hyper-social / bridge-email / test / parser.test.js

import test from 'brittle'
import { parseEmail } from '../lib/imap-client.js'

test('parseEmail - simple email', (t) => {
  const raw = [
    'From: Alice <alice@example.com>',
    'To: bob@example.com',
    'Subject: Test',
    'Date: Fri, 14 Feb 2026 10:00:00 +0000',
    'Message-ID: <abc123@example.com>',
    'Content-Type: text/plain; charset=utf-8',
    '',
    'Hello, this is a test email.'
  ].join('\r\n')

  const email = parseEmail(raw)
  t.is(email.from, 'Alice <alice@example.com>')
  t.is(email.to, 'bob@example.com')
  t.is(email.subject, 'Test')
  t.is(email.body, 'Hello, this is a test email.')
  t.is(email.messageId, '<abc123@example.com>')
})

test('parseEmail - multiline body', (t) => {
  const raw = [
    'From: sender@test.com',
    'Subject: Multi',
    '',
    'Line 1',
    'Line 2',
    'Line 3'
  ].join('\r\n')

  const email = parseEmail(raw)
  t.ok(email.body.includes('Line 1'))
  t.ok(email.body.includes('Line 2'))
  t.ok(email.body.includes('Line 3'))
})

test('parseEmail - multipart text/plain extraction', (t) => {
  const raw = [
    'From: sender@test.com',
    'Subject: Multipart',
    'Content-Type: multipart/alternative; boundary="boundary123"',
    '',
    '--boundary123',
    'Content-Type: text/plain; charset=utf-8',
    '',
    'Plain text body here',
    '--boundary123',
    'Content-Type: text/html; charset=utf-8',
    '',
    '<html><body>HTML body</body></html>',
    '--boundary123--'
  ].join('\r\n')

  const email = parseEmail(raw)
  t.ok(email.body.includes('Plain text body'))
  t.absent(email.body.includes('HTML body'))
})

test('parseEmail - quoted-printable decoding', (t) => {
  const raw = [
    'From: sender@test.com',
    'Subject: QP',
    'Content-Transfer-Encoding: quoted-printable',
    '',
    'Hello =C3=A9l=C3=A8ve'
  ].join('\r\n')

  const email = parseEmail(raw)
  t.ok(email.body.includes('Hello'))
  // UTF-8 decoded é and è
  t.ok(email.body.includes('élève'))
})

test('parseEmail - no headers', (t) => {
  const raw = 'Just a body with no headers at all'
  const email = parseEmail(raw)
  t.is(email.from, '')
  t.is(email.subject, '')
  t.ok(email.body.includes('Just a body'))
})

test('parseEmail - base64 encoding', (t) => {
  const raw = [
    'From: sender@test.com',
    'Subject: B64',
    'Content-Transfer-Encoding: base64',
    '',
    Buffer.from('Decoded base64 content').toString('base64')
  ].join('\r\n')

  const email = parseEmail(raw)
  t.is(email.body, 'Decoded base64 content')
})