Module-Rust/client/test/format.test.js

// ── Formatting ────────────────────────────────────────────────────────────
//
// Small functions, and the tests are small too — but three of them guard claims
// that would otherwise be made by a page that looks fine: an unknown duration
// rendered as zero, a timestamp in the wrong unit, and "in 0 seconds".
//
// Locale-dependent output is asserted loosely on purpose. `Intl` formats to the
// RUNNER's locale, and a test pinned to "3 minutes ago" would be a test that
// fails on a machine set to French while the page it describes is correct.

import test from 'node:test'
import assert from 'node:assert/strict'

import { ago, attacker, clock, coins, contrastInk, count, day, duration, nextWipe, prefab, shortId } from '../src/lib/format.js'

const NOW = Date.parse('2026-09-16T12:00:00Z')

test('a relative time picks the unit that fits', () => {
  assert.match(ago(NOW - 3 * 60_000, NOW), /3/)
  assert.match(ago(NOW - 5 * 3600_000, NOW), /5/)
  assert.match(ago(NOW - 3 * 86400_000, NOW), /3/)
})

test('"just now" rather than "in 0 seconds"', () => {
  // What `numeric: 'auto'` produces under a minute is not what anybody means,
  // and a feed row a few seconds old is the commonest row on the page.
  assert.equal(ago(NOW, NOW), 'just now')
  assert.equal(ago(NOW - 10_000, NOW), 'just now')
})

test('both time shapes this module serves are accepted', () => {
  // `updatedAt` is an ISO string the model produced; an event's `t` is the
  // millisecond stamp the plugin put on the frame. A helper that took only one
  // would be a helper every caller has to remember the type for.
  assert.equal(ago('2026-09-16T11:57:00.000Z', NOW), ago(NOW - 3 * 60_000, NOW))
})

test('a missing time is "never", not the epoch', () => {
  assert.equal(ago(null), 'never')
  assert.equal(ago(undefined), 'never')
  assert.equal(ago(''), 'never')
  assert.equal(day(null), 'unknown')
})

test('an unknown duration is a dash, and a short one keeps its seconds', () => {
  // The distinction the plugin makes and this must not lose: `sessionSec` is
  // ABSENT for a player who was already on when it loaded, so zero and unknown
  // arrive at the same function and must not render the same way.
  assert.equal(duration(null), '—')
  assert.equal(duration(0), '—')
  assert.equal(duration(40), '40s')
  assert.equal(duration(90), '2m')
  assert.equal(duration(3720), '1h 2m')
  assert.equal(duration(7200), '2h')
})

test('a prefab reads as words, without a lookup table', () => {
  assert.equal(prefab('rifle.ak'), 'rifle ak')
  assert.equal(prefab('scientistnpc_full_any'), 'scientistnpc full any')
  assert.equal(prefab(null), '')
})

test('a steam id is shortened without pretending to be a name', () => {
  assert.equal(shortId('76561198000000001'), '…000001')
  assert.equal(shortId(''), '')
})

test('a count that is not a number is zero, never NaN on the page', () => {
  assert.equal(count(undefined), '0')
  assert.equal(count(null), '0')
})

test('a balance never reported is a dash, not zero coins (PLAN_REDESIGNS §11.2.2)', () => {
  assert.equal(coins(null), '—')
  assert.equal(coins(undefined), '—')
  assert.equal(coins(0), (0).toLocaleString())
  assert.equal(coins(1500.456), (1500.46).toLocaleString(undefined, { maximumFractionDigits: 2 }))
})

test("a feed row from another day carries its date, not just a time", () => {
  // Found by the page walk: with the feed filtered to the previous wipe, three
  // events from six weeks ago rendered as `02:03 PM` and read as this afternoon.
  // Today's rows stay bare, because a killfeed of today's fights does not want
  // the date on every line.
  // Asserted against `Intl` rather than against a literal: a 12-hour locale puts
  // letters in a bare time ("05:30 AM"), so "has letters in it" is not the test —
  // "is exactly the time, and nothing else" is.
  const time = (at) => new Date(at).toLocaleTimeString(undefined, { hour: '2-digit', minute: '2-digit' })

  const todayAt = NOW - 90 * 60_000
  assert.equal(clock(todayAt, NOW), time(todayAt))

  const olderAt = NOW - 46 * 86400_000
  assert.ok(clock(olderAt, NOW).endsWith(time(olderAt)))
  assert.ok(clock(olderAt, NOW).length > time(olderAt).length, 'an older row carries no date')

  // Yesterday counts as another day even when it is only a few hours back — the
  // boundary is the calendar, not a duration, because that is what a reader
  // means by "what time was that".
  const lateLastNight = Date.parse('2026-09-15T23:50:00')
  const earlyToday = Date.parse('2026-09-16T00:20:00')
  assert.ok(clock(lateLastNight, earlyToday).length > time(lateLastNight).length)
})

test('the next wipe: the reader’s own clock, how far away, and whether it moved', () => {
  const now = Date.parse('2026-09-25T12:00:00Z')
  const forced = nextWipe({ at: '2026-10-01T18:00:00.000Z', source: 'forced' }, now)
  assert.match(forced, /\(in 6 days\)$/)
  assert.ok(!forced.includes('rescheduled'))

  assert.match(nextWipe({ at: '2026-09-27T17:00:00.000Z', source: 'once' }, now), /\(in 2 days\) — rescheduled$/)

  // No schedule is no line, not "unknown": the page leaves the part out.
  assert.equal(nextWipe(null, now), null)
  assert.equal(nextWipe({ at: 'soon', source: 'rule' }, now), null)
})

test('a title chip’s ink is whichever of black and white reads on its colour', () => {
  assert.equal(contrastInk('#ffff00'), '#000000')
  assert.equal(contrastInk('#FFAA55'), '#000000')
  assert.equal(contrastInk('#1a1a8c'), '#ffffff')
  assert.equal(contrastInk('#ff0000'), '#000000')
  assert.equal(contrastInk('red'), '#000000', 'not a hex colour: black, on the caller’s fallback')
})

test('an NPC attacker reads as a name: a family, or the prefab without its variant (F2, D185)', () => {
  // The first walk's "killed by wolf2".
  assert.equal(attacker('wolf2'), 'Wolf')
  assert.equal(attacker('wolf'), 'Wolf')
  assert.equal(attacker('boar'), 'Boar')
  assert.equal(attacker('polarbear'), 'Polar bear')
  assert.equal(attacker('scientistnpc_full_any'), 'Scientist')
  assert.equal(attacker('scientistnpc_roam'), 'Scientist')
  assert.equal(attacker('scientistnpc_heavy'), 'Heavy scientist')
  assert.equal(attacker('npc_bandit_guard'), 'Bandit guard')
  assert.equal(attacker('bradleyapc'), 'Bradley APC')
  assert.equal(attacker('patrolhelicopter'), 'Patrol helicopter')
  assert.equal(attacker('autoturret_deployed'), 'Auto turret')
  assert.equal(attacker('sam_site_turret_deployed'), 'SAM site')
  // Anything unknown still reads as words, capitalised, with no suffix or variant.
  assert.equal(attacker('some_new_beast3'), 'Some new beast')
  assert.equal(attacker('spikes.floor.deployed'), 'Spikes floor')
  assert.equal(attacker(null), '')
  assert.equal(attacker(''), '')
})

test('a weapon keeps the light touch — attacker() is for what did the killing', () => {
  assert.equal(prefab('rifle.ak'), 'rifle ak')
})