Extend portfolio calculator tests by performance of date ranges

apps/api/src/app/portfolio/calculator/portfolio-calculator-test-utils.ts

@@ -1,4 +1,10 @@
-import { ExportResponse } from '@ghostfolio/common/interfaces';
+import { PortfolioCalculator } from '@ghostfolio/api/app/portfolio/calculator/portfolio-calculator';
+import { getIntervalFromDateRange } from '@ghostfolio/common/calculation-helper';
+import {
+  ExportResponse,
+  HistoricalDataItem
+} from '@ghostfolio/common/interfaces';
+import { DateRange } from '@ghostfolio/common/types';
 
 import { readFileSync } from 'node:fs';
 
@@ -38,6 +44,33 @@ export const userDummyData = {
   id: 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx'
 };
 
+/**
+ * Returns the last chart item of getPerformance() for each date range
+ */
+export async function getPerformanceByDateRange({
+  dateRanges,
+  portfolioCalculator
+}: {
+  dateRanges: DateRange[];
+  portfolioCalculator: PortfolioCalculator;
+}): Promise<{ [dateRange: string]: HistoricalDataItem }> {
+  const performanceByDateRange: { [dateRange: string]: HistoricalDataItem } =
+    {};
+
+  for (const dateRange of dateRanges) {
+    const { endDate, startDate } = getIntervalFromDateRange({ dateRange });
+
+    const { chart } = await portfolioCalculator.getPerformance({
+      end: endDate,
+      start: startDate
+    });
+
+    performanceByDateRange[dateRange] = chart.at(-1);
+  }
+
+  return performanceByDateRange;
+}
+
 export function loadExportFile(filePath: string): ExportResponse {
   return JSON.parse(readFileSync(filePath, 'utf8'));
 }