Installation:

npm install sinon 

It is simple and easy to use. You can easily fake any interface using sinon. Here, I am going to tell how to use sinon to make a stub of any ORM provided method in node.js.

Sample code:

const sinon = require('sinon');
const expect = require('unexpected');
const Chance = require('chance');

const chance = new Chance();

describe('claim route', () => {

    const baseUrl = '/api/v1/claim';
    const middleware = server(0, true);
    let token = null;

    beforeEach(cb => {
        /** @ignore **/
        function authenticated(authenticatedToken) {
            token = authenticatedToken;
            cb();
        }

        ampsInitialize(() => {
            middlewareHelpers.beforeEach(middleware, 'jcowgar', authenticated);
        });
    });

    afterEach(() => {
        middlewareHelpers.afterEach();
    });


    describe('insert', () => {
        const insertUrl = `${baseUrl}/add-claim`;


        it('creates a new claim successfully.', cb => {
            sinon.stub(Claim, 'insertAndFetch', insertImpl);

            const data = {
                clientId: 192,
                groupAbbreviation: 'WEL0065'
            };
            request(middleware)
                .post(insertUrl)
                .send(data)
                .set('Accept', 'application/json')
                .set('Authorization', `Bearer ${token}`)
                .expect(httpConstants.STATUS_CREATED_201)
                .end((err, res) => {
                    Claim.insertAndFetch.restore();
                    if (err) {
                        cb(err);
                    } else {
                        expect(res.status, 'to equal', httpConstants.STATUS_CREATED_201);
                        cb();
                    }
                });
        });

    });
});

As, I am using objection.js ORM of node so my save() method is insertAndFetch() for me, I have stubbed insertAndFetch() method for my test case.

It will not make a call to db to create a record instead it will invoke my stubbed method.