Intern vs Unitils comparison of testing frameworks
What are the differences between Intern and Unitils?


Programming language




Unit Testing, Functional Testing

Unit Testing, Intergration Testing

General info

Intern is minimal test system for JavaScript designed to write and run consistent.

Intern is a complete test system for JavaScript designed to help you write and run consistent, high-quality test cases for your JavaScript libraries and applications. Using Intern we can write tests in JavaScript and TypeScript using any style like TDD, and BDD. Intern can run unit tests in most browsers that support ECMAScript

Unitils is an open source library whose goal is to make unit and integration testing easy and maintainable.

Unitils is divided into modules, each of them providing support for a certain aspect of your unit and integration tests. For example if you need mocking for your tests, just include unitils-mock as a dependency, If you would also want to load DbUnit data sets, just include unitils-dbunit
Set of frameworks originating from SUnit (Smalltalk's testing framework). They share similar structure and functionality.



Allows testing code execution on the client, such as a web browser


Intern is a complete test system for JavaScript It Runs in the browser and can test any front-end component and functionality


You can perform unit tests on various components and functionality that make up the front-end
Allows testing the bahovior of a server-side code


Since it is a complete testing system that can test any type of JavaScript code, it can test server-side behaviour and components as well


Unitils provides support for testing the back-end through modules such as DbUnit which specifically tests your database, i.e connections setup and so on
Allows defining a fixed, specific states of data (fixtures) that are test-local. This ensures specific environment for a single test


Group fixtures
Allows defining a fixed, specific states of data for a group of tests (group-fixtures). This ensures specific environment for a given group of tests.


Supports data generators for tests. Data generators generate input data for test. The test is then run for each input data produced in this way.

Licence type governing the use and redistribution of the software

FreeBSD License

Mocks are objects that simulate the behavior of real objects. Using mocks allows testing some part of the code in isolation (with other parts mocked when needed)

Intern uses the Dojo Toolkit’s AMD loader. To mock, you should be able to just use the standard AMD 'map' feature, else you can use third party libraries like sinon.js

Allows organizing tests in groups


You can group tests into Suites which may be specified as file paths or using glob expressions, there is typically one top-level suite per module.

Other useful information about the testing framework