test: cover portfolio UI API contract

frontend/src/api/portfolio.test.ts

@@ -0,0 +1,17 @@
+import assert from 'node:assert/strict';
+import { getPortfolioHistory, getPortfolioOverview, getPortfolioPerformance } from './portfolio';
+
+const calls: string[] = [];
+const originalFetch = globalThis.fetch;
+globalThis.fetch = async (input) => {
+  calls.push(String(input));
+  return new Response(JSON.stringify({ accounts: [] }), { status: 200, headers: { 'Content-Type': 'application/json' } });
+};
+
+try {
+  await Promise.all([getPortfolioOverview(), getPortfolioHistory(), getPortfolioPerformance()]);
+  assert.deepEqual(calls.sort(), ['/api/portfolio', '/api/portfolio/history', '/api/portfolio/performance']);
+  console.log('portfolio API contract: OK');
+} finally {
+  globalThis.fetch = originalFetch;
+}