wulf-pulse/lib/services/campaign-grouping-service.test.ts

import { describe, it, expect, vi } from 'vitest';

// Mock postgresClient BEFORE importing the module under test.
const queryMock = vi.fn();
const transactionMock = vi.fn();
vi.mock('./postgres-client', () => ({
  postgresClient: {
    query: (...args: unknown[]) => queryMock(...args),
    transaction: (...args: unknown[]) => transactionMock(...args),
  },
}));

// eslint-disable-next-line import/first -- imported after vi.mock hoisting
import { normalizeSubject, extractUrlDomain } from './campaign-grouping-service';

describe('normalizeSubject', () => {
  it('strips a single Re: prefix, lowercases, trims', () => {
    expect(normalizeSubject('Re: Your Invoice ')).toBe('your invoice');
  });

  it('strips repeated Re:/Fwd:/Fw: prefixes case-insensitively', () => {
    expect(normalizeSubject('FW: Re: fwd: Urgent Payment')).toBe('urgent payment');
  });

  it('handles null', () => {
    expect(normalizeSubject(null)).toBe('');
  });

  it('handles empty string', () => {
    expect(normalizeSubject('')).toBe('');
  });

  it('lowercases and trims a subject with no prefix', () => {
    expect(normalizeSubject('  Urgent Payment  ')).toBe('urgent payment');
  });
});

describe('extractUrlDomain', () => {
  it('extracts hostname from a full URL', () => {
    expect(extractUrlDomain('https://evil.example.com/path?x=1')).toBe('evil.example.com');
  });

  it('returns null for a malformed URL instead of throwing', () => {
    expect(extractUrlDomain('not-a-url')).toBeNull();
  });

  it('extracts hostname regardless of scheme', () => {
    expect(extractUrlDomain('http://another.example.net')).toBe('another.example.net');
  });
});