Stubbing a function that does not belong to an object

[Kier Borromeo]

I'd like to stub a mere function that doesn't belong to an object. Is this possible? sinon.stub's api seems to accept only an object, and a property name (the fn).

For example:

var jwt = function () {

  // transform stuff

}

var thingToBeTested = function(x) { 

  return jwt(x);

}

describe('Thing', () => {

  it('should return a jwt-ed x', () => {

    expect(thingToBeTested(5)).to.equal(/* jwt-ed */)

  });

});

[Jonathon Creenaune]

You can definitely create a standalone stub using

var jwtStub = sinon.stub();

http://jsbin.com/babexuwesa/1/edit?html,js,output

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[Kier Borromeo]

I think I should've stated that I'm using CommonJS `require` to get `jwt`.

[Jonathon Creenaune]

In that case you have a couple of options:

- refactor your thingToBeTested code to be a factory. ie, your module would be a factory that takes the jwt function instead of require'ing jwt from inside thingToBeTested:

// thingToBeTested.js

// note: does not require jwt.js

module.exports = function thingToBeTestedFactory(jwt) {

  return function thingToBeTested(x) {

    return jwt(x);

  };

}

in your code:

// app-setup.js

var jwt = require('./jwt.js'),

  thingToBeTested = require('./thingToBeTested.js')(jwt);

in your test:

// test-thingToBeTested.js

var jwtStub = sinon.stub();

var thingToBeTested = require('./thingToBeTested.js')(jwtStub);

- alternatively, I'm not sure if there's a way to stub require() deps in CommonJS. In the browser / AMD, I've used Squire.js https://github.com/iammerrick/Squire.js/ to mock out modules.

[Travis Kaufman]

There's also rewire (https://github.com/jhnns/rewire) which has been extremely handy in the past for me!

[Morgan Roderick]

If you're not going with the dependency injection route, you should check out

https://github.com/thlorenz/proxyquire

/Morgan