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What is Assertion Testing in Node.js?

• The Node.js Assert is the most elementary way to write tests.It provides no feedback when running your test unless one fails.The assert module provides a simple set of assertion tests that can be used to test in variants.
• The module is intended for internal use by Node.js, but can be used in application code via require ('assert').
• However, assert is not a testing framework and cannot be used as general purpose assertion library.

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Node.js Assert Example:

Let's see a simple example of Node.js Assert.

Node JS Tutorial File: assert_example1.js

var assert = require('assert');  
function add (a, b) {  
  return a + b;  
}  
var expected = add(1,2);  
assert( expected === 3, 'one plus two is three');  

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It will not provide any output because the case is true. If you want to see output, you need to make the test fail.

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Node JS Tutorial File: assert_example2.js

var assert = require('assert');  
function add (a, b) {  
  return a + b;  
}  
var expected = add(1,2);  
assert( expected === 4, 'one plus two is three');  

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Now you will see the Assertion Error .

Output:

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