// User.js
    class User{
    async _getUser(client, email) {
            let result = await new userApi().getUser(new UserInfo(email, email));
            console.log('Get result ' + JSON.stringify(result));
            let user = result.users[0];

            console.log('Get User ' + JSON.stringify(user));
            return user;
        }
} module.exports = User;

// Usertest.js
const chai = require('chai');
const sinon = require('sinon');
var chaiAsPromised = require('chai-as-promised');
chai.use(chaiAsPromised).should();
const expect = chai.expect;
    const UserInfo = require('../src/model/userInfo');
    const User = require('../src/model/user');
    describe('Test LogInCommand',function(){
            let user,
            sandbox;
     beforeEach(() => {
            sandbox = sinon.sandbox.create();
            user= new user();

        });
     afterEach(function afterEach() {
            sandbox.restore();
        });
       let User= new UserInfo('email','email');
             sandbox.stub(userApi,'getUser').withArgs(User).returns(Promise.resolve({
                users:[{
                    id:1
                }]
            }));

            let result=  await user._getUser(client,'email');
            console.log('RESULT=>'+result);
    })