diff --git a/.gitignore b/.gitignore
index 41195164..0f57c731 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,7 @@
 
 node_modules/
 
+coverage/
+
+*.swp
+
diff --git a/app/index.js b/app/index.js
deleted file mode 100644
index 695502f1..00000000
--- a/app/index.js
+++ /dev/null
@@ -1,37 +0,0 @@
-
-var express = require('express');
-var bodyParser = require('body-parser');
-var cookieParser = require('cookie-parser');
-var routes = require('./lib/routes');
-var ldap = require('ldapjs');
-var speakeasy = require('speakeasy');
-
-var totpSecret = process.env.SECRET;
-var LDAP_URL = process.env.LDAP_URL || 'ldap://127.0.0.1:389';
-var USERS_DN = process.env.USERS_DN;
-var PORT = process.env.PORT || 80
-var JWT_SECRET = 'this is the secret';
-var EXPIRATION_TIME = process.env.EXPIRATION_TIME || '1h';
-
-var ldap_client = ldap.createClient({
-  url: LDAP_URL
-});
-
-
-var app = express();
-app.use(cookieParser());
-app.use(express.static(__dirname + '/public_html'));
-app.use(bodyParser.urlencoded({ extended: false }));
-
-app.set('view engine', 'ejs');
-
-app.get  ('/login',   routes.login);
-app.post ('/login',   routes.login);
-
-app.get  ('/logout',  routes.logout);
-app.get  ('/_auth',   routes.auth);
-
-app.listen(PORT, function(err) {
-  console.log('Listening on %d...', PORT);
-});
-
diff --git a/package.json b/package.json
index 8dd740e3..1bd63959 100644
--- a/package.json
+++ b/package.json
@@ -2,9 +2,10 @@
   "name": "ldap-totp-nginx-auth",
   "version": "1.0.0",
   "description": "",
-  "main": "app/index.js",
+  "main": "src/index.js",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "./node_modules/.bin/mocha",
+    "coverage": "./node_modules/.bin/istanbul cover _mocha -- -R spec"
   },
   "repository": {
     "type": "git",
@@ -29,6 +30,7 @@
   },
   "devDependencies": {
     "mocha": "^3.2.0",
+    "request": "^2.79.0",
     "should": "^11.1.1",
     "sinon": "^1.17.6",
     "sinon-promise": "^0.1.3"
diff --git a/src/index.js b/src/index.js
new file mode 100644
index 00000000..1e540891
--- /dev/null
+++ b/src/index.js
@@ -0,0 +1,20 @@
+
+var server = require('./lib/server');
+
+var ldap = require('ldapjs');
+
+var config = {
+  port: process.env.PORT || 8080
+  totp_secret: process.env.TOTP_SECRET,
+  ldap_url: process.env.LDAP_URL || 'ldap://127.0.0.1:389',
+  ldap_users_dn: process.env.LDAP_USERS_DN,
+  jwt_secret: process.env.JWT_SECRET,
+  jwt_expiration_time: process.env.JWT_EXPIRATION_TIME || '1h'
+}
+
+var ldap_client = ldap.createClient({
+  url: config.ldap_url
+});
+
+server.run(config, ldap_client);
+
diff --git a/app/lib/authentication.js b/src/lib/authentication.js
similarity index 55%
rename from app/lib/authentication.js
rename to src/lib/authentication.js
index 3c276b3a..cf8e66f1 100644
--- a/app/lib/authentication.js
+++ b/src/lib/authentication.js
@@ -1,11 +1,10 @@
 
 module.exports = {
   'authenticate': authenticate,
-  'verify_authentication': verify_authentication
+  'verify': verify_authentication
 }
 
 var objectPath = require('object-path');
-var Jwt = require('./jwt');
 var ldap_checker = require('./ldap_checker');
 var totp_checker = require('./totp_checker');
 var replies = require('./replies');
@@ -13,38 +12,42 @@ var Q = require('q');
 var utils = require('./utils');
 
