Test: rebalancing recommend 테스트코드 작성

__tests__/api/isa-rebalancing-api.test.ts

@@ -0,0 +1,182 @@
+/**
+ * @jest-environment node
+ */
+import { getServerSession } from 'next-auth';
+import { NextRequest } from 'next/server';
+import { GET } from '@/app/api/isa/rebalancing/route';
+
+// 모킹 설정
+jest.mock('next-auth');
+jest.mock('@/services/isa/rebalancing-service', () => ({
+  RebalancingService: jest.fn(),
+  InvestmentProfileNotFoundError: class InvestmentProfileNotFoundError extends Error {
+    constructor() {
+      super('투자 성향 정보가 없습니다.');
+      this.name = 'InvestmentProfileNotFoundError';
+    }
+  },
+  ISAAccountNotFoundError: class ISAAccountNotFoundError extends Error {
+    constructor() {
+      super('ISA 계좌 정보가 없습니다.');
+      this.name = 'ISAAccountNotFoundError';
+    }
+  },
+}));
+
+const mockRebalancingService = {
+  getRebalancingRecommendation: jest.fn(),
+};
+
+const {
+  RebalancingService,
+  InvestmentProfileNotFoundError,
+  ISAAccountNotFoundError,
+} = require('@/services/isa/rebalancing-service');
+
+(RebalancingService as jest.Mock).mockImplementation(
+  () => mockRebalancingService
+);
+
+describe('GET /api/isa/rebalancing', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  describe('인증 테스트', () => {
+    it('인증되지 않은 사용자는 401 에러를 반환한다', async () => {
+      // Given
+      (getServerSession as jest.Mock).mockResolvedValue(null);
+
+      // When
+      const req = new NextRequest('http://localhost:3000/api/isa/rebalancing');
+      const res = await GET(req);
+      const json = await res.json();
+
+      // Then
+      expect(res.status).toBe(401);
+      expect(json.message).toBe('인증되지 않은 사용자입니다.');
+    });
+
+    it('세션에 사용자 ID가 없으면 401 에러를 반환한다', async () => {
+      // Given
+      (getServerSession as jest.Mock).mockResolvedValue({
+        user: {},
+      });
+
+      // When
+      const req = new NextRequest('http://localhost:3000/api/isa/rebalancing');
+      const res = await GET(req);
+      const json = await res.json();
+
+      // Then
+      expect(res.status).toBe(401);
+      expect(json.message).toBe('인증되지 않은 사용자입니다.');
+    });
+  });
+
+  describe('서비스 로직 테스트', () => {
+    beforeEach(() => {
+      (getServerSession as jest.Mock).mockResolvedValue({
+        user: { id: '123' },
+      });
+    });
+
+    it('투자 성향 정보가 없으면 404 에러를 반환한다', async () => {
+      // Given
+      mockRebalancingService.getRebalancingRecommendation.mockRejectedValue(
+        new InvestmentProfileNotFoundError()
+      );
+
+      // When
+      const req = new NextRequest('http://localhost:3000/api/isa/rebalancing');
+      const res = await GET(req);
+      const json = await res.json();
+
+      // Then
+      expect(res.status).toBe(404);
+      expect(json.message).toBe('투자 성향 정보가 없습니다.');
+      expect(
+        mockRebalancingService.getRebalancingRecommendation
+      ).toHaveBeenCalledWith(BigInt('123'));
+    });
+
+    it('ISA 계좌 정보가 없으면 404 에러를 반환한다', async () => {
+      // Given
+      mockRebalancingService.getRebalancingRecommendation.mockRejectedValue(
+        new ISAAccountNotFoundError()
+      );
+
+      // When
+      const req = new NextRequest('http://localhost:3000/api/isa/rebalancing');
+      const res = await GET(req);
+      const json = await res.json();
+
+      // Then
+      expect(res.status).toBe(404);
+      expect(json.message).toBe('ISA 계좌 정보가 없습니다.');
+    });
+
+    it('성공적으로 리밸런싱 추천 결과를 반환한다', async () => {
+      // Given
+      const mockResult = {
+        recommendedPortfolio: [
+          { category: '국내 주식', percentage: 25 },
+          { category: '해외 주식', percentage: 25 },
+          { category: '채권', percentage: 40 },
+          { category: 'ELS', percentage: 5 },
+          { category: '펀드', percentage: 5 },
+        ],
+        score: 85.5,
+        rebalancingOpinions: [
+          {
+            category: '국내 주식',
+            userPercentage: 30,
+            recommendedPercentage: 25,
+            opinion: '비중 축소 필요',
+            detail: '국내 주식 비중이 권장수준보다 5.0%p 높습니다.',
+          },
+          {
+            category: '해외 주식',
+            userPercentage: 20,
+            recommendedPercentage: 25,
+            opinion: '비중 확대 필요',
+            detail:
+              '해외 주식 비중이 권장수준보다 5.0%p 낮습니다. 해당 자산군에 대한 투자를 늘리는 것을 추천합니다.',
+          },
+        ],
+      };
+
+      mockRebalancingService.getRebalancingRecommendation.mockResolvedValue(
+        mockResult
+      );
+
+      // When
+      const req = new NextRequest('http://localhost:3000/api/isa/rebalancing');
+      const res = await GET(req);
+      const json = await res.json();
+
+      // Then
+      expect(res.status).toBe(200);
+      expect(json).toEqual(mockResult);
+      expect(
+        mockRebalancingService.getRebalancingRecommendation
+      ).toHaveBeenCalledWith(BigInt('123'));
+    });
+
+    it('예상치 못한 에러가 발생하면 500 에러를 반환한다', async () => {
+      // Given
+      mockRebalancingService.getRebalancingRecommendation.mockRejectedValue(
+        new Error('예상치 못한 에러')
+      );
+
+      // When
+      const req = new NextRequest('http://localhost:3000/api/isa/rebalancing');
+      const res = await GET(req);
+      const json = await res.json();
+
+      // Then
+      expect(res.status).toBe(500);
+      expect(json.message).toBe('서버 오류가 발생했습니다.');
+    });
+  });
+});