How to unit test 'private' utility function in nodejs

Question

I\'m currently writing some tests for a nodejs application. assume that I have a module like this:

module.exports = function myModule(moduleParam) {
    var some         


        

Answer 1

Since i find tests to be a useful tool beyond unit testing and TDD (this SO answer makes a good argument), I made an npm package to help in cases like yours: require-from.

In you example this is how you would use it:

module-file.js:

function helper(param) {
    return param + someVar;
}

module.exports = function myModule(moduleParam) {
    var someVar;
    ....
    ....
    return {
        doSomething: function (bar) {
            ....
            ....
            var foo = helper(bar);
            ....
            ....
        }
    };
};
module.helperExports = helper;

importing-file.js:

var requireFrom = require('require-from');
var helper = requireFrom('helperExports', './module-file'));
var public = requireFrom('exports', './module-file')); // same as require('./module-file')