init

tests/db.test.ts

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+/**
+ * db.ts 단위 테스트
+ * - getTodayRecords(): UTC로 저장된 measured_at과 타임존 로컬 날짜 비교가
+ *   올바르게 동작해야 함 (이슈 #5)
+ */
+import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
+import fs from 'fs';
+import os from 'os';
+import path from 'path';
+import { SpeedDatabase, SpeedRecord } from '../src/db';
+
+function makeRecord(overrides: Partial<SpeedRecord>): Omit<SpeedRecord, 'id'> {
+  return {
+    isp: 'skt',
+    measured_at: new Date().toISOString(),
+    download_mbps: 100,
+    upload_mbps: 100,
+    ping_ms: 10,
+    sla_result: 'fail',
+    complaint_filed: true,
+    complaint_result: 'success',
+    raw_data: '{}',
+    error: '',
+    ...overrides,
+  };
+}
+
+describe('SpeedDatabase.getTodayRecords (timezone-aware)', () => {
+  let tmpDir: string;
+  let db: SpeedDatabase;
+
+  beforeEach(() => {
+    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'dmsk-db-'));
+    db = new SpeedDatabase(path.join(tmpDir, 'test.db'));
+  });
+
+  afterEach(() => {
+    db.close();
+    fs.rmSync(tmpDir, { recursive: true, force: true });
+  });
+
+  it('treats UTC record from KST early morning as today (issue #5)', () => {
+    // KST 2026-04-18 04:00 = UTC 2026-04-17 19:00
+    const utcEarlyMorning = '2026-04-17T19:00:00.000Z';
+    db.save(makeRecord({ measured_at: utcEarlyMorning }));
+
+    // 같은 KST 날짜(2026-04-18)의 06:00 = UTC 2026-04-17 21:00 시점 기준으로 조회
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date('2026-04-17T21:00:00.000Z'));
+    try {
+      const records = db.getTodayRecords('Asia/Seoul');
+      expect(records).toHaveLength(1);
+      expect(records[0].measured_at).toBe(utcEarlyMorning);
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  it('hasTodayComplaintSuccess returns true for KST early-morning success', () => {
+    db.save(
+      makeRecord({
+        measured_at: '2026-04-17T19:00:00.000Z', // KST 2026-04-18 04:00
+        complaint_result: 'success',
+      })
+    );
+
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date('2026-04-17T21:00:00.000Z')); // KST 06:00
+    try {
+      expect(db.hasTodayComplaintSuccess('Asia/Seoul')).toBe(true);
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  it('excludes records from previous KST day', () => {
+    // KST 2026-04-17 23:00 = UTC 2026-04-17 14:00 (어제)
+    db.save(makeRecord({ measured_at: '2026-04-17T14:00:00.000Z' }));
+
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date('2026-04-17T21:00:00.000Z')); // KST 2026-04-18 06:00
+    try {
+      const records = db.getTodayRecords('Asia/Seoul');
+      expect(records).toHaveLength(0);
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+});