How can I use Mocha and Chai for testing my JavaScript code?

How can I use Mocha and Chai for testing my JavaScript code?

You can use Mocha as a test framework and Chai as an assertion library. First, install them using npm.

What are the basic steps to set them up?

1. Install Mocha and Chai: npm install --save-dev mocha chai. 2. Create a test directory and add your test files.

Can you show me a simple test example?

Sure! Here's a simple test:

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

describe('Array', function() {
  describe('#indexOf()', function() {
    it('should return -1 when the value is not present', function() {
      expect([1, 2, 3].indexOf(4)).to.equal(-1);
    });
  });
});

How do I run the tests once they're written?

You can run your tests by executing npx mocha in your terminal. Make sure you're in the project directory.