refactor: centralize provider projections

src/modules/investments/portfolio/application/portfolio.service.spec.ts

@@ -129,6 +129,43 @@ describe('persistent portfolio projection', () => {
     ]);
     expect(snapshot.cashBalances).toEqual([{ currency: 'RUB', value: '1' }]);
   });
+  it('keeps net-zero cash groups, missing valuations and incompatible currencies distinct', async () => {
+    repository.reserve.mockResolvedValueOnce({
+      launch: true,
+      work: { id: 'work', attemptId: 'attempt' },
+    });
+    tbank.getPortfolio.mockResolvedValue({ positions: [
+      { quantity: { units: '1' }, currentPrice: { units: '3' } },
+      {
+        quantity: { units: '1' },
+        currentPrice: { currency: 'USD', units: '3' },
+        averagePositionPrice: { currency: 'RUB', units: '2' },
+      },
+    ] });
+    tbank.getPositions.mockResolvedValue({ money: [
+      { currency: 'rub', units: '2' },
+      { currency: 'RUB', units: '-2' },
+      { units: '99' },
+      { currency: 'EUR', units: '1' },
+    ] });
+    await service.request('user', 'private', 'a');
+    for (let index = 0; index < 10 && !repository.publish.mock.calls.length; index++) {
+      await immediate();
+    }
+    const snapshot = (repository.publish.mock.calls as [unknown, string, PortfolioDto][])[0][2];
+    expect(snapshot.cashBalances).toEqual([
+      { currency: 'RUB', value: '0' },
+      { currency: 'EUR', value: '1' },
+    ]);
+    expect(snapshot.totalsByCurrency).toEqual([
+      { currency: 'EUR', value: '1' },
+      { currency: 'USD', value: '3' },
+    ]);
+    expect(snapshot.positions[0].currentValue).toBeNull();
+    expect(snapshot.positions[1].absoluteReturn).toBeNull();
+    expect(snapshot.positions[1].averagePurchasePrice).toEqual({ currency: 'RUB', value: '2' });
+  });
+
   it('does not turn a missing account snapshot into aggregate zero; summaries stay independent', async () => {
     const snapshot: PortfolioDto = {
       lastSuccessfulAt: membershipAt.toISOString(),