 
-function authenticate(req, res, args) {
+function authenticate(req, res) {
   var defer = Q.defer();
   var username = req.body.username;
   var password = req.body.password;
   var token = req.body.token;
-  console.log('Start authentication');
+  console.log('Start authentication of user %s', username);
 
   if(!username || !password || !token) {
     replies.authentication_failed(res);
     return;
   }
 
-  var totp_promise = totp_checker.validate(args.totp_interface, token, args.totp_secret);
-  var credentials_promise = ldap_checker.validate(args.ldap_interface, username, password, args.users_dn);
+  var jwt_engine = req.app.get('jwt engine');
+  var ldap_client = req.app.get('ldap client');
+  var totp_engine = req.app.get('totp engine');
+  var config = req.app.get('config');
+
+  var totp_promise = totp_checker.validate(totp_engine, token, config.totp_secret);
+  var credentials_promise = ldap_checker.validate(ldap_client, username, password, config.ldap_users_dn);
 
   Q.all([totp_promise, credentials_promise])
   .then(function() {
-    var token = args.jwt.sign({ user: username }, args.jwt_expiration_time);
-    res.cookie('access_token', token);
-    res.redirect('/');
+    var token = jwt_engine.sign({ user: username }, config.jwt_expiration_time);
+    replies.authentication_succeeded(res, username, token);
     console.log('Authentication succeeded');
     defer.resolve();
   })
   .fail(function(err1, err2) {
-    res.render('login');
     console.log('Authentication failed', err1, err2);
+    replies.authentication_failed(res);
     defer.reject();
   });
   return defer.promise;
 }
 
-function verify_authentication(req, res, args) {
+function verify_authentication(req, res) {
   console.log('Verify authentication');
 
   if(!objectPath.has(req, 'cookies.access_token')) {
@@ -52,6 +55,6 @@ function verify_authentication(req, res, args) {
   }
 
   var jsonWebToken = req.cookies['access_token'];
-  return args.jwt.verify(jsonWebToken);
+  return req.app.get('jwt engine').verify(jsonWebToken);
 }
 
diff --git a/app/lib/jwt.js b/src/lib/jwt.js
similarity index 100%
rename from app/lib/jwt.js
rename to src/lib/jwt.js
diff --git a/app/lib/ldap_checker.js b/src/lib/ldap_checker.js
similarity index 100%
rename from app/lib/ldap_checker.js
rename to src/lib/ldap_checker.js
diff --git a/app/lib/replies.js b/src/lib/replies.js
similarity index 69%
rename from app/lib/replies.js
rename to src/lib/replies.js
index f60199a1..a68d74fa 100644
--- a/app/lib/replies.js
+++ b/src/lib/replies.js
@@ -11,19 +11,17 @@ function authentication_failed(res) {
   res.send('Authentication failed');
 }
 
-function send_success(res, username, msg) {
+function authentication_succeeded(res, username, token) {
+  console.log('Reply: authentication succeeded');
   res.status(200);
   res.set({ 'X-Remote-User': username });
-  res.send(msg);
-}
-
-function authentication_succeeded(res, username) {
-  console.log('Reply: authentication succeeded');
-  send_success(res, username, 'Authentication succeeded');
+  res.send(token);
 }
 
 function already_authenticated(res, username) {
   console.log('Reply: already authenticated');
-  send_success(res, username, 'Authentication succeeded');
+  res.status(204);
+  res.set({ 'X-Remote-User': username });
+  res.send();
 }
 
diff --git a/app/lib/routes.js b/src/lib/routes.js
similarity index 75%
rename from app/lib/routes.js
rename to src/lib/routes.js
index cadcd116..cd8f2b59 100644
--- a/app/lib/routes.js
+++ b/src/lib/routes.js
@@ -9,6 +9,15 @@ var authentication = require('./authentication');
 var replies = require('./replies');
 
 function serveAuth(req, res) {
+  if(req.method == 'POST') {
+    serveAuthPost(req, res);
+  }
+  else {
+    serveAuthGet(req, res);
+  }
+}
+
+function serveAuthGet(req, res) {
   authentication.verify(req, res)
   .then(function(user) {
     replies.already_authenticated(res, user);
@@ -19,14 +28,12 @@ function serveAuth(req, res) {
   });
 }
 
