From 265c1ea362ef77b661aebc20f90a93f303d07428 Mon Sep 17 00:00:00 2001
From: victolee0 <39608452+victolee0@users.noreply.github.com>
Date: Mon, 11 Dec 2023 23:15:26 +0900
Subject: [PATCH] =?UTF-8?q?[BE/#213]=20=ED=95=99=EC=8A=B5=20=EA=B8=B0?=
 =?UTF-8?q?=EB=A1=9D=20=ED=85=8C=EC=8A=A4=ED=8A=B8=EC=BD=94=EB=93=9C=20?=
 =?UTF-8?q?=EC=9E=91=EC=84=B1=20(#416)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

* test: 학습 기록 테스트코드 작성

* refactor: 시간 오프셋 찾기
---
 BE/src/study-logs/study-logs.service.spec.ts | 82 ++++++++++++++++++++
 BE/src/study-logs/study-logs.service.ts      |  3 +-
 2 files changed, 84 insertions(+), 1 deletion(-)

diff --git a/BE/src/study-logs/study-logs.service.spec.ts b/BE/src/study-logs/study-logs.service.spec.ts
index cfb556f..0d70f5e 100644
--- a/BE/src/study-logs/study-logs.service.spec.ts
+++ b/BE/src/study-logs/study-logs.service.spec.ts
@@ -111,4 +111,86 @@ describe('StudyLogsService', () => {
       ).rejects.toThrow(BadRequestException);
     });
   });
+
+  describe('.calculateLearningTimes()', () => {
+    it('학습한 시간이 자정을 지나는 경우 날짜 별로 시간을 나눈다 (한국 시간)', () => {
+      const result = service.calculateLearningTimes(
+        '2023-11-12T01:00:00+09:00',
+        7200,
+      );
+      expect(result).toEqual([
+        {
+          started_at: '2023-11-11T14:00:00.000Z',
+          date: '2023-11-11',
+          learning_time: 3600,
+        },
+        {
+          started_at: '2023-11-11T15:00:00.000Z',
+          date: '2023-11-12',
+          learning_time: 3600,
+        },
+      ]);
+    });
+    it('학습한 시간이 자정을 지나는 경우 날짜 별로 시간을 나눈다 (미국 시간)', () => {
+      const result = service.calculateLearningTimes(
+        '2023-11-12T01:00:00-0500',
+        7200,
+      );
+      expect(result).toEqual([
+        {
+          started_at: '2023-11-12T04:00:00.000Z',
+          date: '2023-11-11',
+          learning_time: 3600,
+        },
+        {
+          started_at: '2023-11-12T05:00:00.000Z',
+          date: '2023-11-12',
+          learning_time: 3600,
+        },
+      ]);
+    });
+
+    it('학습한 시간이 자정을 지나지 않는 경우, 하루에 대한 학습 시간을 반환한다. (한국 시간)', () => {
+      const result = service.calculateLearningTimes(
+        '2023-11-12T02:00:00+09:00',
+        7200,
+      );
+      expect(result).toEqual([
+        {
+          started_at: '2023-11-11T15:00:00.000Z',
+          date: '2023-11-12',
+          learning_time: 7200,
+        },
+      ]);
+    });
+
+    it('학습한 시간이 자정을 지나지 않는 경우, 하루에 대한 학습 시간을 반환한다. (미국 시간)', () => {
+      const result = service.calculateLearningTimes(
+        '2023-11-12T02:00:00-0500',
+        7200,
+      );
+      expect(result).toEqual([
+        {
+          started_at: '2023-11-12T05:00:00.000Z',
+          date: '2023-11-12',
+          learning_time: 7200,
+        },
+      ]);
+    });
+  });
+
+  describe('calculatePercentage()', () => {
+    it('유저의 총 학습 시간 기준 전체 유저의 학습 시간에 대한 백분율을 반환한다.', async () => {
+      for (let i = 1; i <= 4; i++) {
+        jest.spyOn(repository, 'query').mockResolvedValueOnce([
+          { user_id: 1, total_time: 40000 },
+          { user_id: 2, total_time: 20000 },
+          { user_id: 3, total_time: 5000 },
+          { user_id: 4, total_time: 1000 },
+        ]);
+        jest.spyOn(usersRepository, 'count').mockResolvedValueOnce(4);
+        expect(await service.calculatePercentage(i, '', '')).toEqual(25 * i);
+      }
+    });
+  });
 });
diff --git a/BE/src/study-logs/study-logs.service.ts b/BE/src/study-logs/study-logs.service.ts
index 6325f12..2cdab9c 100644
--- a/BE/src/study-logs/study-logs.service.ts
+++ b/BE/src/study-logs/study-logs.service.ts
@@ -73,7 +73,8 @@ export class StudyLogsService {
     created_at: string,
     learning_time: number,
   ): { started_at: string; date: string; learning_time: number }[] {
-    const finishedAt = moment(new Date(created_at));
+    const offset = created_at.split(/\d\d:\d\d:\d\d/)[1];
+    const finishedAt = moment(created_at).utcOffset(offset);
     const startedAt = finishedAt.clone().subtract(learning_time, 's');
     if (startedAt.get('date') !== finishedAt.get('date')) {
       return [