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

describe('sale updateQuantity()', () => {
    it('should throw an error if the quantity is not a number', async() => {
        let error;

        await app.models.Sale.updateQuantity(1, 'wrong quantity!')
            .catch(response => {
                expect(response).toEqual(new Error('The value should be a number'));
                error = response;
            });

        expect(error).toBeDefined();
    });

    it('should throw an error if the quantity is greater than it should be', async() => {
        let error;

        await app.models.Sale.updateQuantity(1, 99)
            .catch(response => {
                expect(response).toEqual(new Error('The new quantity should be smaller than the old one'));
                error = response;
            });

        expect(error).toBeDefined();
    });

    it('should update the quantity of a given sale current line', async() => {
        let originalLineData = await app.models.Sale.findOne({where: {id: 1}, fields: ['quantity']});

        expect(originalLineData.quantity).toEqual(5);

        await app.models.Sale.updateQuantity(1, 4);

        let modifiedLineData = await app.models.Sale.findOne({where: {id: 1}, fields: ['quantity']});

        expect(modifiedLineData.quantity).toEqual(4);

        await app.models.Sale.update({id: 1}, {quantity: 5});

        let resetLineDataValues = await app.models.Sale.findOne({where: {id: 1}, fields: ['quantity']});

        expect(resetLineDataValues.quantity).toEqual(5);
    });
});