ExpressJS: How to mock request handler next function with mocha - node.js

Question

I have an handler
public ensureAuthenticated(req: express.Request, res: express.Response, next: Function) {
// check header or url parameters or post parameters for token
var token = req.body.token || req.param('token') || req.headers['x-access-token'];
// decode token
if (token) {
// verifies secret and checks exp
jwt.verify(token, config.secret, function(err, decoded) {
if (err) {
return res.status(404).json({ success: false, message: 'Failed to authenticate token.' });
} else {
// if everything is good, save to request for use in other routes
next();
}
});
} else {
// if there is no token
// return an error
return res.status(403).send({
success: false,
message: 'No token provided.'
});
}
}
And here the route
app.post('/api/article/create', AuthenticationHelper.ensureAuthenticated, this.create);
In unit test, how can I mock the ensureAuthenticated to make sure it is authenticated.
sinon.stub(AuthenticationHelper, 'ensureAuthenticated').returns(true);

Answer 1

I will give you an example where I test it without using sinon.
This is my authentication-helper.js:
'use strict';
module.exports = function(jwt, config) {
return {
ensureAuthenticated: function (req, res, next) {
var token = req.body.token ||
req.param('token') ||
req.headers['x-access-token'];
if (token) {
jwt.verify(
token,
config.secret,
function(err, decoded) {
if (err) {
res
.status(404)
.json({
success: false,
message: 'Failed to auth.'
});
} else {
next();
}
}
);
} else {
res
.status(403)
.send({
success: false,
message: 'No token provided.'
});
}
}
};
}
And this is my test file:
'use strict';
var jwt = {};
jwt.verify = function (token, secret, fn) {
fn(null, 'something');
};
var config = {};
config.secret = 'shh';
var req = {};
req.body = {};
req.body.token = 'mytoken';
var res = {};
var AuthenticationHelper = require('./authentication-helper.js')(jwt, config);
describe('Test Express Middleware', function() {
it('should call next on middlware', function(done) {
var next = function () {
console.log('next was called');
done();
};
AuthenticationHelper.ensureAuthenticated(req, res, next);
});
});