feat: share choice modes and bracket editor

test/bracket.test.cjs

@@ -0,0 +1,25 @@
+const test = require('node:test');
+const assert = require('node:assert/strict');
+const bracket = require('../utils/bracket');
+
+function candidates(count) {
+  return Array.from({ length: count }, (_, index) => ({ id: String(index), name: `C${index}` }));
+}
+
+test('supports selecting several matches in the same round', () => {
+  const state = bracket.create(candidates(4));
+  assert.equal(bracket.chooseAt(state, 1, state.matches[1].right), false);
+  assert.equal(state.round, 1);
+  assert.equal(bracket.chooseAt(state, 0, state.matches[0].left), false);
+  assert.equal(state.round, 2);
+  assert.equal(bracket.choose(state, state.matches[0].left), true);
+  assert.equal(state.pool.length, 1);
+  assert.equal(state.decisions.length, 3);
+});
+
+test('odd candidates receive a deterministic bye', () => {
+  const state = bracket.create(candidates(3));
+  bracket.chooseAt(state, 0, state.matches[0].left);
+  assert.equal(state.round, 2);
+  assert.equal(state.matches[0].right.id, '2');
+});