+function serveAuthPost(req, res) {
+  authentication.authenticate(req, res);
+}
+
 function serveLogin(req, res) {
-  console.log('METHOD=%s', req.method);
-  if(req.method == 'POST') {
-    authentication.authenticate(req, res);
-  }
-  else {
-    res.render('login');
-  }
+  res.render('login');
 }
 
 function serveLogout(req, res) {
diff --git a/src/lib/server.js b/src/lib/server.js
new file mode 100644
index 00000000..f73159c9
--- /dev/null
+++ b/src/lib/server.js
@@ -0,0 +1,37 @@
+
+module.exports = {
+  run: run
+}
+
+var routes = require('./routes');
+var Jwt = require('./jwt');
+
+var express = require('express');
+var bodyParser = require('body-parser');
+var cookieParser = require('cookie-parser');
+var speakeasy = require('speakeasy');
+
+function run(config, ldap_client) {
+  var app = express();
+  app.set('views', './src/views');
+  app.use(cookieParser());
+  app.use(express.static(__dirname + '/public_html'));
+  app.use(bodyParser.urlencoded({ extended: false }));
+  
+  app.set('view engine', 'ejs');
+
+  app.set('jwt engine', new Jwt(config.jwt_secret));
+  app.set('ldap client', ldap_client);
+  app.set('totp engine', speakeasy);
+  app.set('config', config);
+  
+  app.get  ('/login',   routes.login);
+  app.get  ('/logout',  routes.logout);
+
+  app.get  ('/_auth',   routes.auth);
+  app.post ('/_auth',   routes.auth);
+  
+  app.listen(config.port, function(err) {
+    console.log('Listening on %d...', config.port);
+  });
+}
diff --git a/app/lib/totp_checker.js b/src/lib/totp_checker.js
similarity index 75%
rename from app/lib/totp_checker.js
rename to src/lib/totp_checker.js
index 24c061d9..a68c1235 100644
--- a/app/lib/totp_checker.js
+++ b/src/lib/totp_checker.js
@@ -5,9 +5,9 @@ module.exports = {
 
 var Q = require('q');
 
-function validate(speakeasy, token, totp_secret) {
+function validate(totp_engine, token, totp_secret) {
   var defer = Q.defer(); 
-  var real_token = speakeasy.totp({
+  var real_token = totp_engine.totp({
     secret: totp_secret,
     encoding: 'base32'
   });
diff --git a/app/lib/utils.js b/src/lib/utils.js
similarity index 100%
rename from app/lib/utils.js
rename to src/lib/utils.js
diff --git a/app/public_html/login.css b/src/public_html/login.css
similarity index 100%
rename from app/public_html/login.css
rename to src/public_html/login.css
diff --git a/app/views/login.ejs b/src/views/login.ejs
similarity index 100%
rename from app/views/login.ejs
rename to src/views/login.ejs
diff --git a/app/tests/authentication_test.js b/test/authentication_test.js
similarity index 70%
rename from app/tests/authentication_test.js
rename to test/authentication_test.js
index 7e27b699..00eb6e95 100644
--- a/app/tests/authentication_test.js
+++ b/test/authentication_test.js
@@ -1,6 +1,6 @@
 
 var assert = require('assert');
-var authentication = require('../lib/authentication');
+var authentication = require('../src/lib/authentication');
 var create_res_mock = require('./res_mock');
 var sinon = require('sinon');
 var sinonPromise = require('sinon-promise');
@@ -17,6 +17,9 @@ function create_req_mock(token) {
     },
     cookies: {
       'access_token': 'cookie_token'
+    },
+    app: {
+      get: sinon.stub()
     }
   }
 }
@@ -55,6 +58,14 @@ function create_mocks() {
     totp_interface: totp_interface_mock
   }
 
