negyedik gyakorlat + megoldasok
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magdo
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const EmailService = require('../../../src/application/services/EmailService');
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const nodemailer = require('nodemailer');
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// Mock nodemailer
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jest.mock('nodemailer');
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describe('EmailService', () => {
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let emailService;
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let mockTransporter;
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beforeEach(() => {
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// Reset mocks
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jest.clearAllMocks();
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// Mock transporter
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mockTransporter = {
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sendMail: jest.fn().mockResolvedValue({
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messageId: 'test-message-id',
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response: '250 OK',
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}),
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};
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// Mock nodemailer.createTransport
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nodemailer.createTransport.mockReturnValue(mockTransporter);
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// Create EmailService instance
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emailService = new EmailService();
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});
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describe('constructor', () => {
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test('should create transporter with correct configuration', () => {
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expect(nodemailer.createTransport).toHaveBeenCalled();
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const config = nodemailer.createTransport.mock.calls[0][0];
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expect(config).toHaveProperty('host');
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expect(config).toHaveProperty('port');
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expect(config).toHaveProperty('auth');
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expect(config.auth).toHaveProperty('user');
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expect(config.auth).toHaveProperty('pass');
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});
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test('should initialize transporter instance', () => {
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expect(emailService.transporter).toBeDefined();
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expect(emailService.transporter).toBe(mockTransporter);
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});
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});
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describe('sendWelcomeEmail', () => {
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test('should send welcome email with correct parameters', async () => {
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const userEmail = 'test@example.com';
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const userName = 'John Doe';
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await emailService.sendWelcomeEmail(userEmail, userName);
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expect(mockTransporter.sendMail).toHaveBeenCalledTimes(1);
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const emailOptions = mockTransporter.sendMail.mock.calls[0][0];
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expect(emailOptions.to).toBe(userEmail);
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expect(emailOptions.subject).toContain('Üdvözlünk');
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expect(emailOptions).toHaveProperty('html');
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});
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test('should include user name in email content', async () => {
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const userEmail = 'jane@example.com';
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const userName = 'Jane Smith';
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await emailService.sendWelcomeEmail(userEmail, userName);
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const emailOptions = mockTransporter.sendMail.mock.calls[0][0];
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expect(emailOptions.html).toContain(userName);
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});
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test('should include user email in email content', async () => {
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const userEmail = 'contact@test.com';
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const userName = 'Test User';
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await emailService.sendWelcomeEmail(userEmail, userName);
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const emailOptions = mockTransporter.sendMail.mock.calls[0][0];
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expect(emailOptions.html).toContain(userEmail);
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});
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test('should return messageId on successful send', async () => {
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const result = await emailService.sendWelcomeEmail('user@test.com', 'User');
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expect(result).toBeDefined();
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expect(result.messageId).toBe('test-message-id');
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});
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test('should use correct from address', async () => {
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await emailService.sendWelcomeEmail('recipient@test.com', 'Recipient');
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const emailOptions = mockTransporter.sendMail.mock.calls[0][0];
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expect(emailOptions).toHaveProperty('from');
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expect(emailOptions.from).toBeTruthy();
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});
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test('should handle multiple recipients', async () => {
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await emailService.sendWelcomeEmail('user1@test.com', 'User 1');
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await emailService.sendWelcomeEmail('user2@test.com', 'User 2');
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await emailService.sendWelcomeEmail('user3@test.com', 'User 3');
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expect(mockTransporter.sendMail).toHaveBeenCalledTimes(3);
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});
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});
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describe('error handling', () => {
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test('should throw error when email sending fails', async () => {
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mockTransporter.sendMail.mockRejectedValue(new Error('SMTP connection failed'));
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await expect(
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emailService.sendWelcomeEmail('user@test.com', 'User')
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).rejects.toThrow('SMTP connection failed');
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});
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test('should throw error for invalid email address', async () => {
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mockTransporter.sendMail.mockRejectedValue(new Error('Invalid recipient'));
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await expect(
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emailService.sendWelcomeEmail('invalid-email', 'User')
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).rejects.toThrow();
