Module-uo/server/test/entry.test.js

// The entry point's contract with core (MODULE_API.md §2.2).
//
// Slice 0 registers nothing, so there is very little behaviour to assert — and
// the rules that DO apply are the ones that would otherwise be discovered on an
// operator's install: registering synchronously, never awaiting, never touching
// a database, never mutating what it was handed. Those hold for every slice
// after this one too, which is why they are tested against the entry point
// rather than against whatever it happens to register today.

const test = require('node:test')
const assert = require('node:assert')

const register = require('../index')
const { fakeCtx, fakeApi } = require('./_fakes')

test('exports a single register function', () => {
  assert.strictEqual(typeof register, 'function')
})

test('registers synchronously and returns nothing to await', () => {
  const result = register(fakeCtx(), fakeApi())
  // Not `assert.strictEqual(result, undefined)` alone: a module that returned a
  // promise would be a module whose registration core silently never waits for.
  assert.ok(!result || typeof result.then !== 'function', 'register() must not return a thenable')
})

test('touches no database at registration time', () => {
  const ctx = fakeCtx()
  register(ctx, fakeApi())
  assert.deepStrictEqual(ctx.db.query.calls, [], 'register() queried the database')
})

test('registers exactly what module.json declares', () => {
  // The loader compares these two in BOTH directions and rejects a mismatch
  // either way, so a prefix registered without being declared and a prefix
  // declared without being registered are both module-breaking. Asserting
  // against the manifest rather than a literal list means the test cannot drift
  // from the file core actually reads.
  const api = fakeApi()
  register(fakeCtx(), api)

  const manifest = require('../../module.json')
  for (const tier of ['public', 'admin', 'player']) {
    assert.deepStrictEqual(
      Object.keys(api.record.routes[tier]).sort(),
      [...manifest.mounts[tier]].sort(),
      `${tier} mounts disagree with module.json`,
    )
    for (const router of Object.values(api.record.routes[tier])) {
      assert.strictEqual(typeof router, 'function', `${tier} router is not a router`)
    }
  }

  assert.deepStrictEqual(api.record.extensions.map((e) => e.slot), manifest.extensions)
  assert.deepStrictEqual(api.record.legs.map((l) => l.leg), ['towncrier'])
  assert.ok(api.record.streams.length > 0)
  assert.strictEqual(typeof api.record.hooks.onBoot, 'function')
  assert.strictEqual(typeof api.record.hooks.onShutdown, 'function')
})

test('every registered stream is namespaced or grandfathered', () => {
  // Core rejects a stream id that carries neither this module's prefix nor a
  // §6.5 grandfathered name. The seven legacy ids are stored in
  // `notification_subs` and read by a shipped Android client, so they are
  // allowlisted rather than renamed — but a NEW id must be namespaced, and this
  // is where that is caught before an install refuses to load the module.
  // Copied from core's loader (LEGACY_STREAM_IDS), deliberately rather than
  // imported — this repo has no dependency on core's source, and a copy that
  // drifts is caught by the module failing to load, which is the failure this
  // test exists to move earlier.
  const GRANDFATHERED = new Set([
    'server.status', 'idoc.warning', 'champ.start', 'governor.election',
    'vendor.sale', 'house.idoc', 'account.login',
  ])
  const api = fakeApi()
  register(fakeCtx(), api)
  for (const s of api.record.streams) {
    assert.ok(
      s.id.startsWith('uo.') || GRANDFATHERED.has(s.id),
      `stream "${s.id}" is neither namespaced "uo." nor grandfathered`,
    )
    assert.ok(s.label && s.description, `stream "${s.id}" is missing its wire shape`)
    assert.strictEqual(typeof s.personal, 'boolean')
    assert.strictEqual(typeof s.requiresLinkedAccount, 'boolean')
  }
})

test('takes a frozen ctx and does not try to write to it', () => {
  const ctx = fakeCtx()
  assert.ok(Object.isFrozen(ctx))
  // Core freezes one level deep; a module that assigned to ctx would throw here
  // in strict mode and fail silently outside it. Either way it must not.
  assert.doesNotThrow(() => register(ctx, fakeApi()))
})

test('logs through ctx.log, never through console', () => {
  const ctx = fakeCtx()
  register(ctx, fakeApi())
  assert.strictEqual(ctx.logs.length, 1, 'expected exactly one logger to be taken')
  const { log } = ctx.logs[0]
  assert.strictEqual(log.info.calls.length, 1)
  assert.strictEqual(log.info.calls[0][0], 'registered')
})

test('carries no hidden state between calls', () => {
  // Core calls register() exactly once, and the `once()` guard that enforces
  // that lives in core's `api` — not here. What this asserts is the module's
  // own half of it: registering into a second `api` produces the same result as
  // the first, so nothing is memoised at file scope where a re-register would
  // silently do less than it appears to.
  const first = fakeApi()
  const second = fakeApi()
  register(fakeCtx(), first)
  register(fakeCtx(), second)
  assert.deepStrictEqual(second.record, first.record)
})