eks_relay/tests/spamGate.test.ts

import { test } from 'node:test';
import assert from 'node:assert/strict';
import { evaluateSpam } from '../src/domain/spamGate.js';
import type { SupportMessageEvent } from '../src/domain/messageNormalizer.js';

function evt(overrides: Partial<SupportMessageEvent> = {}): SupportMessageEvent {
  return {
    source: 'chatwoot',
    channel: 'email',
    conversationId: 1311,
    messageId: '1',
    inboxId: 1,
    content: 'Czy ten produkt pasuje do mojego auta?',
    subject: 'Pytanie',
    senderEmail: 'klient@example.com',
    senderName: 'Klient',
    senderId: '1',
    labels: [],
    customAttributes: {},
    additionalAttributes: {},
    attachmentCount: 0,
    needsConversationFetch: false,
    ...overrides,
  };
}

test('a normal customer question passes', () => {
  assert.equal(evaluateSpam(evt()).spam, false);
});

test('mailer-daemon is blocked', () => {
  const v = evaluateSpam(evt({ senderEmail: 'mailer-daemon@example.com' }));
  assert.equal(v.spam, true);
  assert.match(v.reason, /automated_sender/);
});

test('no-reply senders are blocked', () => {
  assert.equal(evaluateSpam(evt({ senderEmail: 'no-reply@shop.example' })).spam, true);
  assert.equal(evaluateSpam(evt({ senderEmail: 'noreply@shop.example' })).spam, true);
});

test('bounce subjects are blocked', () => {
  const v = evaluateSpam(evt({ subject: 'Undelivered Mail Returned to Sender' }));
  assert.equal(v.spam, true);
  assert.equal(v.reason, 'bounce_subject');
});

test('out-of-office autoreplies are blocked', () => {
  assert.equal(evaluateSpam(evt({ subject: 'Automatic reply: your message' })).spam, true);
  assert.equal(evaluateSpam(evt({ subject: 'Automatyczna odpowiedź' })).spam, true);
});

test('DMARC aggregate reports are blocked', () => {
  assert.equal(evaluateSpam(evt({ subject: 'Report domain: easyklima.com' })).spam, true);
});

test('empty bodies and attachment-only mails are blocked', () => {
  assert.equal(evaluateSpam(evt({ content: '' })).reason, 'empty_body');
  assert.equal(evaluateSpam(evt({ content: '', attachmentCount: 2 })).reason, 'attachment_only');
});

test('auto-submitted headers are blocked', () => {
  const v = evaluateSpam(
    evt({ additionalAttributes: { headers: { 'Auto-Submitted': 'auto-replied' } } }),
  );
  assert.equal(v.spam, true);
  assert.equal(v.reason, 'header:auto-submitted');
});

test('auto-submitted: no is NOT treated as automated', () => {
  const v = evaluateSpam(evt({ additionalAttributes: { headers: { 'Auto-Submitted': 'no' } } }));
  assert.equal(v.spam, false);
});

test('list-unsubscribe marks a newsletter', () => {
  const v = evaluateSpam(
    evt({ additionalAttributes: { headers: { 'List-Unsubscribe': '<mailto:x@y.z>' } } }),
  );
  assert.equal(v.spam, true);
});

test('a body with no words is blocked', () => {
  assert.equal(evaluateSpam(evt({ content: '??? !!! ...' })).reason, 'no_textual_content');
});

test('a legitimate mail from an address merely containing "notification" passes', () => {
  // Only exact local-part matches are automated; substrings must not trigger.
  assert.equal(evaluateSpam(evt({ senderEmail: 'notifications.jan@example.com' })).spam, false);
});