How do I test modules in JavaScript?

How do I test modules in JavaScript?

You can test JavaScript modules using frameworks like Jest or Mocha. Would you like a quick setup guide?

Yes, please provide a setup guide for Jest.

First, install Jest using npm: npm install --save-dev jest. Then, add a test script in your package.json: "test": "jest". You can create a __tests__ folder for your test files.

What should I include in my test files?

In your test files, you can use describe to group tests and it to define individual tests. Use assertions like expect to check outcomes.

Can you give me an example of a test case?

Sure! Here's a simple test case:

const sum = (a, b) => a + b;

describe('sum function', () => {
  it('adds two numbers', () => {
    expect(sum(1, 2)).toBe(3);
  });
});