✅ test: 주식 가격 상승률 기반 테스트 추가

packages/backend/src/stock/stock.service.spec.ts

@@ -1,3 +1,4 @@
+/* eslint-disable max-lines-per-function */
 import { instanceToPlain } from 'class-transformer';
 import { DataSource } from 'typeorm';
 import { Logger } from 'winston';
@@ -187,4 +188,71 @@ describe('StockService 테스트', () => {
       },
     ]);
   });
+
+  test('주식 상승률 기준 상위 데이터를 반환한다.', async () => {
+    const limit = 20;
+    // QueryBuilder Mock
+    const queryBuilderMock = {
+      leftJoin: jest.fn().mockReturnThis(),
+      select: jest.fn().mockReturnThis(),
+      orderBy: jest.fn().mockReturnThis(),
+      limit: jest.fn().mockReturnThis(),
+      getRawMany: jest.fn().mockResolvedValue([
+        {
+          id: 'A005930',
+          name: '삼성전자',
+          currentPrice: '100000.0',
+          changeRate: '2.5',
+          volume: '500000',
+          marketCap: '500000000000.00',
+        },
+        {
+          id: 'A051910',
+          name: 'LG화학',
+          currentPrice: '75000.0',
+          changeRate: '-1.2',
+          volume: '300000',
+          marketCap: '20000000000.00',
+        },
+      ]),
+    };
+
+    // Manager Mock
+    const managerMock = {
+      getRepository: jest.fn().mockReturnValue({
+        createQueryBuilder: jest.fn().mockReturnValue(queryBuilderMock),
+      }),
+    };
+    const dataSource = createDataSourceMock(managerMock);
+    const stockService = new StockService(dataSource as DataSource, logger);
+
+    const result = await stockService.getTopStocksByGainers(limit);
+
+    expect(managerMock.getRepository).toHaveBeenCalledWith(Stock);
+    expect(queryBuilderMock.orderBy).toHaveBeenCalledWith(
+      'stockLiveData.changeRate',
+      'DESC',
+    );
+    expect(queryBuilderMock.limit).toHaveBeenCalledWith(limit);
+    expect(queryBuilderMock.getRawMany).toHaveBeenCalled();
+
+    expect(instanceToPlain(result)).toEqual([
+      {
+        id: 'A005930',
+        name: '삼성전자',
+        currentPrice: 100000.0,
+        changeRate: 2.5,
+        volume: 500000,
+        marketCap: '500000000000.00',
+      },
+      {
+        id: 'A051910',
+        name: 'LG화학',
+        currentPrice: 75000.0,
+        changeRate: -1.2,
+        volume: 300000,
+        marketCap: '20000000000.00',
+      },
+    ]);
+  });
 });