Require Mock

This is another library that manages to allow for mocking on require modules from a module that you're unit testing.

How it differs:

• It allows for mocking of the ENTIRE module, even if that module is a function.
• It works without touching the require cache, so it will work on native modules as well (such as fs).
• Doesn't spawn a vm.
• This module itself doesn't touch the inside of require, though it leverages require-middleware which redefines what require means.

Basic usage

// This call to the real dependency is only required to quickly stub out the entire thing.
// You can pass any sort of object or function to `with()`
var realfs = require('fs');

// From this point on out, all require calls will go through the mocker
var requireMock = require('require-hijack');

var fakeFs = sinon.stub(fs);
requiremock.replace('fs').with(fakeFs);

var myModule = require('../lib/myModule');
myModule.readDirectory();

fakeFs.readdir.should.have.been.called;

Note - Mock your sub-module's dependencies before loading your sub-module, otherwise those require calls will happen prior to the mocking goodness!