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What is the use of Chai when we are automating using JavaScript for NodeJS applications

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Chai is an assertion library which is used by automation testing services providers for JavaScript automation solutions of NodeJS applications. 

Mostly, Chai is used with combination of Mocha. Here Mocha is used as a testing framework and Chai is used as a Asserting library for the same. 

Chai package can be installed using below command: 

npm install mocha chai

Chai library can be imported using below syntax:

var chai = require('chai').expect;

For Example: 

it('Main Fun',function(){

    request('', function(err, res){





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