Prototype two-player four-faction setup

tests/two-player-controls.test.ts

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+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { createElement } from 'react';
+import { renderToStaticMarkup } from 'react-dom/server';
+import type { GameView } from '../game/engine';
+import { TwoPlayerControls } from '../components/two-player-controls';
+
+const base = {
+  code: 'TWOPLAY2', status: 'lobby', host: 'a', me: 'a', expansions: [],
+  players: [
+    { id: 'a', name: 'Ali', faction: 'atreides', ready: true },
+    { id: 'b', name: 'Bea', faction: 'harkonnen', ready: false },
+    { id: 'c', name: 'Ali', faction: 'emperor', ready: false },
+  ],
+  twoPlayerControllers: { version: 1, controllers: [
+    { id: 'one', seats: ['a', 'c'] }, { id: 'two', seats: ['b'] },
+  ] },
+  controlledFactionSeats: [
+    { id: 'a', name: 'Ali', faction: 'atreides' },
+    { id: 'c', name: 'Ali', faction: 'emperor' },
+  ],
+} as unknown as GameView;
+const noop = () => {};
+function render(game: GameView, pendingEntry = false) {
+  return renderToStaticMarkup(createElement(TwoPlayerControls, {
+    game, disabled: pendingEntry, pendingEntry, entryRoom: game.code, entryProblem: '',
+    retryDisabled: false, onModeChange: noop, onSwitch: noop, onAdd: noop, onRetry: noop,
+  }));
+}
+
+void test('faction selector only offers the authenticated controller seats', () => {
+  const html = render(base);
+  assert.match(html, /Active faction/);
+  assert.match(html, /value="a"/);
+  assert.match(html, /value="c"/);
+  assert.doesNotMatch(html, /<option[^>]*value="b"/);
+  assert.match(html, /Player 2: Harkonnen \(not ready\) — needs a second faction/);
+});
+
+void test('second faction choices omit taken factions and disabled expansions', () => {
+  const html = render({ ...base, me: 'b', controlledFactionSeats: [{ id: 'b', name: 'Bea', faction: 'harkonnen' }] });
+  assert.match(html, /Add your second faction/);
+  assert.match(html, /value="fremen"/);
+  assert.doesNotMatch(html, /<option[^>]*value="atreides"/);
+  assert.doesNotMatch(html, /<option[^>]*value="ixians"/);
+});
+
+void test('an unresolved request stays visible with an explicit retry', () => {
+  const html = render(base, true);
+  assert.match(html, /Retry saved second-faction request/);
+  assert.match(html, /never retried automatically/);
+  assert.match(html, /<select[^>]*disabled/);
+});