how to test code in javascript – Code Example

In order to test code in javascript, we can use assert() method. It works in the same way as the testing in any other programming language. In this article we will show you the code to get you ready for it.

Code Example –

const errorMsg = 'the # is not even';

for (let number = 2; number <= 5; number += 1) {
    console.log(`the # is ${number}`);
    console.assert(number % 2 === 0, {number: number, errorMsg: errorMsg});
}


// output:
// the # is 2
// the # is 3
// Assertion failed: {number: 3, errorMsg: "the # is not even"}
// the # is 4
// the # is 5
// Assertion failed: {number: 5, errorMsg: "the # is not even"}

Source: MDN