Test Mocki

test-mocks

const should = require('should');
const mockery = require('mockery');
const nodemailerMock = require('nodemailer-mock');

describe('Tests that send email',  async () {
  before(async () {
    mockery.enable({warnOnUnregistered: false}); // Enable mockery to mock objects
    mockery.registerMock('nodemailer', nodemailerMock)
  });

  afterEach(async () {
    nodemailerMock.mock.reset();     // Reset the mock back to the defaults after each test
  });

  after(async () {
    // Remove our mocked nodemailer and disable mockery
    mockery.deregisterAll();
    mockery.disable();
  });

  it('should send an email using nodemailer-mock', async () {
    app.sendEmail(); // call a service that uses nodemailer
    const sentMail = nodemailerMock.mock.getSentMail(); // get the array of emails we sent
    sentMail.length.should.be.exactly(1);// we should have sent one email
  });

});