rentall-app/backend/tests/unit/services/email/emailUtils.test.js

const {
  htmlToPlainText,
  formatEmailDate,
  formatShortDate,
  formatCurrency,
} = require('../../../../services/email/core/emailUtils');

describe('Email Utils', () => {
  describe('htmlToPlainText', () => {
    it('should remove HTML tags', () => {
      const html = '<p>Hello <strong>World</strong></p>';
      const result = htmlToPlainText(html);
      expect(result).toBe('Hello World');
    });

    it('should convert br tags to newlines', () => {
      const html = 'Line 1<br>Line 2<br/>Line 3';
      const result = htmlToPlainText(html);
      expect(result).toBe('Line 1\nLine 2\nLine 3');
    });

    it('should convert p tags to double newlines', () => {
      const html = '<p>Paragraph 1</p><p>Paragraph 2</p>';
      const result = htmlToPlainText(html);
      expect(result).toContain('Paragraph 1');
      expect(result).toContain('Paragraph 2');
    });

    it('should convert li tags to bullet points', () => {
      const html = '<ul><li>Item 1</li><li>Item 2</li></ul>';
      const result = htmlToPlainText(html);
      expect(result).toContain('• Item 1');
      expect(result).toContain('• Item 2');
    });

    it('should remove style tags and their content', () => {
      const html = '<style>.class { color: red; }</style><p>Content</p>';
      const result = htmlToPlainText(html);
      expect(result).toBe('Content');
      expect(result).not.toContain('color');
    });

    it('should remove script tags and their content', () => {
      const html = '<script>alert("test")</script><p>Content</p>';
      const result = htmlToPlainText(html);
      expect(result).toBe('Content');
      expect(result).not.toContain('alert');
    });

    it('should decode HTML entities', () => {
      const html = '&amp; &lt; &gt; &quot; &#39; &nbsp;';
      const result = htmlToPlainText(html);
      expect(result).toContain('&');
      expect(result).toContain('<');
      expect(result).toContain('>');
      expect(result).toContain('"');
      expect(result).toContain("'");
    });

    it('should handle empty string', () => {
      expect(htmlToPlainText('')).toBe('');
    });

    it('should trim whitespace', () => {
      const html = '   <p>Content</p>   ';
      const result = htmlToPlainText(html);
      expect(result).toBe('Content');
    });

    it('should collapse multiple newlines', () => {
      const html = '<p>Line 1</p>\n\n\n\n<p>Line 2</p>';
      const result = htmlToPlainText(html);
      expect(result).not.toMatch(/\n{4,}/);
    });
  });

  describe('formatEmailDate', () => {
    it('should format a Date object', () => {
      const date = new Date('2024-03-15T14:30:00');
      const result = formatEmailDate(date);
      expect(result).toContain('March');
      expect(result).toContain('15');
      expect(result).toContain('2024');
    });

    it('should format a date string', () => {
      const dateStr = '2024-06-20T10:00:00';
      const result = formatEmailDate(dateStr);
      expect(result).toContain('June');
      expect(result).toContain('20');
      expect(result).toContain('2024');
    });

    it('should include day of week', () => {
      const date = new Date('2024-03-15T14:30:00'); // Friday
      const result = formatEmailDate(date);
      expect(result).toContain('Friday');
    });

    it('should include time', () => {
      const date = new Date('2024-03-15T14:30:00');
      const result = formatEmailDate(date);
      expect(result).toMatch(/\d{1,2}:\d{2}/);
    });
  });

  describe('formatShortDate', () => {
    it('should format a Date object without time', () => {
      const date = new Date('2024-03-15T14:30:00');
      const result = formatShortDate(date);
      expect(result).toContain('March');
      expect(result).toContain('15');
      expect(result).toContain('2024');
      expect(result).not.toMatch(/\d{1,2}:\d{2}/); // No time
    });

    it('should format a date string', () => {
      const dateStr = '2024-12-25T00:00:00';
      const result = formatShortDate(dateStr);
      expect(result).toContain('December');
      expect(result).toContain('25');
      expect(result).toContain('2024');
    });
  });

  describe('formatCurrency', () => {
    it('should format amount in cents to USD', () => {
      const result = formatCurrency(1000);
      expect(result).toBe('$10.00');
    });

    it('should handle decimal amounts', () => {
      const result = formatCurrency(1050);
      expect(result).toBe('$10.50');
    });

    it('should handle large amounts', () => {
      const result = formatCurrency(100000);
      expect(result).toBe('$1,000.00');
    });

    it('should handle zero', () => {
      const result = formatCurrency(0);
      expect(result).toBe('$0.00');
    });

    it('should accept currency parameter', () => {
      const result = formatCurrency(1000, 'EUR');
      expect(result).toContain('€');
    });
  });
});