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});
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test('should throw error when transporter is not configured', async () => {
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mockTransporter.sendMail.mockRejectedValue(new Error('Transporter not configured'));
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await expect(
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emailService.sendWelcomeEmail('user@test.com', 'User')
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).rejects.toThrow('Transporter not configured');
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});
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});
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describe('template rendering', () => {
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test('should render HTML template with Handlebars', async () => {
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await emailService.sendWelcomeEmail('template@test.com', 'Template User');
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const emailOptions = mockTransporter.sendMail.mock.calls[0][0];
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// Check that HTML is rendered (not raw Handlebars template)
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expect(emailOptions.html).not.toContain('{{userName}}');
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expect(emailOptions.html).not.toContain('{{userEmail}}');
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expect(emailOptions.html).toContain('Template User');
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expect(emailOptions.html).toContain('template@test.com');
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});
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test('should handle special characters in user name', async () => {
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const specialName = "O'Reilly & Sons <script>alert('xss')</script>";
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await emailService.sendWelcomeEmail('user@test.com', specialName);
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const emailOptions = mockTransporter.sendMail.mock.calls[0][0];
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// Handlebars should escape HTML by default
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expect(emailOptions.html).toBeDefined();
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});
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test('should use correct template file path', async () => {
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await emailService.sendWelcomeEmail('user@test.com', 'User');
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// Verify that email was sent (which means template was loaded successfully)
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expect(mockTransporter.sendMail).toHaveBeenCalled();
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});
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});
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describe('real-world scenarios', () => {
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test('should send welcome email after user registration', async () => {
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const newUser = {
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email: 'newuser@example.com',
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name: 'New User',
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};
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const result = await emailService.sendWelcomeEmail(newUser.email, newUser.name);
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expect(result).toBeDefined();
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expect(mockTransporter.sendMail).toHaveBeenCalledWith(
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expect.objectContaining({
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to: newUser.email,
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html: expect.stringContaining(newUser.name),
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})
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);
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});
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test('should handle concurrent email sends', async () => {
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const users = [
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{ email: 'user1@test.com', name: 'User 1' },
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{ email: 'user2@test.com', name: 'User 2' },
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{ email: 'user3@test.com', name: 'User 3' },
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];
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await Promise.all(
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users.map(user => emailService.sendWelcomeEmail(user.email, user.name))
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);
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expect(mockTransporter.sendMail).toHaveBeenCalledTimes(3);
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});
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test('should work with Ethereal Email test account', async () => {
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// Simulate Ethereal Email configuration
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const etherealTransporter = {
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sendMail: jest.fn().mockResolvedValue({
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messageId: '<ethereal-id@ethereal.email>',
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response: '250 Accepted',
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}),
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};
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nodemailer.createTransport.mockReturnValue(etherealTransporter);
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const etherealEmailService = new EmailService();
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const result = await etherealEmailService.sendWelcomeEmail('test@ethereal.email', 'Test User');
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expect(result.messageId).toContain('ethereal');
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expect(etherealTransporter.sendMail).toHaveBeenCalled();
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});
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});
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describe('email content validation', () => {
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test('should include welcome message', async () => {
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await emailService.sendWelcomeEmail('user@test.com', 'User');
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const emailOptions = mockTransporter.sendMail.mock.calls[0][0];
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expect(emailOptions.html.toLowerCase()).toMatch(/üdvözl|welcome/i);
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});
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test('should be HTML formatted', async () => {
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await emailService.sendWelcomeEmail('user@test.com', 'User');
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const emailOptions = mockTransporter.sendMail.mock.calls[0][0];
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expect(emailOptions.html).toContain('<html');
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expect(emailOptions.html).toContain('</html>');
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});
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test('should have valid subject line', async () => {
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await emailService.sendWelcomeEmail('user@test.com', 'User');
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const emailOptions = mockTransporter.sendMail.mock.calls[0][0];
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expect(emailOptions.subject).toBeTruthy();
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expect(emailOptions.subject.length).toBeGreaterThan(0);
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});
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});
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});
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