servo/tests/wpt/web-platform-tests/bluetooth/script-tests/characteristic/descriptor-get-same-object.js

'use strict';
const test_desc = 'Calls to FUNCTION_NAME should return the same object.';
let characteristic;

bluetooth_test(() => getMeasurementIntervalCharacteristic()
    .then(_ => ({characteristic} = _))
    .then(() => Promise.all([
      characteristic.CALLS([
        getDescriptor(user_description.alias)|
        getDescriptors(user_description.alias)
      ]),
      characteristic.FUNCTION_NAME(user_description.name),
      characteristic.FUNCTION_NAME(user_description.uuid)
    ]))
    .then(descriptors_arrays => {
      assert_true(descriptors_arrays.length > 0)

      // Convert to arrays if necessary.
      for (let i = 0; i < descriptors_arrays.length; i++) {
        descriptors_arrays[i] = [].concat(descriptors_arrays[i]);
      }

      for (let i = 1; i < descriptors_arrays.length; i++) {
        assert_equals(descriptors_arrays[0].length,
            descriptors_arrays[i].length);
      }

      let base_set = new Set(descriptors_arrays[0]);
      for (let descriptors of descriptors_arrays) {
        descriptors.forEach(descriptor => assert_true(base_set.has(descriptor)));
      }
    }), test_desc);