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chromium/third_party/blink/web_tests/wpt_internal/bluetooth/descriptor/writeValue/write-updates-value.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';
const test_desc = 'Successful write should update descriptor\'s value.';
const newValue = new TextEncoder().encode('foo');
let descriptor, fake_descriptor;

bluetooth_test(() => getUserDescriptionDescriptor()
    .then(_ => ({descriptor, fake_descriptor} = _))
    .then(() => assert_equals(descriptor.value, null))
    .then(() => fake_descriptor.setNextWriteResponse(GATT_SUCCESS))
    .then(() => descriptor.writeValue(newValue))
    .then(() => assert_array_equals(
        new Uint8Array(descriptor.value.buffer), newValue))
    .then(() => fake_descriptor.getLastWrittenValue())
    .then(lastValue => assert_array_equals(lastValue, newValue)),
    test_desc);
</script>