expect-express

check common express unit test scenarios with expect

• setup your imports and configure expect-express

const router = require('express').Router();
const expect = require('expect');
const expectExpress = require('expect-express');
expect.extend(expectExpress);

• define your system under test

function responseMiddlware(req, res, next) {
    res.status(200).json({success: true});
}
function namedMiddleware(req, res, next) {
    next();
}

router.get('/:id', namedMiddleware, (req, res, next) => { next(); }, () => {});

• test if a route is defined by specifying an HTTP verb and a path

expect(router).toHaveRoute('GET', '/:id');

• test if a given route has params defined getRoute helper methods facilitates route selection

expect(expectExpress.helper.getRoute(router, 'GET', '/:id')).toHaveRouteParameter('id');

• test if specific middleware (function, name or anonymous) is defined for given route

expect(expectExpress.helper.getRoute(router, 'GET', '/:id')).toHaveMiddleware(namedMiddleware);
expect(expectExpress.helper.getRoute(router, 'GET', '/:id')).toHaveMiddleware('namedMiddleware');
expect(expectExpress.helper.getRoute(router, 'GET', '/:id')).toHaveMiddleware();

• test if middleware function returns expected response

const reqDefinition = {
    verb: 'POST',
    url: '/',
    payloadType: 'body',
    payload: { test: 'valid' }
};
expect(responseMiddleware).toRespondWith(reqDefinition, 200, {success: true});

• test if next was called in middleware

expect(namedMiddleware).toHaveCalledNext(reqDefinition);