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MoqJS - Mocking Library for Javascript and Typescript

16 Apr 2016CPOL
Mocking library for JavaScript


This is a simple framework for testing JavaScript/typescript based on the .NET Moq framework.


I was a .NET programmer and was used to the Moq framework to do tests. When I switched to JavaScript, I had many options for mocking frameworks, but I was used to Moq and was surprised that there was no Moq implementation for JavaScript. So I decided to raise the glove and create one.


npm install moqjs --save-dev

Using the Code

The framework does not work exactly as Moq used to because of the lack of interfaces in run time.

So, the next best thing is to change the behaviour of existing objects.

This is why I decided the term mock is not appropriate and switched to the term mole which is more suitable here.

Some basic examples are given below:

// Create some object instance
var dog = new Dog();

// Create a mole for the object
var mole = new Mole(dog);

// Setup behavior
mole.setup(_dog =>'meat')).returns('Yum yum yum');

// Invoke
var result ='meat');

// Verify the given method was indeed called with the expected value exactly once
var isVerified = mole.verify(_dog =>'meat'), Times.exact(1));


1/4/2016 (version 1.1.0):

  • Change the tests to mocha + sinon + chai
  • Refactor the project to use require
  • Move the project from VisualStudio to plane folder project

14/4/2016 (version 1.1.1):

  • Added public License file


You can find more examples, the build and the code in my git:


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

United States United States
No Biography provided

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