How do I test Node.js modules effectively?

How do I test Node.js modules effectively?

To test Node.js modules effectively, you can use testing frameworks like Mocha or Jest. Do you have a specific framework in mind?

I was thinking about using Jest. What are the steps to set it up?

To set up Jest, first install it using npm: npm install --save-dev jest. Then, add a test script in your package.json: "test": "jest". Would you like to know how to write a test?

Yes, please show me an example of a simple test.

Sure! Here's a simple test example:

const sum = require('./sum');

test('adds 1 + 2 to equal 3', () => {
  expect(sum(1, 2)).toBe(3);
});

This tests a sum function. Do you need help with anything else?