+  req_mock.app.get.withArgs('ldap client').returns(args.ldap_interface);
+  req_mock.app.get.withArgs('jwt engine').returns(args.jwt);
+  req_mock.app.get.withArgs('totp engine').returns(args.totp_interface);
+  req_mock.app.get.withArgs('config').returns({
+    totp_secret: 'totp_secret',
+    ldap_users_dn: 'ou=users,dc=example,dc=com'
+  });
+
   return {
     req: req_mock, 
     res: res_mock, 
@@ -70,11 +81,11 @@ describe('test jwt', function() {
       var jwt_token = 'jwt_token';
       var clock = sinon.useFakeTimers();
       var mocks = create_mocks();
-      authentication.authenticate(mocks.req, mocks.res, mocks.args)
+      authentication.authenticate(mocks.req, mocks.res)
       .then(function() {
         clock.restore();
-        assert(mocks.res.cookie.calledWith('access_token', jwt_token));
-        assert(mocks.res.redirect.calledWith('/'));
+        assert(mocks.res.status.calledWith(200));
+        assert(mocks.res.send.calledWith(jwt_token));
         done();
       })
     });
@@ -83,7 +94,7 @@ describe('test jwt', function() {
       var clock = sinon.useFakeTimers();
       var mocks = create_mocks();
       mocks.totp.returns('wrong token');
-      authentication.authenticate(mocks.req, mocks.res, mocks.args)
+      authentication.authenticate(mocks.req, mocks.res)
       .fail(function(err) {
         clock.restore();
         done();
@@ -96,8 +107,11 @@ describe('test jwt', function() {
     it('should be already authenticated', function(done) {
       var mocks = create_mocks();
       var data = { user: 'username' };
-      mocks.jwt.verify = sinon.promise().resolves(data);
-      authentication.verify_authentication(mocks.req, mocks.res, mocks.args)
+      mocks.req.app.get.withArgs('jwt engine').returns({
+        verify: sinon.promise().resolves(data)
+      });
+
+      authentication.verify(mocks.req, mocks.res)
       .then(function(actual_data) {
         assert.equal(actual_data, data);
         done();
@@ -107,8 +121,10 @@ describe('test jwt', function() {
     it('should not be already authenticated', function(done) {
       var mocks = create_mocks();
       var data = { user: 'username' };
-      mocks.jwt.verify = sinon.promise().rejects('Error with JWT token');
-      return authentication.verify_authentication(mocks.req, mocks.res, mocks.args)
+      mocks.req.app.get.withArgs('jwt engine').returns({
+        verify: sinon.promise().rejects('Error with JWT token')
+      });
+      return authentication.verify(mocks.req, mocks.res, mocks.args)
       .fail(function() {
         done();
       });
diff --git a/app/tests/jwt_test.js b/test/jwt_test.js
similarity index 95%
rename from app/tests/jwt_test.js
rename to test/jwt_test.js
index 45e6b603..30cef7d9 100644
--- a/app/tests/jwt_test.js
+++ b/test/jwt_test.js
@@ -1,5 +1,5 @@
 
-var Jwt = require('../lib/jwt');
+var Jwt = require('../src/lib/jwt');
 var sinon = require('sinon');
 var sinonPromise = require('sinon-promise');
 sinonPromise(sinon);
diff --git a/app/tests/ldap_checker_test.js b/test/ldap_checker_test.js
similarity index 94%
rename from app/tests/ldap_checker_test.js
rename to test/ldap_checker_test.js
index 7a672fe7..db3b82fe 100644
--- a/app/tests/ldap_checker_test.js
+++ b/test/ldap_checker_test.js
@@ -1,5 +1,5 @@
 
-var ldap_checker = require('../lib/ldap_checker');
+var ldap_checker = require('../src/lib/ldap_checker');
 var sinon = require('sinon');
 var sinonPromise = require('sinon-promise');
 
diff --git a/app/tests/replies_test.js b/test/replies_test.js
similarity index 93%
rename from app/tests/replies_test.js
rename to test/replies_test.js
index 4c88f3fd..c7ea98d1 100644
--- a/app/tests/replies_test.js
+++ b/test/replies_test.js
@@ -1,5 +1,5 @@
 
-var replies = require('../lib/replies');
+var replies = require('../src/lib/replies');
 var assert = require('assert');
 var sinon = require('sinon');
 var sinonPromise = require('sinon-promise');
@@ -36,7 +36,7 @@ describe('test jwt', function() {
 
     replies.already_authenticated(res_mock, username);
 
