PromiseService usage - NO warning

gistfile1.js

define(function (require) {

    var PromiseService = require("services/PromiseService"),
        mockService,
        promiseService,
        promise,
        testRootPath = '/testrootpath/',
        success = false,
        errorReason = false;

    mockService = {};
    // mock call
    mockService.loadRoot = function loadRoot(rootPath, callback) {
    callback(false, true);
    };

    promiseService = new PromiseService(mockService);
  
    promise = promiseService.loadRoot(testRootPath);
    
    promise.then(
        function (result) {
            success = result;
        },
        function (error) {
            errorReason = error;
        }
    );
    
    /* After some async stuff */
    expect(success).toBeTruthy();
    expect(errorReason).toBeFalsy();

});