blink/web_tests/external/wpt/bluetooth/script-tests/server/get-same-object.js

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

bluetooth_test(() => getHealthThermometerDevice({
      filters: [{services: ['health_thermometer']}],
      optionalServices: ['generic_access']})
    .then(({device}) => Promise.all([
      device.gatt.CALLS([
        getPrimaryService('health_thermometer')|
        getPrimaryServices()|
        getPrimaryServices('health_thermometer')[UUID]]),
      device.gatt.PREVIOUS_CALL]))
    .then(([services_first_call, services_second_call]) => {
      // Convert to arrays if necessary.
      services_first_call = [].concat(services_first_call);
      services_second_call = [].concat(services_second_call);

      assert_equals(services_first_call.length, services_second_call.length);

      let first_call_set = new Set(services_first_call);
      assert_equals(services_first_call.length, first_call_set.size);
      let second_call_set = new Set(services_second_call);
      assert_equals(services_second_call.length, second_call_set.size);

      services_first_call.forEach(service => {
        assert_true(second_call_set.has(service))
      });

      services_second_call.forEach(service => {
        assert_true(first_call_set.has(service));
      });
    }), test_desc);