feat: complete placement analysis workflow

src/lib/engine/score.test.ts

@@ -0,0 +1,76 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { calculateExactScore, perfectNoteScoreFromPower, scoreRatioFromNotes } from './index.ts';
+import type { ExactSongChart, OptimizerCard } from './types.ts';
+
+const inactiveCard: OptimizerCard = {
+  id: 'card',
+  name: '카드',
+  active: { cooldownSeconds: 999, durationSeconds: 1, scoreUpPercent: 100, probabilityPercent: 100 },
+  special: { durationSeconds: 0, scoreUpPercent: 0 }
+};
+
+function chart(notes: ExactSongChart['notes']): ExactSongChart {
+  return { songId: 'test', difficulty: 'expert', durationSeconds: 120, scoreRatio: 100, notes, specialStartSeconds: [] };
+}
+
+test('종합력과 악곡 비율로 PERFECT 1노트 기본점수를 계산한다', () => {
+  assert.equal(perfectNoteScoreFromPower(120_000, 200), 600);
+  assert.equal(perfectNoteScoreFromPower(120_100, 200), 600.5);
+  assert.equal(perfectNoteScoreFromPower(0, 200, 777), 777);
+});
+
+test('플릭 1.05배와 같은 시각 홀드 중간 판정의 단일 가중치로 환산비율을 계산한다', () => {
+  const ratio = scoreRatioFromNotes([
+    { timeSeconds: 1, type: 'regular', isFlick: false },
+    { timeSeconds: 2, type: 'regular', isFlick: true },
+    { timeSeconds: 3, type: 'mid', isFlick: false },
+    { timeSeconds: 3, type: 'mid', isFlick: false }
+  ]);
+  assert.ok(Math.abs(ratio - 2.15 * 0.3713416563352296) < 1e-12);
+});
+
+test('기본점수의 소수점을 유지하고 가창 보너스 적용 후 노트별로 올림한다', () => {
+  const result = calculateExactScore([inactiveCard], {}, chart([
+    { timeSeconds: 1, type: 'regular', isFlick: false }
+  ]), { perfectNoteScore: 1_354.507, directSongScoreBonusPercent: 10 });
+  assert.equal(result.baselineScore, 1_490);
+});
+
+test('100콤보부터 1% 콤보 보너스를 적용한다', () => {
+  const notes = Array.from({ length: 100 }, (_, index) => ({ timeSeconds: index, type: 'regular' as const, isFlick: false }));
+  const result = calculateExactScore([inactiveCard], {}, chart(notes), { perfectNoteScore: 600 });
+  assert.equal(result.baselineScore, 99 * 600 + 606);
+});
+
+test('홀드 중간 노트는 10%, 플릭은 1.05배로 계산한다', () => {
+  const result = calculateExactScore([inactiveCard], {}, chart([
+    { timeSeconds: 1, type: 'mid', isFlick: false },
+    { timeSeconds: 2, type: 'regular', isFlick: true }
+  ]), { perfectNoteScore: 600 });
+  assert.equal(result.baselineScore, 60 + 630);
+});
+
+test('같은 시각에 중복된 홀드 중간 판정은 한 번만 계산한다', () => {
+  const result = calculateExactScore([inactiveCard], {}, chart([
+    { timeSeconds: 1, type: 'mid', isFlick: false },
+    { timeSeconds: 1, type: 'mid', isFlick: false }
+  ]), { perfectNoteScore: 600 });
+  assert.equal(result.baselineScore, 60);
+  assert.equal(result.notes.length, 1);
+});
+
+test('액티브 발동 확률과 스페셜 스코어 서포트를 기대 점수에 반영한다', () => {
+  const card: OptimizerCard = {
+    id: 'score',
+    name: '스코어 카드',
+    active: { cooldownSeconds: 1, durationSeconds: 1, scoreUpPercent: 100, probabilityPercent: 50 },
+    special: { durationSeconds: 2, scoreUpPercent: 100 }
+  };
+  const result = calculateExactScore([card], {}, {
+    ...chart([{ timeSeconds: 1, type: 'regular', isFlick: false }]),
+    specialStartSeconds: [0]
+  }, { perfectNoteScore: 600 });
+  assert.equal(result.expectedScore, 1_200);
+  assert.equal(result.theoreticalMaxScore, 1_800);
+});