattServer => gattServer.getPrimaryService('heart_rate'))
    .then(service => service.getCharacteristics('body_sensor_location'))
    .then(characteristics => {
      let body_sensor_location_chest = characteristics[0];
      let body_sensor_location_wrist = characteristics[1];
      return body_sensor_location_chest.readValue()
        .then(value => {
          assert_equals(value.byteLength, 1);
          assert_equals(value.getUint8(0), 1 /* chest */);
        })
        .then(() => body_sensor_location_wrist.readValue())
        .then(value => {
          assert_equals(value.byteLength, 1);
          assert_equals(value.getUint8(0), 2 /* wrist */);
        });
    });
}, 'Find characteristics with UUID in service.');
</script>