diff --git a/client/core/src/directives/specs/validation.spec.js b/client/core/src/directives/specs/validation.spec.js
index e69de29bb..3ff608a68 100644
--- a/client/core/src/directives/specs/validation.spec.js
+++ b/client/core/src/directives/specs/validation.spec.js
@@ -0,0 +1,81 @@
+describe('Directive validation', () => {
+    let scope;
+    let element;
+    let compile;
+
+    beforeEach(() => {
+        angular.mock.module('client');
+    });
+
+    compile = (_element, validations, value) => {
+        inject(($compile, $rootScope, aclService, _$timeout_, $window) => {
+            $window.validations = validations;
+            scope = $rootScope.$new();
+            scope.user = {name: value};
+            element = angular.element(_element);
+            $compile(element)(scope);
+            scope.$digest();
+        });
+    };
+
+    it(`should throw an error if the vnValidation doesn't have the right syntax`, () => {
+        let html = `<input type="name" ng-model="user.name" vn-validation="user"/>`;
+
+        expect(() => {
+            compile(html, {});
+        }).toThrow(new Error(`vnValidation: Attribute must have this syntax: [entity].[field]`));
+    });
+
+    it('should throw an error if the window.validations are not defined', () => {
+        let html = `<input type="name" ng-model="user.name" vn-validation="user.name"/>`;
+
+        expect(() => {
+            compile(html, {});
+        }).toThrow(new Error(`vnValidation: Entity 'User' doesn't exist`));
+    });
+
+    // should adapt the test to whathver needs to test the user name instead of mail validation as it should be in mail-validation.js
+    describe('Validator Presence()', () => {
+        it('should not validate the user name as it is an empty string', () => {
+            let html = `<form><input type="name" ng-model="user.name" vn-validation="user.name"/></form>`;
+            let validations = {User: {validations: {name: [{validation: 'presence'}]}}};
+            compile(html, validations, 'Spiderman');
+            scope.user.name = '';
+
+            expect(element[0].classList).toContain('ng-valid');
+            expect(element[0].classList).not.toContain('ng-invalid');
+            scope.$digest();
+
+            expect(element[0].classList).toContain('ng-invalid');
+            expect(element[0].classList).not.toContain('ng-valid');
+        });
+    });
+
+    it(`should not validate the name as it's format is incorrect`, () => {
+        let html = `<form><input type="name" ng-model="user.name" vn-validation="user.name"/></form>`;
+        let validations = {User: {validations: {name: [{validation: 'presence'}]}}};
+        compile(html, validations, 'spiderman');
+        scope.user.email = '1234?';
+
+        expect(element[0].classList).toContain('ng-valid');
+        expect(element[0].classList).not.toContain('ng-invalid');
+        scope.$digest();
+
+        expect(element[0].classList).toContain('ng-invalid');
+        expect(element[0].classList).not.toContain('ng-valid');
+    });
+
+    it(`should validate the email as it's format is correct`, () => {
+        let html = `<form><input type="email" ng-model="user.email" vn-validation="user.email"/></form>`;
+        let validations = {User: {validations: {email: [{validation: 'presence'}]}}};
+        compile(html, validations, 'user@verdnatura.es');
+        scope.user.email = 'user@verdnatura.es';
+
+        expect(element[0].classList).toContain('ng-valid');
+        expect(element[0].classList).not.toContain('ng-invalid');
+        scope.$digest();
+
+        expect(element[0].classList).toContain('ng-valid');
+        expect(element[0].classList).not.toContain('ng-invalid');
+    });
+});
diff --git a/client/core/src/directives/validation.js b/client/core/src/directives/validation.js
index cd3878d9e..db34fe12b 100644
--- a/client/core/src/directives/validation.js
+++ b/client/core/src/directives/validation.js
@@ -51,9 +51,9 @@ export function directive(interpolate, compile, $window) {
             }
         };
 
-        scope.$watch(function() {
+        scope.$watch(() => {
             return (form.$submitted || input.$dirty) && input.$invalid;
-        }, function(value) {
+        }, value => {
             let parent = element.parent();
 
             if (value) {
diff --git a/client/core/src/lib/validator.js b/client/core/src/lib/validator.js
index d31fa9e36..ce6dc989b 100644
--- a/client/core/src/lib/validator.js
+++ b/client/core/src/lib/validator.js
@@ -1,7 +1,7 @@
 import {validator} from 'vendor';
 
 export const validators = {
-    presence: function(value, conf) {
+    presence: value => {
         if (validator.isEmpty(value))
             throw new Error(`Value can't be empty`);
     },
diff --git a/services/mailer/application/auth.js b/services/mailer/application/auth.js
index 7e9457537..dc84cd911 100644
--- a/services/mailer/application/auth.js
+++ b/services/mailer/application/auth.js
@@ -47,8 +47,7 @@ module.exports = {
             this.request.user = {
                 id: token.userId,
                 token: this.getToken()
-            }
-
+            };
             this.next();
         });
     },
diff --git a/services/mailer/application/config.js b/services/mailer/application/config.js
index 1442e85ed..ab30f576b 100644
--- a/services/mailer/application/config.js
+++ b/services/mailer/application/config.js
@@ -15,4 +15,4 @@ try {
 config.proxy = require('../../nginx/config.json');
 config.package = require('../package.json');
 
-module.exports = config;
\ No newline at end of file
+module.exports = config;