salix/back/methods/collection/spec/setSaleQuantity.spec.js

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

describe('setSaleQuantity()', () => {
    it('should change quantity sale', async() => {
        const saleId = 30;
        const newQuantity = 10;

        const originalSale = await models.Sale.findById(saleId);

        await models.Collection.setSaleQuantity(saleId, newQuantity);
        const updateSale = await models.Sale.findById(saleId);

        expect(updateSale.originalQuantity).toEqual(originalSale.quantity);
        expect(updateSale.quantity).toEqual(newQuantity);
    });
});