Add test case: sell partially with huge gain (#1380)

* Add test case: sell partially with huge gain

apps/api/src/app/portfolio/current-rate.service.mock.ts

@@ -21,6 +21,17 @@ function mockGetValue(symbol: string, date: Date) {
 
       return { marketPrice: 0 };
 
+    case 'BTCUSD':
+      if (isSameDay(parseDate('2015-01-01'), date)) {
+        return { marketPrice: 314.25 };
+      } else if (isSameDay(parseDate('2017-12-31'), date)) {
+        return { marketPrice: 14156.4 };
+      } else if (isSameDay(parseDate('2018-01-01'), date)) {
+        return { marketPrice: 13657.2 };
+      }
+
+      return { marketPrice: 0 };
+
     case 'NOVN.SW':
       if (isSameDay(parseDate('2022-04-11'), date)) {
         return { marketPrice: 87.8 };

apps/api/src/app/portfolio/portfolio-calculator-btcusd-buy-and-sell-partially.spec.ts

@@ -0,0 +1,110 @@
+import { CurrentRateService } from '@ghostfolio/api/app/portfolio/current-rate.service';
+import { parseDate } from '@ghostfolio/common/helper';
+import Big from 'big.js';
+
+import { CurrentRateServiceMock } from './current-rate.service.mock';
+import { PortfolioCalculator } from './portfolio-calculator';
+
+jest.mock('@ghostfolio/api/app/portfolio/current-rate.service', () => {
+  return {
+    // eslint-disable-next-line @typescript-eslint/naming-convention
+    CurrentRateService: jest.fn().mockImplementation(() => {
+      return CurrentRateServiceMock;
+    })
+  };
+});
+
+describe('PortfolioCalculator', () => {
+  let currentRateService: CurrentRateService;
+
+  beforeEach(() => {
+    currentRateService = new CurrentRateService(null, null, null);
+  });
+
+  describe('get current positions', () => {
+    it.only('with BTCUSD buy and sell partially', async () => {
+      const portfolioCalculator = new PortfolioCalculator({
+        currentRateService,
+        currency: 'CHF',
+        orders: [
+          {
+            currency: 'CHF',
+            date: '2015-01-01',
+            dataSource: 'YAHOO',
+            fee: new Big(0),
+            name: 'Bitcoin USD',
+            quantity: new Big(2),
+            symbol: 'BTCUSD',
+            type: 'BUY',
+            unitPrice: new Big(320.43)
+          },
+          {
+            currency: 'CHF',
+            date: '2017-12-31',
+            dataSource: 'YAHOO',
+            fee: new Big(0),
+            name: 'Bitcoin USD',
+            quantity: new Big(1),
+            symbol: 'BTCUSD',
+            type: 'SELL',
+            unitPrice: new Big(14156.4)
+          }
+        ]
+      });
+
+      portfolioCalculator.computeTransactionPoints();
+
+      const spy = jest
+        .spyOn(Date, 'now')
+        .mockImplementation(() => parseDate('2018-01-01').getTime());
+
+      const currentPositions = await portfolioCalculator.getCurrentPositions(
+        parseDate('2015-01-01')
+      );
+
+      const investments = portfolioCalculator.getInvestments();
+
+      const investmentsByMonth = portfolioCalculator.getInvestmentsByMonth();
+
+      spy.mockRestore();
+
+      expect(currentPositions).toEqual({
+        currentValue: new Big('13657.2'),
+        errors: [],
+        grossPerformance: new Big('27172.74'),
+        grossPerformancePercentage: new Big('42.40043067128546016291'),
+        hasErrors: false,
+        netPerformance: new Big('27172.74'),
+        netPerformancePercentage: new Big('42.40043067128546016291'),
+        positions: [
+          {
+            averagePrice: new Big('320.43'),
+            currency: 'CHF',
+            dataSource: 'YAHOO',
+            firstBuyDate: '2015-01-01',
+            grossPerformance: new Big('27172.74'),
+            grossPerformancePercentage: new Big('42.40043067128546016291'),
+            investment: new Big('320.43'),
+            netPerformance: new Big('27172.74'),
+            netPerformancePercentage: new Big('42.40043067128546016291'),
+            marketPrice: 13657.2,
+            quantity: new Big('1'),
+            symbol: 'BTCUSD',
+            transactionCount: 2
+          }
+        ],
+        totalInvestment: new Big('320.43')
+      });
+
+      expect(investments).toEqual([
+        { date: '2015-01-01', investment: new Big('640.86') },
+        { date: '2017-12-31', investment: new Big('320.43') }
+      ]);
+
+      expect(investmentsByMonth).toEqual([
+        { date: '2015-01-01', investment: new Big('640.86') },
+        { date: '2017-12-01', investment: new Big('-14156.4') }
+      ]);
+    });
+  });
+});