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Software Testing Using Node.js

Software Testing Using Node.js

Software testing is very important – without it, bugs sneak into the wild where they’re more difficult and expensive to fix. Automating testing can significantly increase test coverage and also reduce long-term costs. During this blog post, we’ll see how we will perform testing using Node.js as JavaScript is a widely used language in today’s world.

Which Framework Should I Use to Test my Node.js Application?

There are various frameworks available for testing a Node.Js application, each having its advantages and disadvantages. Here is the list:

1. Mocha

Mocha is a test framework of Javascript for Node.js programs. It is highly used for asynchronous testing. It’s a superb framework that permits asynchronous/await with TypeScript or Babel. It is designed with the mindset to test both synchronous and asynchronous code. It is a feature-rich JavaScript test framework running on Node.js and within the browser. It provides a set of functions that execute in particular order & logs the result on the terminal. Mocha features a CLI that we mention below and is filled with helpful features. Mocha is one of the foremost popular NodeJS testing frameworks.

Installation:

npm install mocha -g# project install
npm install mocha --save-dev

2. Chai

Chai is a commonly used JavaScript testing framework to write Unit tests. It allows you to use natural language constructs when developing your tests.

Installation:

npm install --save-dev chai

3. Mockery

Mockery gives you an easy-to-use API with which you’ll hook in your mocks without having to get your hands dirty with the specified cache or other Node implementation details. Mockery isn’t a mocking framework. It allows you to work more easily together with your framework of choice (or no framework) to hook your mocks into all the proper places within the code you would like to check.

Installation:

npm install mockery

How to use Mocha for testing:

  1. Install Mocha using the above code.
  2. Create a root directory for the example app.
  3. Create a test file example.app.js under the root directory.
  4. Paste the below code snippet:
//import assert
const assert = require('assert'); 
describe('My First Test', () => { 
   it('should return 4', () => { 
      assert.equal(2 + 2, 4); }); 
   it('should return 16', () => { 
      assert.equal(4 * 4, 16); 
   }); 
});

Here is the meaning of several terms used in the above code:

  1. describe — collection or bundle of tests. Here, its name is “My First Test”

Update package.json

"scripts": {"test": "mocha"}

Save all the changes & run it.

Run test:

npm run test

All test should pass 😊

How to use Chai for testing:

  1. Install chai
  2. Create a root directory for the example app.
  3. Create a test file example.app.js under the root directory.
  4. Paste the below code snippet
//import chai
const expect = require('chai').expect; 
describe('My First Test', () => {
   it('should return 4', () => { 
      expect(2 + 2).to.equal(4); }); 
   it('should return 16', () => { 
      expect(4 * 4).to.equal(16); 
   }); 
});

Save all the changes & run it.

Run test:

npm run test

All test should pass ✅

I hope this article helped you understand the basic overview of Software Testing using Node.js. Thanks for reading 🤓

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About the author

Shivam Varshney

SDE 2+ years of experience in the field of Software Developing. An Energetic and highly motivated individual, who is always curious about gaining knowledge and adding new skills to his skills set. His eventual goal is to be a good human being and make himself able to help those in need. My focus is on Software Quality and making sure that Software is Bug free. I enjoy to work in team and learning from others, across all areas of business and technologies.I love to share my knowledge and discuss Software Testing related topics.

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