Cannot rewire within IIFE

[masimplo]

My source looks like:

(function (sut) {
    'use strict';
    var testVar = 'Hello from original';

    sut.testMe = function(){
         return testvar;
    }
}(module.exports));

trying to test this gives me a failure:

(function () {
    'use strict';
    var rewire = require("rewire");
    var sut = rewire('../../lib/sut');
    sut.__set__('testVar', 'hello from mock');

    describe('Rewire', function(){
         it('fails', function(){
              expect(sut.testMe()).to.equal('Hello from mock');
         })
    }
)

The mock is not respected and the source has the original value for the testVar.
But if I remove my src from the IIFE then everything works. Am I doing something wrong?

[jhnns]

Nope, that is actually a limitation by JavaScript. It is not possible to access a function's scope...