How to use helpers.unlockWithHelperApp method in Appium Android Driver

1var webdriverio = require('webdriverio');2var opts = {3    desiredCapabilities: {4    }5};6var client = webdriverio.remote(opts);7    .init()8    .pause(5000)9    .unlock()10    .end();11helpers.unlockWithHelperApp = function (unlockType, unlockKey) {12    var unlockTypes = ['pin', 'password', 'pattern'];13    if (unlockTypes.indexOf(unlockType) < 0) {14        throw new Error("Invalid unlock type. Only 'pin', 'password', and 'pattern' are supported.");15    }16    var cmd = 'am start -n io.appium.unlock/.Unlock';17    cmd += ' -e unlock_type ' + unlockType;18    cmd += ' -e unlock_key ' + unlockKey;19    return this.adb.shell(cmd);20};21describe('unlockWithHelperApp', function () {22    it('should start unlock helper app', function (done) {23        helpers.unlockWithHelperApp('pin', '1234').then(function (stdout) {24            stdout.should.include('Starting: Intent');25            done();26        });27    });28});29describe('unlock', function () {30    it('should call unlockWithHelperApp', function (done) {31        var unlockWithHelperApp = sinon.stub(helpers, 'unlockWithHelperApp', function () {32            return Q();33        });34        driver.unlock().then(function () {35            unlockWithHelperApp.calledOnce.should.be.true;36            unlockWithHelperApp.calledWithExactly('pin', '1234').should.be.true;37            unlockWithHelperApp.restore();38            done();39        });40    });41});42AndroidDriver.prototype.unlock = function () {

1var helpers = require('./helpers');2helpers.unlockWithHelperApp('com.example.unlockhelper', 'unlockHelperActivity');3exports.unlockWithHelperApp = function (appPackage, appActivity) {4    return driver.startActivity(appPackage, appActivity);5};6var adb = require('adbkit');7var client = adb.createClient();8client.shell('emulator-5554', 'input keyevent 82')9    .then(adb.util.readAll)10    .then(function (output) {11        console.log('[unlock] ' + output.toString().trim());12    })13    .catch(function (err) {14        console.error('ADB Error:', err.stack);15    });