#16: fixes mailer and test

services/mailer.js

@@ -0,0 +1,32 @@
+const mailgun = require('mailgun-js');
+const logger = require('../lib/log')(__filename)
+require('dotenv').config()
+
+const mg = mailgun({apiKey: process.env.MAILGUN_API_KEY, domain: process.env.MAILGUN_DOMAIN});
+
+const mgModule = {}
+
+mgModule.sendConfirmationEmail = (receiver, token) => {    
+    const link = `https://learndatabases.dev/emailConfirmation/${token}`
+    const data = {
+        from: 'admin@learndatabases.dev',
+        to: receiver,
+        subject: 'Congratulations!',
+        text: 'Welcome to C0D3',
+        html: `
+        <h1> Confirm your Email </h1>
+        <p>
+        <a href="${link}">Click Here</a>
+        </p>
+        <p> Or visit this link: <a href="${link}">${link}</a></p>
+        `
+    };
+    return mg.messages().send(data).then((returnedData) => {
+        logger.info('Confirmation Email successfully sent', returnedData)
+    }).catch((err) => {
+        logger.error('Confirmation Email Error:',err)
+        return err
+    })      
+}
+
+module.exports = mgModule

services/mailer.test.js

@@ -0,0 +1,43 @@
+jest.mock('../lib/log')
+const logGen = require('../lib/log')
+const logger = {
+    info: jest.fn(),
+    error: jest.fn()
+}
+logGen.mockReturnValue(logger)
+
+jest.mock('mailgun-js')
+const mailgun = require('mailgun-js');
+const messages = {}
+mailgun.mockImplementation(() => {
+    return {
+        messages: () => {
+            return messages
+        }
+    }
+})
+
+const email = require('./mailer');
+
+describe('Test mailgun', ()=>{
+    beforeEach(() => {
+        jest.clearAllMocks()
+    })
+
+    it('should test if mocksend and mailgun is called', async () => {
+        messages.send = jest.fn().mockReturnValue(Promise.resolve('hello'))
+        await email.sendConfirmationEmail('paul@github.com', 'token123')
+        expect(messages.send).toHaveBeenCalledTimes(1)
+        expect(messages.send.mock.calls[0][0]).toMatchSnapshot()
+        expect(logger.info).toHaveBeenCalledTimes(1)
+        expect(logger.info.mock.calls[0][0]).toEqual('Confirmation Email successfully sent')
+    })
+
+    it('should call logger.error when function is called with invalid argument', async () => {
+        messages.send = jest.fn().mockReturnValue(Promise.reject('rejected'))
+        await email.sendConfirmationEmail(null, null)
+        expect(logger.error).toHaveBeenCalledTimes(1)
+        expect(logger.error.mock.calls[0][0]).toEqual('Confirmation Email Error:')
+    })
+
+})