bug(users): Fix email duplication

- normalizes email upon signup

[Delivers #167975800]

Author: leonardnjura

src/server/middlewares/validateBody.js

@@ -1,6 +1,10 @@
 const Joi = require('joi');
 
 module.exports = (req, res, next, schema) => {
+  if (req.body.email) {
+    const email = req.body.email;
+    req.body.email = email.toLowerCase();
+  }
   Joi.validate(req.body, schema, error => {
     if (error) {
       return res.status(400).send({ message: error.details[0].message });

src/tests/users.spec.js

@@ -19,6 +19,13 @@ const newUser = {
   username: 'Oliver Brice',
 };
 
+const newUserCaps = {
+  ...testUser,
+  email: 'oliver.BRICE@andela.com',
+  username: 'Oliver Brice',
+};
+
+
 jest.mock('nodemailer', () => ({
   createTransport: () => ({
     sendMail: (options, call) => {
@@ -56,6 +63,15 @@ describe('User tests', () => {
     });
   });
 
+  it('should normalize email', done => {
+    sendRequest('post', '/api/users', newUser, () => {
+      sendRequest('post', '/api/users', newUserCaps, (err, res) => {
+        expect(res.text).toMatch('email must be unique');
+        done();
+      });
+    });
+  });
+
   it('should login an authorised user', done => {
     sendRequest(
       'post',
@@ -78,7 +94,7 @@ describe('User tests', () => {
         done();
       }
     );
-  });
+  });    
 
   it('should not login an user with missing email', done => {
     sendRequest('post', '/api/users/login', {}, (err, res) => {