<!DOCTYPE html>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<script src="../../../resources/bluetooth/bluetooth-helpers.js"></script>
<script>
'use strict';
promise_test(() => {
  return setBluetoothFakeAdapter('HeartRateAdapter')
    .then(() => requestDeviceWithKeyDown({
      filters: [{services: ['heart_rate']}],
      optionalServices: ['generic_access']}))
    .then(device => device.gatt.connect())
    .then(gattServer => gattServer.getPrimaryService('generic_access'))
    .then(service => service.getCharacteristic('gap.device_name'))
    .then(characteristic => {
      assert_equals(characteristic.value, null);
      let textEncoder = new TextEncoder();
      let newValue = textEncoder.encode('foo');
      return characteristic.writeValue(newValue).then(() => {
        assert_array_equals(new Uint8Array(characteristic.value.buffer),
                            new Uint8Array(newValue.buffer));
      });
    });
}, 'A regular write request to a writable characteristic should update value.');
</script>