the successRedirect in passport authenticate doesn't work

i have a problem with passport a set a local strategy for signing up and and when a user just fill the sign up form (he can write anything ) it should be redirected to another page with successRedirect but when i try it the url stay the same and there is no redirection

this is the strategy :

var passport = require('passport');
var User = require('../models/user');
var LocalStrategy = require('passport-local').Strategy;

passport.serializeUser(function(user, done) {
    done(null, user.id);
});
passport.deserializeUser(function(id, done) {
    User.findById(id, function(err, user) {
        done(err, user);
    });
});
passport.use('local.signup', new LocalStrategy({
    usernameField: 'email',
    passwordField: 'password',
    passReqToCallback: true,

}, function(req, email, password, done) {
    User.findOne({ 'email': email }, function(err, user) {
        if (err) {
            return done(err);
        }
        if (user) {
            return done(null, false, { message: 'Email is already in use' });
        }
        var newUser = new User();
        newUser.email = email;
        newUser.password = newUser.encryptPassword(password);
        newUser.save(function(err, result) {
            if (err) {
                return done(err);
            }
            return done(null, newUser);
        });
    });
}));

this is the routing file where i use the strategy : the router.get('/') and router.get(/user/signup) work well

var express = require('express');
var router = express.Router();
var csrf = require('csurf');
var passport = require('passport');
var Product = require('../models/product');
var csrfProtection = csrf();
router.use(csrfProtection);

/* GET home page. */
router.get('/', function(req, res, next) {
    Product.find(function(err, docs) {
        var productChunks = [];
        var chunkSize = 3;
        for (var i = 0; i < docs.length; i += chunkSize) {
            productChunks.push(docs.slice(i, i + chunkSize));
        }
        res.render('shop/index', { title: 'Express', products: productChunks }); // use the template index in the vieas folder and replace all hooked with the variables in the second parameters 
    });
});
router.get('/user/signup', function(req, res, next) {

    res.render('user/signup', { csrfToken: req.csrfToken() });
});
router.post('/user/signup', passport.authenticate('local.signup', {
    successRedirect: '/user/profile',
    failureRedirect: '/user/signup',
    failureFlash: true

}));
router.get('/user/profile', function(req, res, next) {
    res.render('user/profile');
});
module.exports = router;

this is my app.js file

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var expressHbs = require('express-handlebars');
var session = require('express-session');
var mongoose = require('mongoose');
var passport = require('passport');
var flash = require('connect-flash');
var routes = require('./routes/index');
var app = express();
mongoose.connect('localhost:27017/shopping');
require('./config/passport');

// view engine setup
app.engine('.hbs', expressHbs({ defaultLayout: 'layout', extname: '.hbs' }))
app.set('view engine', '.hbs');

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(session({ secret: '123456789', resave: false, saveUninitialized: false }));
app.use(flash());
app.use(passport.initialize());
app.use(passport.session());
app.use(express.static(path.join(__dirname, 'public')));
app.use('/', routes);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
});

// error handler
app.use(function(err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message;
    res.locals.error = req.app.get('env') === 'development' ? err : {};

    // render the error page
    res.status(err.status || 500);
    res.render('error');
});

module.exports = app;

and this is my user schema

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var bcrypt = require('bcrypt-nodejs');

var userSchema = new Schema({
    email: { type: String, required: true },
    password: { type: String, required: true }

});
userSchema.methods.encryptPassword = function(password) {
    return bcrypt.hashSync(password, bcrypt.genSaltSync(5), null);
}
userSchema.methods.validPassword = function(password) {
    return bcrypt.compareSync(password, this.password);
}
module.exports = mongoose.model('User', userSchema);

via Hachimi Ahmed Amine