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chromium/third_party/blink/web_tests/wpt_internal/bluetooth/characteristic/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 = 'A regular write request to a writable characteristic ' +
    'should update value.';
const newValue = new TextEncoder().encode('foo');
let characteristic, fake_characteristic;

bluetooth_test(() => getMeasurementIntervalCharacteristic()
    .then(_ => ({characteristic, fake_characteristic} = _))
    .then(() => assert_equals(characteristic.value, null))
    .then(() => fake_characteristic.setNextWriteResponse({GATT_SUCCESS}))
    .then(() => characteristic.writeValue(newValue))
    .then(() => assert_array_equals(
        new Uint8Array(characteristic.value.buffer), newValue))
    .then(() => fake_characteristic.getLastWrittenValue())
    .then(({lastValue, lastWriteType}) => {
      assert_array_equals(lastValue, newValue);
      assert_equals(lastWriteType, 'default-deprecated');
    }),
    test_desc);
</script>