-    assert(res_mock.status.calledWith(200));
+    assert(res_mock.status.calledWith(204));
     assert(res_mock.set.calledWith({'X-Remote-User': username }));
   });
 
diff --git a/app/tests/res_mock.js b/test/res_mock.js
similarity index 100%
rename from app/tests/res_mock.js
rename to test/res_mock.js
diff --git a/test/test_server.js b/test/test_server.js
new file mode 100644
index 00000000..7f9f496d
--- /dev/null
+++ b/test/test_server.js
@@ -0,0 +1,86 @@
+
+var request = require('request');
+var assert = require('assert');
+var server = require('../src/lib/server');
+var Jwt = require('../src/lib/jwt');
+var speakeasy = require('speakeasy');
+var sinon = require('sinon');
+
+describe('test the server', function() {
+  var jwt = new Jwt('jwt_secret');
+  var ldap_client = {
+    bind: sinon.mock()
+  };
+
+  before(function() {
+    var config = {
+      port: 8080,
+      totp_secret: 'totp_secret',
+      ldap_url: 'ldap://127.0.0.1:389',
+      ldap_users_dn: 'ou=users,dc=example,dc=com',
+      jwt_secret: 'jwt_secret',
+      jwt_expiration_time: '1h'
+    };
+
+    // ldap_client.bind.yields(undefined);
+    ldap_client.bind.withArgs('cn=test_ok,ou=users,dc=example,dc=com', 
+                              'password').yields(undefined);
+    // ldap_client.bind.withArgs('cn=test_nok,ou=users,dc=example,dc=com', 
+    //                           'password').yields(undefined, 'error');
+    server.run(config, ldap_client);
+  });
+
+  it('should serve the login page', function(done) {
+    request.get('http://localhost:8080/login')
+    .on('response', function(response) {
+      assert.equal(response.statusCode, 200);
+      done();
+    }) 
+  });
+ 
+  it('should return status code 401 when user is not authenticated', function(done) {
+    request.get('http://localhost:8080/_auth')
+    .on('response', function(response) {
+      assert.equal(response.statusCode, 401);
+      done();
+    }) 
+  });
+
+  it('should return status code 204 when user is authenticated', function(done) {
+    var j = request.jar();
+    var r = request.defaults({jar: j});
+    var token = jwt.sign({ user: 'test' }, '1h');
+    var cookie = r.cookie('access_token=' + token);
+    j.setCookie(cookie, 'http://localhost:8080/_auth');
+
+    r.get('http://localhost:8080/_auth')
+    .on('response', function(response) {
+      assert.equal(response.statusCode, 204);
+      done();
+    }) 
+  });
+
+  it('should return the JWT token when authentication is successful', function(done) {
+    var clock = sinon.useFakeTimers();
+    var real_token = speakeasy.totp({
+      secret: 'totp_secret',
+      encoding: 'base32'
+    });
+    var expectedJwt = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyIjoidGVzdF9vayIsImlhdCI6MCwiZXhwIjozNjAwfQ.ihvaljGjO5h3iSO_h3PkNNSCYeePyB8Hr5lfVZZYyrQ';
+
+    request.post('http://localhost:8080/_auth', { 
+      form: {
+        username: 'test_ok',
+        password: 'password',
+        token: real_token
+      }
+    }, 
+    function (error, response, body) {
+      if (!error && response.statusCode == 200) {
+        assert.equal(body, expectedJwt);
+        clock.restore();
+        done();
+      }
+    });
+  });
+});
diff --git a/app/tests/totp_checker_test.js b/test/totp_checker_test.js
similarity index 94%
rename from app/tests/totp_checker_test.js
rename to test/totp_checker_test.js
index 3a618696..c89b5aaa 100644
--- a/app/tests/totp_checker_test.js
+++ b/test/totp_checker_test.js
@@ -1,5 +1,5 @@
 
-var totp_checker = require('../lib/totp_checker');
+var totp_checker = require('../src/lib/totp_checker');
 var sinon = require('sinon');
 var sinonPromise = require('sinon-promise');
 sinonPromise(sinon);