salix/modules/invoiceIn/back/methods/invoice-in/specs/summary.spec.js

const app = require('vn-loopback/server/server');

describe('invoiceIn summary()', () => {
    it('should return a summary object containing data from one invoiceIn', async() => {
        const summary = await app.models.InvoiceIn.summary(1);

        expect(summary.supplierRef).toEqual('1234');
    });
});