feat: improve analysis and release v1.0.2

src/lib/engine/score-probability.test.ts

@@ -0,0 +1,90 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+import { estimateScoreAchievementProbabilities } from './index.ts';
+import type { ExactSongChart, OptimizerCard } from './types.ts';
+
+function card(
+  id: string,
+  scoreUpPercent: number,
+  probabilityPercent: number,
+  durationSeconds = 1
+): OptimizerCard {
+  return {
+    id,
+    name: id,
+    active: { cooldownSeconds: 1, durationSeconds, scoreUpPercent, probabilityPercent },
+    special: { durationSeconds: 0, scoreUpPercent: 0 },
+    allowedCooldownReductions: [0]
+  };
+}
+
+function chart(times: number[], specialStartSeconds: (number | null)[] = []): ExactSongChart {
+  return {
+    songId: 'test',
+    difficulty: 'expert',
+    durationSeconds: 5,
+    scoreRatio: 1,
+    notes: times.map((timeSeconds) => ({ timeSeconds, type: 'regular', isFlick: false })),
+    specialStartSeconds
+  };
+}
+
+test('한 번의 발동이 여러 노트에 영향을 주어도 최고점 확률은 한 번만 곱한다', () => {
+  const result = estimateScoreAchievementProbabilities(
+    [card('main', 100, 50, 0.9)],
+    { main: 0 },
+    chart([1.1, 1.5]),
+    { perfectNoteScore: 100, sampleCount: 1_000, seed: 1 }
+  );
+  assert.equal(result.maximum, 0.5);
+});
+
+test('최고점에 영향을 주지 않는 약한 액티브는 최고점 확률에서 제외한다', () => {
+  const result = estimateScoreAchievementProbabilities(
+    [card('strong', 100, 50), card('weak', 20, 10)],
+    { strong: 0, weak: 0 },
+    chart([1.1]),
+    { perfectNoteScore: 100, sampleCount: 1_000, seed: 2 }
+  );
+  assert.equal(result.maximum, 0.5);
+});
+
+test('같은 최고 효과의 액티브가 겹치면 둘 중 하나가 발동할 확률을 사용한다', () => {
+  const result = estimateScoreAchievementProbabilities(
+    [card('left', 100, 50), card('right', 100, 50)],
+    { left: 0, right: 0 },
+    chart([1.1]),
+    { perfectNoteScore: 100, sampleCount: 1_000, seed: 3 }
+  );
+  assert.equal(result.maximum, 0.75);
+});
+
+test('스페셜의 액티브 발동률 증가를 발동 시점에 적용한다', () => {
+  const main = card('main', 100, 50);
+  const support: OptimizerCard = {
+    ...card('support', 0, 0),
+    special: { durationSeconds: 3, scoreUpPercent: 0, activationRateUpPercent: 50 }
+  };
+  const result = estimateScoreAchievementProbabilities(
+    [main, support],
+    { main: 0, support: 0 },
+    chart([1.1], [null, 0]),
+    { perfectNoteScore: 100, sampleCount: 1_000, seed: 4 }
+  );
+  assert.equal(result.maximum, 0.75);
+});
+
+test('확정 발동이면 모든 달성 확률이 100%다', () => {
+  const result = estimateScoreAchievementProbabilities(
+    [card('main', 100, 100)],
+    { main: 0 },
+    chart([1.1, 2.1, 3.1]),
+    { perfectNoteScore: 100, sampleCount: 1_000, seed: 5 }
+  );
+  assert.deepEqual(result, {
+    maximum: 1,
+    atLeast99Percent: 1,
+    atLeast95Percent: 1,
+    samples: 1_000
+  });
+});