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');
    });
});