emailService.test.js

const { sendEmail, trackEmailAnalytics } = require('./emailService');

// Mock SendGrid's library
jest.mock('@sendgrid/mail', () => ({
    setApiKey: jest.fn(),
    send: jest.fn(() => [{ statusCode: 202 }]),
}));

// Test cases

describe('Email Service Integration', () => {
    it('should send an email successfully', async () => {
        const response = await sendEmail('test@example.com', 'Test Subject', 'Test text', '<p>Test HTML</p>');
        expect(response[0].statusCode).toBe(202);
    });

    it('should track email analytics successfully', () => {
        const consoleSpy = jest.spyOn(console, 'log');
        trackEmailAnalytics({ event: 'delivered' });
        expect(consoleSpy).toHaveBeenCalledWith('Email event:', { event: 'delivered' });
    });
});