init

backend/src/utils/invoice/sumInvoicePaymentAmountsAtomic.spec.ts

@@ -0,0 +1,17 @@
+import { sumInvoicePaymentAmountsAtomic } from './sumInvoicePaymentAmountsAtomic';
+
+describe('sumInvoicePaymentAmountsAtomic', () => {
+    it('returns zero when payments are missing or empty', () => {
+        expect(sumInvoicePaymentAmountsAtomic(undefined)).toBe('0');
+        expect(sumInvoicePaymentAmountsAtomic([])).toBe('0');
+    });
+
+    it('sums multiple payment amounts atomically', () => {
+        expect(
+            sumInvoicePaymentAmountsAtomic([
+                { amountAtomic: '100000000000' },
+                { amountAtomic: '250000000000' }
+            ])
+        ).toBe('350000000000');
+    });
+});