Rechtliches: Fristen- und Versionslogik mit Tests

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/legal.test.mjs

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+import { test } from 'node:test'
+import assert from 'node:assert/strict'
+import {
+  addMonthsClamped,
+  nextCancellationDate,
+  deadlineTone,
+  currentVersion,
+  planNewVersion,
+  formatDate,
+} from '../src/lib/legal.js'
+
+const yearly = {
+  startDate: '2025-03-12',
+  termMonths: 12,
+  renewalMonths: 12,
+  noticeValue: 1,
+  noticeUnit: 'months',
+}
+
+test('addMonthsClamped klemmt auf Monatsende', () => {
+  assert.equal(addMonthsClamped('2026-01-31', 1), '2026-02-28')
+  assert.equal(addMonthsClamped('2028-01-31', 1), '2028-02-29')
+  assert.equal(addMonthsClamped('2026-03-15', 12), '2027-03-15')
+  assert.equal(addMonthsClamped('2026-03-31', -1), '2026-02-28')
+})
+
+test('laufender Jahresvertrag', () => {
+  assert.deepEqual(nextCancellationDate(yearly, '2026-09-30'), {
+    state: 'active',
+    periodEnd: '2027-03-12',
+    noticeBy: '2027-02-12',
+  })
+})
+
+test('Kündigungstermin heute zählt noch, danach nächste Periode', () => {
+  assert.equal(nextCancellationDate(yearly, '2027-02-12').noticeBy, '2027-02-12')
+  const next = nextCancellationDate(yearly, '2027-02-13')
+  assert.equal(next.periodEnd, '2028-03-12')
+  assert.equal(next.noticeBy, '2028-02-12')
+})
+
+test('Kündigungsfrist in Tagen', () => {
+  const r = nextCancellationDate({ ...yearly, noticeValue: 30, noticeUnit: 'days' }, '2026-09-30')
+  assert.equal(r.periodEnd, '2027-03-12')
+  assert.equal(r.noticeBy, '2027-02-10')
+})
+
+test('Start am 31. läuft nicht in den Folgemonat über', () => {
+  const r = nextCancellationDate(
+    { startDate: '2026-01-31', termMonths: 1, renewalMonths: 1, noticeValue: 0, noticeUnit: 'days' },
+    '2026-02-01'
+  )
+  assert.equal(r.periodEnd, '2026-02-28')
+})
+
+test('jederzeit kündbar', () => {
+  const r = nextCancellationDate({ startDate: '2025-01-01', termMonths: 0 }, '2026-09-30')
+  assert.equal(r.state, 'anytime')
+  assert.equal(r.noticeBy, null)
+})
+
+test('ohne Verlängerung: endet, danach beendet', () => {
+  const c = { startDate: '2026-01-01', termMonths: 12, renewalMonths: 0 }
+  assert.deepEqual(nextCancellationDate(c, '2026-09-30'), { state: 'ends', periodEnd: '2027-01-01', noticeBy: null })
+  assert.equal(nextCancellationDate(c, '2027-01-02').state, 'ended')
+})
+
+test('gekündigt', () => {
+  const r = nextCancellationDate({ ...yearly, cancelledAt: '2026-09-01', endsAt: '2027-03-12' }, '2026-09-30')
+  assert.deepEqual(r, { state: 'cancelled', periodEnd: '2027-03-12', noticeBy: null })
+})
+
+test('unvollständige Angaben', () => {
+  assert.equal(nextCancellationDate({ ...yearly, startDate: '' }, '2026-09-30').state, 'incomplete')
+  assert.equal(nextCancellationDate({ ...yearly, noticeValue: null }, '2026-09-30').state, 'incomplete')
+  assert.equal(nextCancellationDate({ startDate: '2026-01-01' }, '2026-09-30').state, 'incomplete')
+})
+
+test('deadlineTone', () => {
+  const today = '2026-09-30'
+  const at = (noticeBy) => deadlineTone({ state: 'active', noticeBy, periodEnd: null }, today)
+  assert.equal(at('2026-10-30'), 'red')
+  assert.equal(at('2026-10-31'), 'orange')
+  assert.equal(at('2026-12-29'), 'orange')
+  assert.equal(at('2026-12-30'), 'normal')
+  assert.equal(deadlineTone({ state: 'cancelled' }, today), 'grey')
+  assert.equal(deadlineTone({ state: 'ended' }, today), 'grey')
+  assert.equal(deadlineTone({ state: 'incomplete' }, today), 'missing')
+  assert.equal(deadlineTone({ state: 'anytime' }, today), 'normal')
+  assert.equal(deadlineTone({ state: 'ends' }, today), 'normal')
+})
+
+const v5 = { $id: 'v5', documentKey: 'agb', version: 'v5', status: 'current', validFrom: '2026-05-01', validTo: null }
+const v4 = { $id: 'v4', documentKey: 'agb', version: 'v4', status: 'superseded', validFrom: '2026-01-10', validTo: '2026-04-30' }
+
+test('neue gültige Version löst die aktuelle ab', () => {
+  const r = planNewVersion([v4, v5], { documentKey: 'agb', version: 'v6', status: 'current', validFrom: '2026-09-01' })
+  assert.deepEqual(r.updates, [{ id: 'v5', patch: { status: 'superseded', validTo: '2026-08-31' } }])
+  assert.equal(r.create.validTo, null)
+  assert.equal(r.create.status, 'current')
+})
+
+test('Entwurf löst nichts ab', () => {
+  const r = planNewVersion([v4, v5], { documentKey: 'agb', version: 'v6', status: 'draft', validFrom: '2026-12-01' })
+  assert.deepEqual(r.updates, [])
+  assert.equal(r.create.status, 'draft')
+})
+
+test('Nachtrag einer alten Fassung löst die aktuelle nicht ab', () => {
+  const r = planNewVersion([v4, v5], { documentKey: 'agb', version: 'v4b', status: 'current', validFrom: '2026-02-01' })
+  assert.deepEqual(r.updates, [])
+  assert.equal(r.create.status, 'superseded')
+  assert.equal(r.create.validTo, '2026-04-30')
+})
+
+test('currentVersion nimmt bei zwei gültigen die jüngere', () => {
+  const twin = { ...v5, $id: 'v6', version: 'v6', validFrom: '2026-09-01' }
+  assert.equal(currentVersion([v4, v5, twin]).$id, 'v6')
+  assert.equal(currentVersion([v4]), null)
+})
+
+test('formatDate', () => {
+  assert.equal(formatDate('2026-09-30'), '30.09.2026')
+  assert.equal(formatDate(''), '–')
+  assert.equal(formatDate(null), '–')
+})